To see the other types of publications on this topic, follow the link: Miliolida.
Journal articles on the topic 'Miliolida'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Miliolida.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Capotondi, Lucilla, Michael A. Kaminski, and Nicoletta Mancin. "The test wall of ?Nubeculina Cushman 1924 (Miliolida): updates on its agglutinated-porcelaneous wall structure from entire and sectioned specimens." Micropaleontology 68, no. 6 (2022): 557–67. http://dx.doi.org/10.47894/mpal.68.6.02.
Full textAbstract:
There is a growing number of new foraminifera with agglutinated wall types held together by secreted crystallites of high-magnesium calcite that do not fit within the traditional definition of the Miliolida. In this study, we analyzed entire and sectioned foraminiferal specimens frommodern marine sediments collected off the Croatian coast (Adriatic Sea) using an Environmental Scanning Electron Microscope (ESEM) equipped with Energy-Dispersive x-ray-Spectroscopy (EDS). The investigated specimens resemble the miliolid genera Nubeculina Cushman 1924 and Falsonubeculina Amao and Kaminski 2019, but display characteristics of testmorphology and an agglutinated-porcelaneous wall structure that have not been previously observed in similar miliolids. Their wall structure is more like that observed in primitive agglutinated foraminifera such as Lagenammina rather than in true miliolids. New taxonomical inferences regarding the nubeculinid group of genera are discussed.
2
Billups, Katharina, Patrícia Pinheiro Beck Eichler, Christina Ravelo, Luzia Liniane do Nascimento, Helenice Vital, and Moab Praxedes Gomes. "Stable Isotopic Variability in Individual Benthic Foraminifera from the Continental Shelf of Tropical Brazil." Journal of Foraminiferal Research 52, no. 4 (2022): 212–28. http://dx.doi.org/10.2113/gsjfr.52.4.212.
Full textAbstract:
ABSTRACT We analyzed nine benthic foraminiferal species from the Açu Reef belonging to the orders Rotaliida and Miliolida, symbiont-bearing (Rotaliida: Amphistegina gibbosa, Heterostegina depressa; Miliolida: Peneroplis carinatus, Archaias angulatus, Amphisorus hemprichii, and Archaias compressus) and symbiont-barren (Rotaliida: Buccella peruviana, Pseudononion atlanticum; Miliolida: Quinqueloculina lamarckiana). Stable isotopes measured on individual tests display a large intraspecific variability (δ18O: ∼1–1.5‰; δ13C: ∼2–3.5‰) that is not associated with site location, sampling season, or water depth. Positive correlation between δ13C and δ18O values is significant in three of the species (A. gibbosa, B. peruviana, and Q. lamarckiana), with a regression slope similar to other marine calcifiers (∼2‰ δ13C/‰ δ18O), perhaps related to the carbonate chemistry of the calcifying fluid. With the exception of A. gibbosa, offsets from δ18O equilibrium, when distinct, tend to be positive. Offsets from δ13C of ΣCO2 of sea water are negative for two of the rotaliids (A. gibbosa and H. depressa) and positive for three of the miliolids (P. carinatus, A. angulatus, A. hemprichii), with non-symbiont-bearing species of both orders being close to the sea water values (∼ 1.3–2‰). These δ13C differences are consistent with calcification pathways of rotaliids versus miliolids, with the former drawing carbon from an internal pool and the latter from ambient seawater. Our study contributes a large data set that illustrates the importance of vital and abiotic effects on the stable isotopic composition of large benthic foraminifera in a tropical continental shelf, limiting their applicability as paleoenvironmental tracers.
3
Михалевич, В. И. "Наблюдения за представителями отряда Miliolida (Miliolata, Foraminifera) в лабораторных условиях. 2.Miliolinasp." Зоологический журнал 95, № 8 (2016): 897–904. http://dx.doi.org/10.7868/s0044513416080109.
Full text
4
Михалевич, В. И. "Наблюдения за представителями отряда Miliolida (Miliolata, Foraminifera) в лабораторных условиях. 1. ВидMassilina secans(d’orbigny) 1826". Зоологический журнал 95, № 7 (2016): 769–78. http://dx.doi.org/10.7868/s0044513416070072.
Full text
5
Amao, Abduljamiu O., and Michael A. Kaminski. "Pseudonubeculina arabica n. gen. n. sp., a new Holocene benthic foraminifera from the Arabian Gulf." Micropaleontology 62, no. 1 (2016): 81–86. http://dx.doi.org/10.47894/mpal.62.1.03.
Full textAbstract:
This paper describes an enigmatic new agglutinated benthic foraminiferal genus and species that shares some morphological features with the Reophax, Hormosina and Nubeculina groups. Pseudonubeculina arabica n.gen. n.sp. is characterized by its uniserial chamber arrangement, coarsely agglutinated bilamellar test wall with white high-Mg calcite cement, and a terminal slit-like aperture formed by the flat sides of two or more large agglutinated grains. The new genus cannot be placed within any of the previously described families of the Miliolida. The current classification of the Miliolida does not accommodate a genus with a wholly uniserial chamber arrangement. This species can easily be distinguished by its prominent terminal slit-like aperture, formed using the flat sides of two or more large agglutinated grains, lined by an imperforate rim of secreted calcite. The species has a restricted area and depth distribution in the Arabian Gulf.
6
Zamora-Duran, M. Angelica, Richard B. Aronson, James J. Leichter, Jennifer A. Flannery, Julie N. Richey, and Lauren T. Toth. "Imprint of Regional Oceanography on Foraminifera of Eastern Pacific Coral Reefs." Journal of Foraminiferal Research 50, no. 3 (2020): 279–90. http://dx.doi.org/10.2113/gsjfr.50.3.279.
Full textAbstract:
ABSTRACT The marginal marine environments of the eastern tropical Pacific (ETP) serve as an ideal natural laboratory to study how oceanographic and climatic variability influence coral-reef ecosystems. Reefs along the Pacific coast of Panamá span a natural gradient of nutrients, pH, and temperature as a result of stronger seasonal upwelling in the Gulf of Panamá relative to the Gulf of Chiriquí. The ecosystems are not only influenced by spatial and seasonal variations in oceanography but are affected by the climatic variability of the El Niño-Southern Oscillation (ENSO). Foraminifera can be robust indicators of ecosystem condition because the composition of their assemblages and the geochemistry of their tests can change rapidly in response to environmental variability. We studied benthic foraminifera in sediment samples collected from 3 m below mean sea level in the Gulf of Panamá and the Gulf of Chiriquí. Temperature loggers deployed from 2016 to 2019 showed that average temperatures were lower and more variable in the Gulf of Panamá due to seasonal upwelling. All sites in both gulfs were dominated by heterotrophic foraminifera, which was likely the result of nutrient enrichment due to upwelling, combined with ENSO effects. However, the Gulf of Chiriquí was characterized by higher abundances of symbiont-bearing foraminifera than the Gulf of Panamá. The orders Miliolida and Rotaliida dominated the foraminiferal assemblages in both gulfs, with Quinqueloculina and Rosalina being the most abundant genera in the two orders, respectively. Miliolids were less abundant in the Gulf of Panamá than in the Gulf of Chiriquí, whereas rotaliid densities were not significantly different between the two gulfs. Lower pH in the Gulf of Panamá as a result of upwelling may have contributed to the lower abundance of miliolids, which secrete tests of high-magnesium calcite. Geochemical analysis of tests of the symbiont-bearing miliolid Sorites marginalis revealed that foraminiferal Mg/Ca ratios were lower in the Gulf of Panamá than in the Gulf of Chiriquí. The offset in foraminiferal Mg/Ca is consistent with the lower mean annual temperature observed in the Gulf of Panamá due to stronger seasonal upwelling. Because the geochemistry and assemblages of foraminifera reflect differences in environmental conditions, they could potentially be used in tandem with coral proxies to reconstruct past environmental change and project the future of coral-reef systems within the ETP.
7
Garrison, Thomas F. "The microscopic mineral collector of the sea: Agglutinella kaminskii n. sp., a new benthic foraminifer from the Arabian Gulf." Micropaleontology 65, no. 4 (2019): 277–83. http://dx.doi.org/10.47894/mpal.65.4.01.
Full textAbstract:
The new species Agglutinella kaminskii n. sp. (Miliolida: Siphonapertinae) is described from nearshore marine localities in eastern Bahrain. The species is characterized by its simple tooth and tendency for selectively incorporating colorful siliciclastic mineral grains of eolian origin into its test wall. The new species appears to be endemic to the Arabian Gulf.
8
Lyu, Man, Yanli Lei, and Tiegang Li. "Comparison of Different Dna Preservation Methods On Quinqueloculina Spp. (foraminifera, Miliolida)." Journal of Foraminiferal Research 48, no. 3 (2018): 186–92. http://dx.doi.org/10.2113/gsjfr.48.3.186.
Full textAbstract:
Abstract We carried out a series of experiments to evaluate the efficiency of preserving DNA from porcelaneous foraminifera (Quinqueloculina spp.) and a second set to assess the effect of Rose Bengal staining on molecular processing. The first experimental setup assessed three methods of DNA preservation (air-drying, freezing with or without seawater, and Guanidine lysis buffer treatment with or without EDTA (Ethylenediaminetetraacetic acid)). Our study produced the following results: 1) there were no significant differences in DNA preservation when samples were air dried across a range of temperatures (20–120°C); samples frozen at −20°C appeared better preserved than at those frozen at –80°C, and freezing without seawater appeared to produce better preservation than with seawater, though differences in freezing treatments were not significant (p > 0.05); samples in Guanidine lysis buffer with EDTA and stored at –20°C were well preserved (p < 0.05); 2) sometimes, DNA was successfully extracted from samples stained with Rose Bengal. We recommend Guanidine lysis buffer with EDTA, stored at –20°C for up to six weeks, as the best protocol for preservation of DNA from porcelaneous foraminifera.
9
Carvajal-Chitty, Humberto, and Sandra Navarro. "Preliminary foraminiferal survey in Chichiriviche de La Costa, Vargas, Venezuela." Revista Brasileira de Paleontologia 24, no. 2 (2021): 90–103. http://dx.doi.org/10.4072/rbp.2021.2.02.
Full textAbstract:
A preliminary study of the composition and community structure of the foraminifera of Chichiriviche de La Costa (Vargas, Venezuela) is presented. A total of 105 species were found in samples from 10 to 40 meter-depth, and their abundance quantified in a carbonate prone area almost pristine in environmental conditions. The general composition varies in all the samples: at 10 m, Miliolida dominates the assemblages but, as it gets deeper, Rotaliida takes control of the general composition. The Shannon Wiener diversity index follows species richness along the depth profile, meanwhile the FORAM index has a higher value at 20 m and its lowest at 40 m. Variations in the P/(P+B) ratio and high number of rare species are documented and a correspondence multivariate analysis was performed in order to visualize the general community structure. These results could set some basic information that will be useful for management programs associated with the coral reef in Chichiriviche de La Costa, which is the principal focus for diver’s schools and tourism and could help the local communities to a better understanding of their ecosystem values at this location at Vargas State, Venezuela. Keywords: Miliolida, Rotaliida, foraminiferal assemblages, FORAM index, Caribbean continental shelf.
10
Mikhalevich, Valeria I. "Comparison between the test and wall structure of the Miliolata and Fusulinoida (Foraminifera), based on new data from Antarctic miliolids." Micropaleontology 55, no. 1 (2009): 1–21. http://dx.doi.org/10.47894/mpal.55.1.01.
Full textAbstract:
The morphological similarities of the outer and inner test structure of primitive and advanced Fusulinoida (Tournayellida, Endothyrida, Fusulinida) and primitive and advanced Miliolata (Baisalinidae, Ophthalmidiidae, Miliolidae, Alveolinina, Soritinida) have been traditionally viewed as a result of convergent evolution.Adetailed comparison of the test and apertural shape, of the inner supplementary deposits of the test material (mounds, nodes, spine like projections, nodosities and teeth and flaps in the thin sections) of the both taxonomic groups studied, as well as the comparison of the fusulinacean wall with newly discovered unique ultrastructural features of the porcelaneous wall of large Antarctic miliolids (along with the highmagnesium level in the both calcareous groups) lead us to an understanding of their close relationship. Both groups represent two smaller branches of one phylogenetic lineage and hence the similarity of the outer and inner structures of their shells could be considered as parallelism in the closely related groups.
11
Dubicka, Zofia, Krzysztof Owocki, and Michał Gloc. "Micro- and Nanostructures of Calcareous Foraminiferal Tests: Insight from Representatives of Miliolida, Rotaliida and Lagenida." Journal of Foraminiferal Research 48, no. 2 (2018): 142–55. http://dx.doi.org/10.2113/gsjfr.48.2.142.
Full textAbstract:
Abstract The test structures of Lagenida, Rotaliida, and Miliolida (Foraminifera) are described at an unprecedented scale of resolution. Observations using conventional and field-emission scanning electron microscopy revealed distinct micro- and nanoscale differences in the textural compositions of these three main groups of calcifying foraminifers, consistent with recent molecular phylogenetic reconstructions and a higher-level taxonomic system. The rotaliid test is entirely composed of roughly spherical primary carbonate nanograins, up to 100 nm in diameter, which merge into micrometer-sized irregular aggregates. The miliolid test is made up of two morphologically different primary crystallites. Arbitrarily arranged needle-shaped elements (up to 1 µm in length and 200 nm in width) make up the bulk of the test, including the inside of the wall (porcelain) and mineralized inner surface (intrados) (ca. 100 nm in thickness). Roughly spherical nanograins (up to 50 nm in diameter) form more or less regularly arranged polygons of an outer lamina (extrados), which is ca. 200 nm in thickness. By contrast, the lagenid test texture is characterized by much larger crystals than in other calcifying foraminifers. At moderate magnification, lagenid tests display a fibrous texture composed of fiber bundles (tens of μm in length and several μm in width) that are oriented perpendicular to test surfaces and taper towards the ends when in contact with another lamina. At higher magnification, each bundle constitutes a single calcite crystal with an inner pore extending along the entire length of the crystal/fiber. We measured test hardness using the nanoindentation method. This is the first application of this technique in microfossils. We found that Cretaceous Lagenida tests were more resistant to mechanical stress than Rotaliida tests. These comparative strengths may be linked to internal test microstructure and play a role in determining habitats in which these taxa can live.
12
Dumitriu, Simina Dumitriţa, Zofia Dubicka, and Viorel Ionesi. "The functional significance of the spinose keel structure of benthic foraminifera: inferences from <i>Miliolina cristata</i> Millett, 1898 (Miliolida) from northeast Romania." Journal of Micropalaeontology 37, no. 1 (2018): 153–66. http://dx.doi.org/10.5194/jm-37-153-2018.
Full textAbstract:
Abstract. The paper presents Miocene (lower Sarmatian) benthic foraminifera from the FH3P1 Rădăuţi Core section from the northwestern part of the Moldavian Platform, Romania. Based on foraminiferal assemblages we infer sediments were deposited in shallow-water, including marine-marginal environments, of varying salinities from brackish to normal marine with some short and rather small sea-level changes. Moreover, we describe for the first time in the Moldavian Platform a very rare species, Miliolina cristata Millett, which presents a characteristic spinose keel. Based on a detailed study of the test morphology and its variability, observed in picked material as well as in thin sections, we discuss some palaeoecological aspects of these foraminifera. M. cristata probably does not constitute a distinctive species, but it is more probable that some miliolid taxa developed such an exoskeletal feature in response to new environmental conditions, such as more turbulent water. Accordingly, our study would support the thesis that one of the functions of the benthic foraminiferal spines is to stabilize foraminiferal tests found in sandy substrates from high-energy environments.
13
Ganapati Ramesh Naik, Manisha Nitin Kulkarni, and Madhavi Manohar Indap. "Recent Foraminifera from the coast of Mumbai, India: distribution and ecology." Journal of Threatened Taxa 15, no. 4 (2023): 23101–13. http://dx.doi.org/10.11609/jott.7813.15.4.23101-23113.
Full textAbstract:
Foraminifera have been used in biostratigraphy and paleoenvironmental research. They are useful environmental indicators for monitoring the marine environment. Intertidal sediment samples were analysed for their diversity in relation to physicochemical parameters and sediment characteristics along the Mumbai coast of India. Thirty-five species were found, divided into five orders and 18 families. The orders Rotaliida and Miliolida were identified to be dominant. Foraminifera were observed to be inversely related to sand particle size in relation to sediment and physicochemical parameters of water. Canonical correlation analysis explained the relationship between species abundance and water physicochemical parameters.
14
Kamble, Suren N., Mohan A. Sonar, and Kamlakar M. Wanjarwadkar. "Benthic Foraminifera from the Lower Miocene Sediments of Murachbann, Western Kachchh, Gujarat, India: Implications for Inferring Palaeoenvironment." Journal of Geosciences Research 9, no. 1 (2024): 49–53. http://dx.doi.org/10.56153/g19088-023-0172-47.
Full textAbstract:
A thorough taxonomic study was carried out for the first time using high-resolution microscopy from Neogene sections of western Kachchh, India. In the present study, 25 species of benthic foraminifera belonging to 3 classes viz. Globothalamea, Tubothalamea, Nodosariata and 4 orders Rotaliida, Textulariida, Miliolida and Polytmorphinida have been identified from limestone and silty-claystone of Murachbann section belonging to lower Miocene. This taxonomic study provides the distribution of benthic foraminifera species from Murachbann section. The attempt is made to interpret depositional palaeoenvironment based on this distribution of the studied foraminifera. Keywords: Morphology, Taxonomy, Benthic Foraminifera, Limestone, Palaeoenvironment, Chhasra Formation
15
Clemens, S. C., K. Thirumalai, and D. Oppo. "Indian margin methane hydrate dissociation recorded in the carbon isotopes of benthic (Miliolida) foraminifera." Earth and Planetary Science Letters 609 (May 2023): 118101. http://dx.doi.org/10.1016/j.epsl.2023.118101.
Full text
16
Maisuradze, Lamara, Kakhaber Koiava, and Silvia Spezzaferri. "Taxonomic revision and new species/subspecies of Middle-Late Miocene (Bessarabian) miliolids of the Family Hauerinidae Schwager from Georgia — Eastern Paratethys." Geologica Carpathica 60, no. 5 (2009): 419–30. http://dx.doi.org/10.2478/v10096-009-0030-3.
Full textAbstract:
Taxonomic revision and new species/subspecies of Middle-Late Miocene (Bessarabian) miliolids of the Family Hauerinidae Schwager from Georgia — Eastern ParatethysThree new miliolid taxa from Bessarabian sediments from Georgia (Eastern Paratethys) are described following the classification of Łuczkowska (1972), which has never been used before by ex-Soviet micropaleontologists. They are:Varidentella luczkowskae; Varidentella reussi(Bogdanowicz) subsp.costulata; andAffinetrina voloshinovae(Bogdanowicz) subsp.eldarica.This classification takes into account the morphology of the aperture and the shape and size of teeth as criteria to distinguish the species. This study contributes important criteria which will help to unify the taxonomical inconsistencies between the Eastern, Central and Western Paratethyan miliolids.
17
Parker, Justin H. "Ultrastructure of the Test Wall in Modern Porcelaneous Foraminifera: Implications For the Classification of the Miliolida." Journal of Foraminiferal Research 47, no. 2 (2017): 136–74. http://dx.doi.org/10.2113/gsjfr.47.2.136.
Full textAbstract:
Abstract New insight into wall ultrastructure has been gained from examination of 130 species of porcelaneous foraminifera. New terms are introduced to describe the porcelaneous wall, including: “porcelain” for the main body of the wall that is comprised of a matrix of randomly oriented needle-shaped crystals; “intrados” for the inner mineralised surface; and “extrados” for the outer mineralised surface. The main test wall may also contain aligned needle-shaped crystals, which form an “infraskeletal framework” where parallel to the test wall, and “infraskeletal windows” where perpendicular to the wall surface. The intrados is constructed of needle-shaped crystals oriented randomly on a plane parallel to the inner surface of the chamber. Its structure is relatively consistent across all studied species and does not change during ontogeny. The porcelain is the fundamental part of the wall that determines appearance (e.g., carinate, costate, striate and pitted ornament). It is primarily constructed of a matrix of randomly oriented needle-shaped crystals, which in some species have embedded sediment particles, and in Pseudohauerina is perforated by a canaliculate network. Within the porcelain in soritid and peneroplid taxa, an infraskeletal framework occurs in chamber and chamberlet walls that forms the basis of the chamber around which the randomly-oriented crystals of the porcelain are placed. In Alveolinella and Borelis the porcelain of lateral chamber walls contains crystals aligned perpendicular to the chambers that form infraskeletal windows, which likely assist in light transmission into the test. The extrados in the studied taxa is constructed of needle-, rod- or plate-shaped crystals that may be aligned or non-aligned. At the genus level there is typically consistency in the structure of the extrados, however in Quinqueloculina and Triloculina variation between species is observed. Examination of wall ultrastructure is a useful character to help understand attempts to split these genera, and more broadly to better understand the phylogenetic links between taxa.
18
Lee, Somin, Fabrizio Frontalini, and Wonchoel Lee. "A Brief Report of Five Newly Recorded Korean Modern Benthic Foraminiferal Species." Taxonomy 1, no. 4 (2021): 438–47. http://dx.doi.org/10.3390/taxonomy1040031.
Full textAbstract:
The present study describes five newly recorded modern benthic foraminiferal species from the subtidal zone near Jeju Island and East China Sea (Korea). The newly recorded species (Karrerulina conversa, Rotaliammina trumbulli, Vertebralina striata, Pegidia dubia and Amphistegina radiata) belong to five families (Prolixoplectidae, Trochamminidae, Fischerinidae, Pegidiidae and Amphisteginidae), three orders (Lituolida, Miliolida and Rotaliida) and two classes (Globothalamea and Tubothalamea). All these five genera (Karrerulina, Rotaliammina, Vertebralina, Pegidia and Amphistegina) were also reported for the first time from Korean waters. Most of the examined specimens were highly consistent morphologically with previous records from southern China and Japan. Additionally, Amphistegina is one of the symbiont-bearing larger benthic foraminifera, known to be mainly distributed in tropical to warm subtropical waters. This study contributes to the expansion of data on the recent foraminiferal species diversity in Korean waters.
19
Macher, Jan-Niklas, Martina Prazeres, Sarah Taudien, Jamaluddin Jompa, Aleksey Sadekov, and Willem Renema. "Integrating morphology and metagenomics to understand taxonomic variability of Amphisorus (Foraminifera, Miliolida) from Western Australia and Indonesia." PLOS ONE 16, no. 1 (2021): e0244616. http://dx.doi.org/10.1371/journal.pone.0244616.
Full textAbstract:
Foraminifera are a group of mostly marine protists with high taxonomic diversity. Species identification is often complex, as both morphological and molecular approaches can be challenging due to a lack of unique characters and reference sequences. An integrative approach combining state of the art morphological and molecular tools is therefore promising. In this study, we analysed large benthic Foraminifera of the genus Amphisorus from Western Australia and Indonesia. Based on previous findings on high morphological variability observed in the Soritidae and the discontinuous distribution of Amphisorus along the coast of western Australia, we expected to find multiple morphologically and genetically unique Amphisorus types. In order to gain detailed insights into the diversity of Amphisorus, we applied micro CT scanning and shotgun metagenomic sequencing. We identified four distinct morphotypes of Amphisorus, two each in Australia and Indonesia, and showed that each morphotype is a distinct genotype. Furthermore, metagenomics revealed the presence of three dinoflagellate symbiont clades. The most common symbiont was Fugacium Fr5, and we could show that its genotypes were mostly specific to Amphisorus morphotypes. Finally, we assembled the microbial taxa associated with the two Western Australian morphotypes, and analysed their microbial community composition. Even though each Amphisorus morphotype harboured distinct bacterial communities, sampling location had a stronger influence on bacterial community composition, and we infer that the prokaryotic community is primarily shaped by the microhabitat rather than host identity. The integrated approach combining analyses of host morphology and genetics, dinoflagellate symbionts, and associated microbes leads to the conclusion that we identified distinct, yet undescribed taxa of Amphisorus. We argue that the combination of morphological and molecular methods provides unprecedented insights into the diversity of foraminifera, which paves the way for a deeper understanding of their biodiversity, and facilitates future taxonomic and ecological work.
20
Forderer, Meena, and Martin R. Langer. "Atlas of benthic foraminifera from coral reefs of the Raja Ampat Archipelago (Irian Jaya, Indonesia)." Micropaleontology 64, no. 1-2 (2018): 1–170. http://dx.doi.org/10.47894/mpal.64.1.01.
Full textAbstract:
Raja Ampat (Indonesia) is a remote archipelago west of Papua mainland and situated at the eastern edge of the Coral Triangle. The archipelago is considered one of the species-richest and most pristine localities and home to the world’s most diverse coral reefs. For centuries, reefs of Raja Ampat have enjoyed natural protection and remained largely untouched due to their isolated location. The region represents a key area for evaluating richness and biogeographic patterns of tropical shallow-water organisms, yet the foraminiferal fauna of Raja Ampat is virtually unexplored. Benthic foraminifera are an integral part of the reef fauna, prolific carbonate producers and essential for reefal accretion and substrate stability. Previous studies on Indo-Pacific benthic reef foraminifera indicate that diversity is highest in the Central Indo-Pacific and broadly correlates with diversity patterns of other tropical marine taxa. This report presents the first illustrated catalog and comprehensive analysis of the structure, composition, and diversity of the species-rich benthic foraminiferal biotas of the Raja Ampat Archipelago including an assessment of local reef vitality with the Foraminifera in Reef Assessment and Monitoring (FoRAM) Index. We examined shallow-water sediment samples from fringing reefs, reef platforms, sheltered bays and reef-associated environments to cover the full range of existing micro- and macrohabitats. Atotal number of 421 species were recovered, among them five new species and one newly described genus of the porcelaneous Miliolida. The fauna is dominated by hyaline taxa but the Miliolida represent the species-richest order and are especially diverse in fine-grained sediments of deep fore-reef slopes. Extraordinary high diversity of the benthic foraminiferal communities indicates that the waters of Raja Ampat probably represent one of the world’s biologically richest locations in reefs.We identified a total of 35 species of larger symbiont-bearing benthic foraminifera, a number that is among the highest reported so far for reefs in modern oceans. The analysis of the FoRAM Index revealed that water quality at all sites examined is suitable for reef growth and recovery. The results of our study show that the Raja Ampat Archipelago harbors unique and particularly diverse assemblages of modern benthic foraminifera and provides a protistan perspective for the hotspot of diversity in the Central Indo-Pacific.
21
Chitty, Humberto Carvajal. "Richness in recent foraminifera from different locations along Venezuelan coastal ecosystems." Micropaleontology 66, no. 2 (2020): 143–50. http://dx.doi.org/10.47894/mpal.66.2.05.
Full textAbstract:
The total number of recent foraminifera species for Venezuelan marine areas is counted and summarized by major taxonomic groups. Samples from different locations associated with contrasting marine settings were used to review the species richness of the foraminiferal community. Atotal of 930 species were compiled and their synonyms updated. Of this total, 392 species belong to the Rotaliida (42%), 234 to theMiliolida (25%), 155 to the Textulairida (17%), and 79 species to the Lagenida (8%), while the Nodosairida has 18 species (2%), the Spirilinida has 17 (2%), the Polymorphinida has 14 (2%), and the rest belong to the Vaginulinida, Robertinida, Carterinida and Involutinida (12, 6, 2 and 1 species each, respectively). Atotal of 271 species have been identified as endemic to theVenezuelan marine coastal area. This basic diversity analysis of species indicates that the Rotaliida dominate the foraminiferal assemblages along the coast line, followed by the Miliolida and Textulariida, with minor representation of other groups of foraminifera. The distribution of the foraminiferal species, especially benthic, is associated with the different ecoregions and can help serve as indicators for environmental health, marine restoration, and preservation of environmental quality.
22
Putri, Amalia Kurnia, Sayu Kadek Dwi Dani, Endang L. Widiastuti, Kresna T. Dewi, and Sri Murwani. "STRUKTUR KOMUNITAS FORAMINIFERA BENTIK DAN HUBUNGANNYA DENGAN KEMELIMPAHAN PLANKTON TERHADAP TERUMBU KARANG DI GOSONG SUSUTAN DAN PASIR TIMBUL, TELUK LAMPUNG." Jurnal Ilmiah Biologi Eksperimen dan Keanekaragaman Hayati 4, no. 1 (2017): 47–56. http://dx.doi.org/10.23960/jbekh.v4i1.125.
Full textAbstract:
Penelitian ini dilaksanakan pada 01 Agustus sampai 21 Oktober 2016 di Laboratorium Petrologi dan Mineralogi Pusat Penelitian dan Pengembangan Geologi Kelautan (P3GL) Bandung. Sampel yang digunakan berasal dari Pasir Timbul dan Gosong Susutan, Teluk Lampung. Sampel sedimen berjumlah 32 set yang diambil pada 4 titik stasiun dan 2 kali pengambilan yaitu disekitar tepian, pada kedalaman 5m, pada daerah terumbu karang kedalaman 7 dan 15 meter, sampel plankton diambil pada 0 meter, 7 meter, dan 15 meter dengan tiga kali pengambilan. Identifikasi foraminifera menggunakan buku acuan Barker (1960) dan Loebich dan Tappan (1994). Hasil penelitian ini didapat 5 bangsa yang ditemukan, yaitu Rotaliida, Textulariida, Miliolida, Robertinida, dan Lagenida. Sebanyak 52 jenis berhasil diidentifikasi dengan Amphistegina lessonii yang paling melimpah sebagai foraminifera penciri terumbu karang. Analisis data menggunakan PAST version 2.09 diketahui kisaran nilai indeks keanekaragaman 0,57-2,21, nilai indeks keseragaman 0,24-0,65, dan nilai indeks dominansi 0,15-0,76. Nilai korelasi 0,53 – 0,87 menunjukkan adanya hubungan antara foraminifera dan kemelimpahan plankton terhadap pertumbuhan terumbu karang di perairan Gosong Susutan, Lampung. FORAM Index (FI) digunakan sebagai bioindikator kualitas perairan terhadap terumbu karang, nilai FI yang tinggi menunjukkan lokasi tersebut baik dan cocok untuk pertumbuhan terumbu karang, 5,04 untuk nilai terendah dan 9,02 untuk nilai tertinggi.
23
Dubicka, Zofia, Maria Gajewska, Wojciech Kozłowski, and Valeria Mikhalevich. "Test structure in some pioneer multichambered Paleozoic foraminifera." Proceedings of the National Academy of Sciences 118, no. 26 (2021): e2100656118. http://dx.doi.org/10.1073/pnas.2100656118.
Full textAbstract:
Foraminiferal wall microstructures, consistent with the molecular-based high-rank classification, are critical to understanding foraminiferal evolution and advanced taxonomic relationships. Although test structures are well documented for recent, Cenozoic, and some Mesozoic foraminifera, the diagnostic characteristics of Paleozoic taxa are largely unexplored. The majority of calcareous Paleozoic foraminifera have been assigned to the Fusulinata based on questionable homogeneously “microgranular” test wall microstructures, which have never been sufficiently documented for most taxa. We investigated the test structures of exceptionally well-preserved Devonian (Eifelian) Semitextularia thomasi, representing the first calcareous true multichambered (serial) foraminifera, and compared this species with a large fusiform Permian representative of “true” fusulinids (Neoschwagerinidae). The tests of Semitextularia thomasi display lamellar structures that are not observed in any other fossil or recent foraminiferal group. The Paleozoic foraminifera, traditionally referred to one taxon (the class Fusulinata), possess at least three contrasting test wall microstructures, representing separate high-rank taxonomic groups. Fusulinata is most likely a highly polyphyletic group that is in need of taxonomic revision. The term Fusulinata, defined as including all Paleozoic calcareous forms except Miliolida and Lagenata, is not phylogenetically meaningful and should no longer be used or should be restricted to true complex fusulinids with microgranular test structures, which appeared in the Carboniferous.
24
MAMO, BRIONY L. "Benthic Foraminifera from the Capricorn Group, Great Barrier Reef, Australia." Zootaxa 4215, no. 1 (2016): 1. http://dx.doi.org/10.11646/zootaxa.4215.1.1.
Full textAbstract:
Effective reef management and monitoring has become increasingly important as anthropogenic processes impact upon natural ecosystems. One locality that is under direct threat due to human activities is the Australian Great Barrier Reef (GBR). Marine foraminifera represent an abundant and readily applicable tool that can be used in reef studies to investigate a variety of ecological parameters and assist in understanding reef dynamics and influence management protocols. The first step is to establish a baseline knowledge of taxonomic composition within the region to facilitate comparative studies and monitor how assemblages change in order to maximise effective management. A detailed taxonomic assessment is provided of 133 species of benthic foraminifera in 76 genera from Heron Island, One Tree Island, Wistari and Sykes Reefs, which form the core of the Capricorn Group (CG) at the southern end of the GBR. Of these 133 species, 46% belong to the order Miliolida, 34% to Rotaliida, 7% to Textulariida, 5% to Lagenida, 3% to Lituolida, 3% to Spirillinida, 1% to Loftusiida and 1% to Robertinida. Samples were collected from a variety of shallow shelf reef environments including reef flat, lagoonal and channel environments. Seventy species, representing the most abundant forms, are formally described with detailed distribution data for the remaining 63 species supplied.
25
Song, Haijun, Jinnan Tong, Z. Q. Chen, Hao Yang, and Yongbiao Wang. "End-Permian mass extinction of foraminifers in the Nanpanjiang basin, South China." Journal of Paleontology 83, no. 5 (2009): 718–38. http://dx.doi.org/10.1666/08-175.1.
Full textAbstract:
Newly obtained foraminifer faunas from the Permian-Triassic (P-Tr) transition at the Dajiang and Bianyang sections in the Nanpanjiang Basin, South China, comprise 61 species in 40 genera. They belong to thePalaeofusulina sinensisZone, the youngest Permian foraminifer zone in South China. Quantitative analysis reveals that the last occurrences of more than a half of species (28/54) fall into a 60-cm-interval at the uppermost Changhsingian skeletal packstone unit and thus calibrate the end-Permian extinction to the skeletal packstonecalcimicrobial framestone boundary. About 93% (54/58) of species of the latest Permian assemblage became extinct in the P-Tr crisis. Four major foraminiferal groups, the Miliolida, Fusulinida, Lagenida, and Textulariina, have extinction rates up to 100%, 96%, 92%, and 50%, respectively, and thus experienced selective extinctions. BothHemigordius longusand ?Globivalvulina bulloidestemporarily survived the end-Permian extinction event and extended into the earliest Triassic but became extinct soon after. The post-extinction foraminifer assemblage is characterized by the presence of both disaster taxa and Lazarus taxa. Foraminifer distribution near the P-Tr boundary also reveals that the irregular contact surface at the uppermost Permian may be created by a massive submarine dissolution event, which may be coeval with the end-Permian mass extinction. A new species,Rectostipulina hexamerata,is described here.
26
Li, Meng, Yanli Lei, Tiegang Li, and Shuaishuai Dong. "Response of Intertidal Foraminiferal Assemblages to Salinity Changes in a Laboratory Culture Experiment." Journal of Foraminiferal Research 50, no. 4 (2020): 319–29. http://dx.doi.org/10.2113/gsjfr.50.4.319.
Full textAbstract:
Abstract This study explored the response to salinity of intertidal foraminiferal assemblages from the Yellow Sea by culturing them for 100 days at six constant salinity levels (17, 22, 27, 32, 37, and 42 psu) in laboratory microcosms with four replicates each. A total of 7,471 live (stained) foraminiferal specimens were obtained and analyzed. The diversity parameters of foraminiferal assemblages (species richness, Margalef index, Shannon-Wiener index, and Fisher's alpha) declined significantly when the salinity was increased or decreased from the field value, but foraminiferal abundance was highly resistant to salinity. In addition, salinity exerted different effects on foraminifera from different orders. Specifically, the proportion of species from Order Miliolida significantly increased whereas that of species from Order Rotaliida decreased with increasing salinity. High salinity-tolerant species Ammonia aomoriensis, Cribrononion gnythosuturatum, Ammonia tepida, and Quinqueloculina seminula could fill unoccupied ecological niches when the proportion of salinity-sensitive species has declined. Furthermore, our morphometric results showed that foraminiferal test size was significantly negatively correlated with salinity, and numerous abnormal specimens appeared in foraminiferal assemblages when salinity deviated from the field value. Our study revealed that intertidal foraminiferal assemblages had high adaptability at different salinities because of the existence of high salinity-tolerant dominant species. In addition, salinity variation can significantly alter foraminiferal morphology in test size and abnormality.
27
Fleury, Jean-Jacques. "Données nouvelles sur Rhapydionina Stache, 1913 et Fanrhapydionina n. gen., un groupe de Rhapydioninidae (Alveolinacea, Foraminifera) foisonnant en région périadriatique au Campanien-Maastrichtien." Geodiversitas 36, no. 2 (2014): 173–208. https://doi.org/10.5252/g2014n2a1.
Full textAbstract:
Fleury, Jean-Jacques (2014): Données nouvelles sur Rhapydionina Stache, 1913 et Fanrhapydionina n. gen., un groupe de Rhapydioninidae (Alveolinacea, Foraminifera) foisonnant en région périadriatique au Campanien-Maastrichtien. Geodiversitas 36 (2): 173-208, DOI: 10.5252/g2014n2a1, URL: http://dx.doi.org/10.5252/g2014n2a1
28
Lee, Somin, and Fabrizio Frontalini and Wonchoel Lee. "A new record of larger benthic foraminifera from Jeju Island (South Korea)." Journal of Species Research 13, no. 1 (2024): 89–99. https://doi.org/10.12651/JSR.2024.13.1.089.
Full textAbstract:
Lee, Somin, Lee, Fabrizio Frontalini and Wonchoel (2024): A new record of larger benthic foraminifera from Jeju Island (South Korea). Journal of Species Research 13 (1): 89-99, DOI: 10.12651/JSR.2024.13.1.089
29
Schlagintweit, Felix, and Koorosh Rashidi. "Some New And Poorly Known Benthic Foraminifera From Late Maatrichtian Shallow-Water Carbonates Of The Zagros Zone, Sw Iran." Acta Palaeontologica Romaniae 12, no. 1 (2016): 53–70. https://doi.org/10.5281/zenodo.13189930.
Full textAbstract:
Schlagintweit, Felix, Rashidi, Koorosh (2016): Some New And Poorly Known Benthic Foraminifera From Late Maatrichtian Shallow-Water Carbonates Of The Zagros Zone, Sw Iran. Acta Palaeontologica Romaniae 12 (1): 53-70, DOI: 10.5281/zenodo.13189930
30
Robbins, L. L., P. O. Knorr, J. G. Wynn, P. Hallock, and P. J. Harries. "Interpreting the role of pH on stable isotopes in large benthic foraminifera." ICES Journal of Marine Science 74, no. 4 (2016): 955–64. http://dx.doi.org/10.1093/icesjms/fsw056.
Full textAbstract:
Large benthic foraminifera (LBF) are prolific producers of calcium carbonate sediments in shallow, tropical environments that are being influenced by ocean acidification (OA). Two LBF species, Amphistegina gibbosa (Order Rotaliida) with low-Mg calcite tests and Archaias angulatus (Order Miliolida) with high-Mg calcite tests, were studied to assess the effects of pH 7.6 on oxygen and carbon isotopic fractionation between test calcite and ambient seawater. The δ18O and δ13C values of terminal chambers and of whole adult tests of both species after 6 weeks were not significantly different between pH treatments of 8.0 and 7.6. However, tests of juveniles produced during the 6-week treatments showed significant differences between δ18O and δ13C values from control (pH 8.0) when compared with the treatment (pH 7.6) for both species. Although each individual's growth was photographed and measured, difficulty in distinguishing and manually extracting newly precipitated calcite from adult specimens likely confounded any differences in isotopic signals. However, juvenile specimens that resulted from asexual reproduction that occurred during the experiments did not contain old carbonate that could confound the new isotopic signals. These data reveal a potential bias in the design of OA experiments if only adults are used to investigate changes in test chemistries. Furthermore, the results reaffirm that different calcification mechanisms in these two foraminiferal orders control the fractionation of stable isotopes in the tests and will reflect decreasing pH in seawater somewhat differently.
31
Goeting, Sulia, Huan Chiao Lee, László Kocsis, Claudia Baumgartner-Mora, and David J. Marshall. "Diversity and Distribution of the Benthic Foraminifera on the Brunei Shelf (Northwest Borneo): Effect of Seawater Depth." Diversity 15, no. 8 (2023): 937. http://dx.doi.org/10.3390/d15080937.
Full textAbstract:
The marine benthic diversity of the Palawan/North Borneo ecoregion is poorly known, despite its implied unique high species richness within the Coral Triangle. The present study investigated the diversity and distribution of benthic foraminifera on the Brunei shelf. The objectives were to determine the species composition of sediment samples collected from 11 sites, extending ~70 km from the Brunei coastline and along a depth gradient of 10–200 m. We retrieved a total of 99 species, belonging to 31 families and 56 genera, out of which 52 species represented new records for Brunei and probably the ecoregion. Using presence/absence data, analyses were also performed to compare species diversity patterns (species richness, occupancy, taxonomic distinctness) and species assemblage similarity across the sites. For further insight into the relationship between distribution and depth-associated environmental conditions, we undertook stable isotope analyses of selected species of Rotaliida, Miliolida, and Lagenida. Oxygen isotope values were positively correlated with depth and species distribution, confirming cooler temperatures at greater depth. The carbon isotope data revealed species differences relating to habitat and food source specificity and a biomineralization effect. Close to one-third of the species were recorded from single sites, and species richness and taxonomic distinctness increased with depth and were greatest at the second deepest site (144 m). Together, these findings suggest data underrepresentation of diversity, habitat disturbance in shallower water, and species specialization (adaptation) in deeper water. Importantly, assemblage similarity suggests the occurrence of at least three marine biotopes on the Brunei shelf (10–40 m, 40–150 m, and >150 m). This study contributes significantly to our understanding of the local and regional patterns of foraminiferal diversity and distribution.
32
Dawood, Othman, and Salam Al-Hetty. "Facies Analysis and Depositional Environment of the Euphrates Formation in Selected Sections, Southwestern Iraq." Iraqi Geological Journal 57, no. 2D (2024): 172–86. http://dx.doi.org/10.46717/igj.57.2d.14ms-2024-10-24.
Full textAbstract:
The current study aims to investigate the microfacies, diagenetic processes, and depositional environments of the twenty-three rock samples from the Lower Miocene Euphrates Formation of two outcrops collected at Bahar-Najaf in Najaf governorate and Al-Shinafiya in Diwaniyah governorate, southern Iraq. Thin sections of these samples were prepared; hence, the nature of microfacies and related depositional environments was established. The formation contains abundant benthonic foraminifers and other fossils like miliolids, echinoderm, coral, gastropods, and pelecypods. Seven distinct microfacies were identified: lime mudstone, miliolid packstone, Pelletal Grainstone, Lime Wackestone, Peloidal Grainstone, Oolitic grainstone Microfacies, and fossiliferous packstone packed with bioclasts. Diagenetic processes evidenced in this study are dissolution, neomorphism, cementation, micritization, and dolomitization. The Euphrates Formation was deposited in a shallow marine setting with fluctuating energy levels, ranging from low-energy lagoons to moderate and high-energy shoals and fore-reef environments. Various microfacies indicate a complex depositional environment on a carbonate platform influenced by biota and sedimentary processes. These observations support the inference that the Euphrates Formation accumulated in shallow open marine, inner barrier, and shoal settings, providing a detailed interpretation of its para-depositional and diagenetic development.
33
Anan, Haidar Salim. "PALEONTOLOGY AND PALEOENVIRONMENT OF THE EARLY PALEOGENE PAKISTANIAN BENTHIC FORAMINIFERAL SPECIES OF HAQUE – SUBORDERS MILIOLINA AND LAGENINA." Earth Sciences Pakistan 5, no. 1 (2021): 42–47. http://dx.doi.org/10.26480/esp.01.2021.42.47.
Full textAbstract:
Thirteen Early Paleogene Pakistanian smaller Miliolid and eight Lagenid benthic foraminiferal species and subspecies from the Ranikot and Laki Formations of the Nammal Gorge, Salt and Sor Ranges, Punjab of Northern Pakistan have been studied. The modern taxonomic consideration and systematic description of the species is based on the diagnostic morphology, and provides a list of synonyms, short remarks about morphological features of the taxa and some annotations about taxa with problematic generic status. Two species of them belong to the genus Spiroloculina(haquei, pakistanica), four of Quinqueloculina (inflata, pseudosimplex, pseudovata, ranikotensis), two of Triloculina (psudoenoplostoma, sarahae), two of Agglutinella (reinemundi, sori) and three of Dentostomina (ammobicarinata, ammoirregularis, gapperi). One species of the Lagenid belongs to the genus Frondicularia (nammalensis), one of Lenticulina (reussi), one subspecies of Palmula (woodi nammalensis), one of Astacolus (vomeriformis), one of Vaginulinopsis (nammalensis), one of Lagena (reticulatostriata), one of Galawayella (nammalensis) and one of Parafissurina (pakistanica). The two species of the Miliolids: Spiroloculina (haquei, pakistanica) and one Lagenid Parafissurina (pakistanica) are believed to be new. Some of these species are recorded outside of Pakistan in Northern Tethys (France): Astacolus vomeriformis and Vaginulinopsis nammalensis. The high abundance of pelagic Pakistanian foraminiferal assemblage indicate open connection to the Tethys, which represents middle-outer neritic environment (100-200 m depth) and shows an affinity with ‘Midway-Type Fauna’.
34
Vachard, Daniel, François Le Coze, Pedro Cózar, and Jérémie Gaillot. "Bozorgnites nom. nov. and Crassispirellina nom. nov.: New names for the preoccupied foraminiferal genera Bozorgniella and Crassispirella." Palaeontologia Electronica 22, no. 1 (2019): 1–7. https://doi.org/10.26879/927.
Full textAbstract:
Vachard, Daniel, Coze, François Le, Cózar, Pedro, Gaillot, Jérémie (2019): Bozorgnites nom. nov. and Crassispirellina nom. nov.: New names for the preoccupied foraminiferal genera Bozorgniella and Crassispirella. Palaeontologia Electronica (4A) 22 (1): 1-7, DOI: 10.26879/927, URL: http://dx.doi.org/10.26879/927
35
Martin, Makenna M., Christina A. Kellogg, and Pamela Hallock. "Microbial Associations of Four Species of Algal Symbiont-bearing Foraminifers from the Florida Reef Tract, Usa." Journal of Foraminiferal Research 49, no. 2 (2019): 178–90. http://dx.doi.org/10.2113/gsjfr.49.2.178.
Full textAbstract:
Abstract While microbiome research is a rapidly expanding field of study, relatively little is known of the microbiomes associated with Foraminifera. This preliminary study investigated microbes associated with four species of Foraminifera, representing two taxonomic orders, which host three kinds of algal endosymbionts. A major objective was to explore potential influences on the microbiome composition, including phylogenetic relatedness among the host species, similarities in algal symbionts hosted, and environmental conditions from which the specimens were collected. Samples examined from two locations along the middle Florida Keys reef tract included 45 foraminiferal specimens and four environmental samples. Bacterial DNA extraction from individual specimens was followed by amplification and amplicon sequencing of the V4 variable region of the 16S rRNA gene; results were obtained from 21 specimens. The Order Miliolida, Family Soritidae, was represented by 5–8 specimens of each of three species: Archaias angulatus and Cyclorbiculina compressa, which both host chlorophyte symbionts, and Sorites orbiculus, which hosts dinoflagellate symbionts. Three Ar. angulatus specimens from which the microbiome was successfully sequenced shared 177 OTUs. Six C. compressa specimens successfully sequenced shared 58 OTUs, of which 31 were also shared by the three specimens of Ar. angulatus. Four successfully sequenced S. orbiculus specimens shared 717 unique OTUs. The 13 soritid specimens shared 26 OTUs, 23 of which represented Proteobacteria, predominantly of the bacterial family Rhodobacteraceae. The fourth foraminiferal species, Amphistegina gibbosa (Order Rotaliida) hosts diatom endosymbionts. Bacterial DNA extraction was attempted on 16 Am. gibbosa, including both normal-appearing and partly-bleached specimens. Only six OTUs, four of which represented Proteobacteria, were found in all eight specimens successfully sequenced. The partly bleached specimens shared nearly twice as many unique microbial OTUs (32) as the normal-appearing specimens (19). All Am. gibbosa specimens shared only four microbial OTUs with the soritid species, three of which may have been contaminants, indicating minimal commonality between the microbiomes of Am. gibbosa and the soritid taxa.
36
Mohammed, Aseel, and Amer Aljibouri. "Microfacies Analysis and Depositional Environment of Upper Oligocene-Lower Miocene Succession in Wadi Al-Khazgah of Anbar Governorate, Western Iraq." Iraqi Geological Journal 56, no. 2D (2023): 127–37. http://dx.doi.org/10.46717/igj.56.2d.10ms-2023-10-16.
Full textAbstract:
Microfacies and the Depositional Environment of (Upper Oligocene-Lower Miocene) succession in the Anah area, northwest of Anbar Governorate, western Iraq was carried out. This study was conducted on twenty-eight samples of limestone collected from the section of Wadi Al-Khazgah. Azkand and Anah formations of the Upper Oligocene and Euphrates Formation of Lower Miocene were identified in this section, depending on the availability of benthic Foraminifera and microfacies of each Formation. The depositional environment of the Azkand and Anah formations represents the environment of the reef, fore-reef, and back-reef, respectively, while the environment of the Euphrates Formation represents the shore, restricted to open marine.14 sub microfacies types have been distinguished, which are Lepidocyclina Lime Packstone, Miliolids Lime Grainstone, Coral Lime Boundstone, Miliolids Lime Packstone-Grainstone, Rotalia- Heterostegina Lime Packstone, Gastropoda Lime Packstone, Miliolids Lime Packstone, Heterostegina Lime Wackstone, Miliolids Lime Wackstone, Dolomitized Mudstone, Lime Mudstone.
37
Jones, Robert W., Michael D. Simmons, and John E. Whittaker. "On the stratigraphical and palaeobiogeographical significance of <i>Borelis melo melo</i> (Fichtel & Moll, 1798) and <i>B. melo curdica</i> (Reichel, 1937) (Foraminifera, Miliolida, Alveolinidae)." Journal of Micropalaeontology 25, no. 2 (2006): 175–85. http://dx.doi.org/10.1144/jm.25.2.175.
Full textAbstract:
Abstract. The stratigraphical and palaeobiogeographical significance of Borelis melo melo (Fichtel &amp; Moll, 1798) and B. melo curdica (Reichel, 1937) is re-assessed in the light of a taxonomic review. Borelis melo melo ranges at least throughout the Miocene, whereas B. melo curdica is restricted to the late Early to Middle Miocene. Both sub-species occur only in the Indo-Pacific Province in the late Early Miocene (‘early’ Burdigalian), but in both the Indo-Pacific and Mediterranean provinces in the latest Early–early Middle Miocene (‘middle’ Burdigalian–Langhian), implying a marine (re-)connection between the two regions at this time.
38
Drobne, Katica, and Vlasta Ćosović. "Palaeobiogeography of the Late Cretaceous to Paleogene larger Miliolids from tropical to subtropical sea belts (Neotethys to Caribbean)." Bulletin de la Société Géologique de France 180, no. 4 (2009): 317–31. http://dx.doi.org/10.2113/gssgfbull.180.4.317.
Full textAbstract:
Abstract Paleobiogeographic distribution within the larger, trematophore miliolids was evaluated using presence/absence (Parsimony Analysis) patterns and distributional extension of 7 genera and 47 species from the Coniacian to the Oligocene. The oldest group of larger miliolids (from late Cretaceous), represented by four parallel genera (Periloculina, Lacazina, Pseudolacazina, Idalina) from the southern Pyrenean province exhibits an endemic character. Later periods of the Senonian with uniform distribution of miliolids over the shallow-marine carbonate environments in the western and central Neotethys are characterized by reduction in generic diversity and in abundance of individuals. The morphological analysis indicated four major biogeographic regions for the Eocene larger Miliolids: 1) the Caribbean, 2) the “European” Neotethys (western, central and eastern), 3) the North African Neotethys (southern) and 4) the Indo-Pacific. The morphological biogeographic pattern corresponds to the circum-global Eocene current ocean system and the prevailing temperature sea surface gradient along tropical-subtropical paleolatitudes. A tendency to endemism can be observed for Fabulariids in the Caribbean during the Middle and Upper Eocene, and for Lacazinella during the Middle and late Eocene to Oligocene in the New Guinea and Molucca regions.
39
SIMMONS, MICHAEL, and MICHAEL BIDGOOD. ""Larger" Benthic Foraminifera Of The Cenomanian. A Review Of The Identity And The Stratigraphic And Palaeogeographic Distribution Of Non-Fusiform Planispiral (Or Near-Planispiral) Forms." Acta Palaeontologica Romaniae 19, no. 2 (2023): 39–169. https://doi.org/10.35463/j.apr.2023.02.06.
Full textAbstract:
SIMMONS, MICHAEL, BIDGOOD, MICHAEL (2023): "Larger" Benthic Foraminifera Of The Cenomanian. A Review Of The Identity And The Stratigraphic And Palaeogeographic Distribution Of Non-Fusiform Planispiral (Or Near-Planispiral) Forms. Acta Palaeontologica Romaniae 19 (2): 39-169, DOI: 10.35463/j.apr.2023.02.06, URL: http://dx.doi.org/10.35463/j.apr.2023.02.06
40
Gedik, Fatma. "First record of the new Neoplanorbulinid species (Foraminifera) from the Early Oligocene in Turkey, Malatya Basin, Eastern Taurids." Geodiversitas 39, no. 2 (2017): 273–84. https://doi.org/10.5252/g2017n2a6.
Full textAbstract:
Gedik, Fatma (2017): First record of the new Neoplanorbulinid species (Foraminifera) from the Early Oligocene in Turkey, Malatya Basin, Eastern Taurids. Geodiversitas 39 (2): 273-284, DOI: 10.5252/g2017n2a6, URL: http://dx.doi.org/10.5252/g2017n2a6
41
Martin, Ronald E., and Ramil C. Wright. "Information loss in the transition from life to death assemblages of foraminifera in back reef environments, Key Largo, Florida." Journal of Paleontology 62, no. 3 (1988): 399–410. http://dx.doi.org/10.1017/s0022336000059163.
Full textAbstract:
Despite numerous distributional studies of foraminifera in modern shallow-water carbonate environments, information loss and taphonomic bias in the transition from life to death assemblages of foraminifera in these environments have not previously been examined in detail. Surface sediment and vegetation samples were collected along six nearshore traverses and one traverse across the back reef lagoon off Key Largo, Florida. Living foraminifera are found in abundance on algae and the marine angiosperm, Thalassia testudinum, while foraminifera in sediment assemblages are represented primarily by empty tests. Q-mode cluster analysis of living assemblages on Thalassia delineates inshore (depth 0.4–2.7 m) and offshore (3.0–9.0 m) back reef biofacies. Calcareous imperforate (suborder Miliolina) species thrive in quiet waters of the inshore biofacies, in which biotic interactions appear to be the prime factor in determining small-scale species distributions of living foraminifera. Fragile species are most susceptible to test destruction, and, therefore, sediment assemblages are dominated by more robust forms (e.g., Archaias angulatus, Valvulina oviedoiana, thick-walled species of Quinqueloculina).Water turbulence primarily determines species composition of living populations of the offshore biofacies. These assemblages are dominated by the calcareous perforate (suborder Rotaliina) species Planorbulina acervalis and Rosalina bahamaensis. These species resist transport by encrusting Thalassia blades and having a test which fits flush with grass blades, respectively. However, sediment assemblages of the offshore biofacies are also dominated by typical inshore, robust species (Archaias angulatus, thick-walled miliolids). Thus, inshore and offshore biofacies are not readily differentiated by Q-mode cluster analysis of sediment assemblages. Robust species are wide ranging and often abundant in sediment because of differential preservation and time-averaging of sediment assemblages. The resultant taphonomic bias may interfere with paleoecologic interpretations concerning intensity of water energy and distance from shore.
42
Martin, Ronald E., and Ramil C. Wright. "Information loss in the transition from life to death assemblages of foraminifera in back reef environments, Key Largo, Florida." Journal of Paleontology 62, no. 03 (1988): 399–410. http://dx.doi.org/10.1017/s002233600001831x.
Full textAbstract:
Despite numerous distributional studies of foraminifera in modern shallow-water carbonate environments, information loss and taphonomic bias in the transition from life to death assemblages of foraminifera in these environments have not previously been examined in detail. Surface sediment and vegetation samples were collected along six nearshore traverses and one traverse across the back reef lagoon off Key Largo, Florida. Living foraminifera are found in abundance on algae and the marine angiosperm,Thalassia testudinum, while foraminifera in sediment assemblages are represented primarily by empty tests. Q-mode cluster analysis of living assemblages onThalassiadelineates inshore (depth 0.4–2.7 m) and offshore (3.0–9.0 m) back reef biofacies. Calcareous imperforate (suborder Miliolina) species thrive in quiet waters of the inshore biofacies, in which biotic interactions appear to be the prime factor in determining small-scale species distributions of living foraminifera. Fragile species are most susceptible to test destruction, and, therefore, sediment assemblages are dominated by more robust forms (e.g.,Archaias angulatus, Valvulina oviedoiana, thick-walled species ofQuinqueloculina).Water turbulence primarily determines species composition of living populations of the offshore biofacies. These assemblages are dominated by the calcareous perforate (suborder Rotaliina) speciesPlanorbulina acervalisandRosalina bahamaensis. These species resist transport by encrustingThalassiablades and having a test which fits flush with grass blades, respectively. However, sediment assemblages of the offshore biofacies are also dominated by typical inshore, robust species (Archaias angulatus, thick-walled miliolids). Thus, inshore and offshore biofacies are not readily differentiated by Q-mode cluster analysis of sediment assemblages. Robust species are wide ranging and often abundant in sediment because of differential preservation and time-averaging of sediment assemblages. The resultant taphonomic bias may interfere with paleoecologic interpretations concerning intensity of water energy and distance from shore.
43
BadrElDin, Ahmed Mohamed, Mohamed Mohamed Abdu Makbool, Mohamed Abdu ElSabrouti, and Pamela Hallock. "Distribution and Diversity of Benthic Foraminifera in the Coastal Area of Al-Bawadi Island, Southern Red Sea." Journal of Foraminiferal Research 52, no. 4 (2022): 264–77. http://dx.doi.org/10.2113/gsjfr.52.4.264.
Full textAbstract:
ABSTRACT The coastal areas of the southern Red Sea islands are non-urbanized, relatively pristine environments and are located on the main migration pathway of Indo-Pacific foraminiferal species to the northern Red Sea and to the Mediterranean Sea via the Suez Canal. Studying the foraminiferal composition, structure, and distribution in the Red Sea is essential to understanding how Indo-Pacific species can migrate to and survive in the Mediterranean Sea. Al-Bawadi, an uninhabited island located in the southern Red Sea, is an ideal location for such study. The coastal waters are oligotrophic, hypersaline, and very warm, overlying carbonate-rich, sandy-bottom and coral-reef substrata. In 25 sediment samples collected from water depths &lt;6 m, 79 foraminiferal species were recorded. Rotaliids dominated the assemblages, followed by miliolids; agglutinated foraminifers were scarce, and planktic species were not found. The larger-benthic, symbiont-bearing Neorotalia calcar dominated except in very shallow water, where smaller, free-living miliolid species dominated. The FoRAM Index (FI) was calculated for all samples; the symbiont-bearing group included seven genera comprising more than half of the total assemblage such that the FI&gt;4 for most samples from depths &gt;3 m, indicating that water quality is suitable for coral-reef growth and recovery. Diversity indices reflected prevailing normal marine to hypersaline conditions. Depth, presence of coral reefs, and hydrodynamics are the main factors controlling the spatial distribution of the foraminiferal assemblages. Occurrences of aberrant tests in the tidal flat area could be related to naturally occurring stresses, such as rapid changes in temperature and salinity, or to breakage and repair. Monitoring studies of unthreatened environments are essential to understand reef-related assemblages and to predict the migration pathways of thermo-tolerant and thermo-sensitive foraminiferal species.
44
Kouyoumontzakis, Georges. "Samples taken off Jamestown, Saint Helena Island (South Atlantic Ocean)." Journal of Micropalaeontology 8, no. 1 (1989): 1–7. http://dx.doi.org/10.1144/jm.8.1.1.
Full textAbstract:
Abstract. Three dredgings samples taken off the coast of Saint Helena, reveal two micropalaeontological associations. One is an infralittoral association, characterized by Miliolina (essentially Quinqueloculina), and by Rotaliina with various species of Amphistegina. The other is a circalittoral association, in which the following changes in family distribution may be observed: a decrease in Miliolina and others littoral species, and an increase in Discorbidae, Eponididae, Cibicididae, and Anomalinidae which indicate an increase in sea depth. The presence of relict Amphisteginidae might point to a Holocene stillstand of the transgressive sea.
45
Patel, M. P. "Evidence of Palaeoclimatic Fluctuations in Miliolite Rocks of Saurashtra, Western India." Journal Geological Society of India 45, no. 2 (1995): 191–200. http://dx.doi.org/10.17491/jgsi/1995/450207.
Full textAbstract:
Abstract Detailed studies of various miliolite occurrences of Saurashtra have revealed fluctuations in the palaeoclirnate witnessed in the course of deposition and consolidation of the dune material during Middle and late Upper Pleistocene. The entire process of formation of miliolite rocks is indicative of alternating arid and humid phases. During protracted arid phases strong wind actions were effective whereas during brief wet phases fluvial erosion & deposition and pedogenesis were brought about. The various evidences in support of palaeoclimatic fluctuations include: (i) the presence of erosional surfaces separating the miliolite deposits by intercalated redsoil horizons, cross-beddedand horizontally bedded miliolite deposits, two cross-bedded miliolite sequences with reversed dips and the two superimposed unidirectional cross-bedded miliolite sequences with different angles of dipin the coastal cliffsections, (ii) the occurrence of intercalated red beds and fluvial debris (sand/silt/gravel) within miliolite sequences as seen in some of the river and well sections, together with slope-wash debris between two miliolite layers substantiating small scale intervening periods of quiescence, (iii) a well defined junction between the two different major cycles of aeolian accumulation marked by the surfaces of non-deposition, erosion and honeycomb weathering at the top of the lower cycle as encothered in some of the well sections, (iv) burial of animal burrows by a younger cycle of miliolites devoid of animal burrows in some exposures and (v) the presence of diagenetically formed coated grains, vadose calcite silt around the ooliths & intraclasts, and its occurrence between two generations of cement in thin section also provide aclue to the minor breaks in diagenetic environment.
46
Al-Hetty, Salam O., Osama J. mohammad, Amer S. Al-Jibouri, and Aseel Adnan. "Microfacies Analysis and Paleoenvironment of Baba Formation, Anah Area Westren Iraq." IOP Conference Series: Earth and Environmental Science 1300, no. 1 (2024): 012030. http://dx.doi.org/10.1088/1755-1315/1300/1/012030.
Full textAbstract:
Abstract Microfacies analysis and Paleoenvironment of Baba Formation were investigated in Anah area, Anbar Governorate, Western Iraq. Baba Formation was cropped out in Wadi Al-Khazgah section with 9 meters thick, consisting of white to creamy, chalky, coralline, high fracture Limestone. Five Microfacies types were recognized Coral Lime Boundstone, Lepidocyclina Lime Packstone, Nummulitids Lime Packstone, Miliolids Lime Packstone - Grainstone, and Coraline Algae Lime Wackestone described in 10 samples collected from one section (Wadi Al-Khazgah Al-Gharbi section). These Microfacies described on the basis of the presence of the Benthic Large Foraminifera (BLF) as Miliolids, Lepidocyclinide, Rotalide and skeletal fragments of brachiopod, coral, and algae shell. The paleoenvironment of Baba Formation was determined fore-Reef and Reef environments.
47
Holzmann, M., J. Hohenegger, P. Hallock, W. E. Piller, and J. Pawlowski. "Molecular phylogeny of large miliolid foraminifera (Soritacea Ehrenberg 1839)." Marine Micropaleontology 43, no. 1-2 (2001): 57–74. http://dx.doi.org/10.1016/s0377-8398(01)00021-4.
Full text
48
Babazadeh, Seyed Ahmad. "New stratigraphic data of Upper Paleocene-Lower Eocene carbonate deposits in east Iran: lithostratigraphic, biostratigraphic and sedimentological implications." Revue de Paléobiologie 39, no. 2 (2020): 485–500. https://doi.org/10.5281/zenodo.4460704.
Full textAbstract:
Lower Paleogene shallow marine carbonate rocks are exposed nearby the Shusf city in the Nehbandan area, East Central Iran. The sedimentary succession consists of siliciclastic rocks, siliciclastic-carbonate rocks, evaporitic rocks and carbonate rocks. The stratigraphic analysis of nearby the Shusf city allows to identify four informal rock units namely Palang, Chahchocho, Zibro and Debil formations in the study area. Likewise this paper introduces a detailed study of benthic foraminifera and four local assemblage zones from Selandian to Early Ilerdian age were established for the first time. These assemblages are correctable with the benthic foraminiferal assemblages from Adriatic area (Slovenia), Pyrenees (Spain) and Egypt. The wackestone facies contains the small and large porcelaneous foraminifera which accompany with small hyaline foraminifera, depositing approximately in the same depth in the inner ramp. The grainstone facies consists of hyaline foraminifera, which deposited in middle ramp. The distinctive characteristics of the middle ramp are thinning and flattening of the larger foraminifera shells. Ten microfacies types were recognized corresponding to ramp environment in three depositional settings (littoral, lagoon and barrier) based on sedimentological characteristics and foraminiferal assemblages. The identified microfacies are: evaporitic facies, siliciclastic facies, siliciclastic-carbonate facies, miliolid-pellet wackestone, Valvulina-miliolid wackestone, Alveolina-miliolid wackestone, green algal-Nummulites packstone, hyaline-porcellaneous foraminifera grainstone, hyaline foraminifera sandy limestone and hyaline foraminifera grainstone.
49
Hawazen N. Farhan, Lafta S. Kadem, and Qahtan A. Mohammed. "Microfacies and depositional environment of Bajawan and Baba Formations in Kirkuk Oil fields north Iraq." Tikrit Journal of Pure Science 21, no. 6 (2023): 112–25. http://dx.doi.org/10.25130/tjps.v21i6.1089.
Full textAbstract:
The study of six selected wells from Kirkuk oil field petrographic and physical properties ; investigation while leads to interpret the microfacies and environment for Bajawan and Baba Formations. Five carbonate microfacies distingished from Bajawan Formation ( Lime Mudstone Microfacies, Fossiliferous Lime Wackstone Microfacies, Miliolid Packstone Microfacies, Miliolid Grainstone Microfacies and Coral, Boundstone microfacies ), while Two microfacies described from Baba Formation (Limestone bearing Larger foraminifera (Lepidocylina- Nummulites) packstone-wackstone microfacies and Fossiliferous Floatstone bearing Larger Foraminifera microfacies ).
 According to different types of microfacies that described from Bajwan and Baba Formations , the depositional environment of Bajawan Formation is backreef/reef or restricted lagoon (inner ramp), but for Baba Formation is shallow water forereef (middle ramp). The facies model were constructed on basis of stratigraphy, lateral and vertical facies change and depositional environment of Oligocene succession.
50
Anan, Haidar Salim. "TETHYAN BARTONIAN-PRIABONIAN DIAGNOSTIC BENTHIC FORAMINIFERA PART II: SUBORDER MILIOLINA." Earth Science Malaysia 8, no. 2 (2024): 166–71. https://doi.org/10.26480/esmy.02.2024.166.171.
Full textAbstract:
The modern taxonomical consideration is used for the studied fifty two small porcelaneous benthic foraminiferal species of the Suborder Miliolina throughout the Bartonian-Priabonian belonging to nine genera from seventeen countries in the Norther Tethys (USA, France, Belgium, Germany, Austria, Italy, Hungaria, Slovenia, Turkey) and Southern Tethys (Ecuador, Chile, Argentina, Libya, Egypt, UAE, Pakistan, India). Two of the recorded species are treated here as new: Massilina saidi Anan, n. sp. and Quinqueloculina alaghai Anan, n. sp. Some of the recorded species are distributed outerside its original description in neighbor localities or even far from it, but others are endemic to their original description. The recorded foraminiferal assemblage indicates an open marine environment, and represents favor warm, marginal to deep sheltered environments.