Relevant bibliographies by topics / Ostracod

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Academic literature on the topic 'Ostracod'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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Journal articles on the topic "Ostracod"

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CHATTERJEE, TAPAS, IGOR DOVGAL, ROSAURA MAYÉN-ESTRADA, and GREGORIO FERNANDEZ-LEBORANS. "A checklist of ciliates (Ciliophora) inhabiting on ostracods (Crustacea, Ostracoda)." Zootaxa 4763, no. 1 (April 8, 2020): 17–30. http://dx.doi.org/10.11646/zootaxa.4763.1.2.

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A compilation of the ciliated species found on freshwater and marine ostracods as epibiont or parasite (endobiont) has been carried out based on published records. The checklist includes the taxonomic position of each species of epibiontic and endobiontic ciliate, the species of basibiont ostracodes, the geographic zones and the bibliographic references where they were recorded. Altogether 7 suctorian, 29 peritrich, one apostome and one scuticociliatid species were listed. Two of recorded suctorian species are possible specific to marine ostracodes, whereas only one, Tokophrya sibirica to freshwater hosts. Fourteen species of peritrichs are likely specific to freshwater ostracodes, while three possible specific to marine ostracode hosts. Other suctorian and peritrich ciliate species were found on a variety of host taxa. One species of scuticociliatid was recorded as endobiont in ostracod.
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Hajek-Tadesse, Valentina, and Božo Prtoljan. "Badenian Ostracoda from the Pokupsko area (Banovina, Croatia)." Geologica Carpathica 62, no. 5 (October 1, 2011): 447–61. http://dx.doi.org/10.2478/v10096-011-0032-9.

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Badenian Ostracoda from the Pokupsko area (Banovina, Croatia)In this paper we present the results of the investigations on the Badenian (Middle Miocene) ostracods from the Pokupsko area. For the first time the presence of Badenian aged sediments in Croatia can be supported by the occurrence of ostracod biozonal markers. Four Badenian ostracod zones are established: Lower Badenian Biozone NO7Acanthocythereis hystrix-Bythocypris lucida, Middle Badenian Biozone NO8Eocytheropteron inflatum-Olimfalunia spinulosa, and the two Upper Badenian Biozones NO9Neomonoceratina laskarevi-Miocyprideis sarmatica elongataand NO10Carinocythereis carinata-Phlyctenophora farkasi.On the basis of the generally accepted paleoecology of selected genera, we identified the following ostracod faunas: shallow-water marine, shallow-water brackish-marine, shallow-water reef, and deep-water marine. The paleontological and trace element analyses suggest that the Pokupsko ostracod fauna lived in shallow (50 m deep), warm, and limpid waters, connected to a deeper sea and occasionally exposed to freshwater inflows.
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Altinsaçli, Selçuk, Ferda Perçin Paçal, and Songül Altinsaçli. "ASSESSMENTS OF ENVIRONMENTAL VARIABLES AFFECTING THE SPATIOTEMPORAL DISTRIBUTION AND HABITAT PREFERENCES OF LIVING OSTRACODA (CRUSTACEA) SPECIES IN THE ENEZ LAGOON COMPLEX (ENEZ-EVROS DELTA, TURKEY)." Ecologica Montenegrina 19 (December 14, 2018): 130–51. http://dx.doi.org/10.37828/em.2018.19.14.

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The present study analyzed the spatiotemporal changes of Ostracoda fauna in eight coastal lagoons in the Enez-Evros delta (Tuzla Lake 1, Tuzla Lake 2, Tuzla Lake 3, Taz, Işık, Dalyan, Kuvalak, and Taşaltı), located along the northern Aegean Sea coastline of Turkey. Recent ostracod samples collected from the eight lagoons were analyzed, and 16 living ostracod species (belonging to 14 genera) were identified during the sampling periods. The most abundant species were found to be Cyprideis torosa and Loxoconcha elliptica. C. torosa, a cosmopolitan and opportunistic species of Ostracoda, was found in all the studied coastal lagoons. All ostracod species determined in the lagoons were grouped into three assemblages: Group 1: halophilic continental freshwater species (F. fabaeformis, C. vidua, D. stevensoni, E. virens, H. salina, I. biplicata, I. bradyi, L. inopinata, and S. aculeata); Group 2: euryhaline and typical brackish water species (C. torosa and L. elliptica); Group 3: marine (coastal: A. convexa, L. rhomboidea, C. elongata, and X. communis) and brackish (lagoonal: L. lacertosa) water species. These species of Ostracoda were shown to be affected by environmental conditions. Analyses with the physicochemical variables and species (Spearman’s rank correlation coefficient and Canonical Correspondence Analysis) confirmed that ostracod distribution in the Enez lagoons are controlled by seawater–freshwater inputs and by salinity. The purpose of this work is about to present data about of the Enez lagoons, and analyze the diversity of ostracods of them.
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PINTO, RICARDO L., CARLOS E. F. ROCHA, and KOEN MARTENS. "On the first terrestrial ostracod of the Superfamily Cytheroidea (Crustacea, Ostracoda): description of Intrepidocythere ibipora n. gen. n. sp. from forest leaf litter in São Paulo State, Brazil." Zootaxa 1828, no. 1 (July 23, 2008): 29. http://dx.doi.org/10.11646/zootaxa.1828.1.3.

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Of the three superfamilies of Ostracoda present in fresh water, only the Cytheroidea had thus far no records in terrestrial environments. Here, we report on a new genus and species, Intrepidocythere ibipora n. gen. n. sp., of the ostracod superfamily Cytheroidea, from forest leaf litter in São Paulo State, Brazil. Judging from morphological similarities, this new genus is believed to be closely related to the genus Elpidium. Possible pathways that led to the colonisation of terrestrial habitats are discussed, and an overview is given on the distribution of the known terrestrial ostracod lineages. The present findings strengthen the idea that terrestrial ostracods are more common than previously thought, at least in tropical areas.
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Song, Junjun, Sylvie Crasquin, and Yiming Gong. "Ostracods (Crustacea) as shelf to basin indicators: evidence from Late Devonian Yangdi and Nandong sections in Guangxi, South China." Journal of Micropalaeontology 37, no. 1 (February 5, 2018): 257–81. http://dx.doi.org/10.5194/jm-37-257-2018.

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Abstract. Forty-eight ostracod species belonging to 28 genera from the Late Devonian of Guangxi in South China are described and figured. The ostracod assemblage from the Nandong section can be attributed to the rhenana–linguiformis conodont zones. The ecological assemblages of ostracods from the Yangdi section correspond to a smooth-podocopid association accompanied by some pelagic entomozoids. This mixed assemblage is indicative of an environment of carbonate platform to slope during an ongoing regression. The ostracod faunas from the Nandong section are on the contrary composed of both pelagic and benthic ostracods and pelagic forms dominate in number of specimens suggesting a basin environment.
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Arias, Carmen. "Diversity dynamics of Early Jurassic ostracods of the Cordillera Ibérica (Spain) and the re-evaluation of the Pliensbachian–Toarcian mass extinction." Canadian Journal of Earth Sciences 44, no. 10 (October 1, 2007): 1397–411. http://dx.doi.org/10.1139/e07-018.

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The extinction and recovery of Ostracoda at the Pliensbachian–Toarcian (P–T) boundary are analyzed based on a database of taxonomically revised Pliensbachian to Toarcian transition ostracod assemblages. In contrast to earlier assertions, the results of this study indicate that ostracod extinction rates were significant in comparison with other marine invertebrates. An extinction rate of 54% has been calculated for upper Pliensbachian ostracod species occurring in more than one section. Diversification took place in the latest Pliensbachian (Spinatum Zone) and early Toarcian (Tenuicostatum Zone), whereas diversity decrease occurred in the middle early Toarcian (Strangewaysi Subzone, Serpentinus Zone). This notable diversity decline in the early Toarcian corresponds to a global mass extinction time, whose peak has been documented in the Tenuicostatum Zone. Meanwhile, the ostracod mass extinction occurred within the Serpentinus Zone and was followed by radiation and recovery in the succeeding Bifrons Zone. Similar diversity changes of ostracods are observed in other European areas, although in the Cordillera Ibérica, the demise began later. Many aspects of this event are still debated, and there is no common cause or single set of climatic or environmental changes common to this event. The supposed extinction-causing environmental changes resulting from anoxia episodes are unclear and are unlikely to have been of sufficient intensity or geographic extent to cause this global extinction. In this paper, the decrease in marine species diversity is explained by a new palaeoceanographic scenario, in which a rapid global cooling episode is regarded as the ultimate cause.
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Masurel, H. "Ostracods as palaeoenvironmental indicators in the Lower Carboniferous Yoredale Series of northern England." Journal of Micropalaeontology 8, no. 2 (December 1, 1989): 157–82. http://dx.doi.org/10.1144/jm.8.2.157.

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Abstract. The ostracod fauna and vertical changes in its composition were examined in a shale sequence of the 5-Yard Limestone cyclothem (Yoredale Series) at a locality in Bishopdale, N. Yorkshire. The ostracod tax a are mainly confined to three superfamilies: Kirkbyacea, Healdiacea and Bairdiacea. The co-occurrence of several relatively short-ranging species such as Kirkbya quadrata, Cribroconcha insculpta and Bairdiolites elevatus suggests a Late Brigantian age. Four new species are described: Cornigella posteroextensa, ? Eriella minima, Rectobairdia bavarica and Roundyella binoda.Fluctuations in influx of terrigenous mud and water turbulence, related to delta growth, appear to have been the main environmental parameters that controlled the ostracod distribution and abundance along a nearshore-offshore gradient. Three different ostracod assemblages are recognized. A Roundyella-Cribroconcha assemblage, dominated by kirkbyacean and healdiacean ostracods, represents a quiet, nearshore environment with a fairly high depositional rate of terrigenous mud. A Bairdia assemblage, higher in the section, is dominated by bairdiacean ostracods that lived in a more turbulent, relatively offshore environment with less input of terrigenous sediment. A third, intermediate assemblage consists of almost equal amounts of bairdiacean and kirkbyacean ostracods, and reflects a transition from the Bairdia to the Roundyella-Cribroconcha assemblage.
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Higuti, J., FA Lansac-Tôha, LFM Velho, and K. Martens. "Biodiversity of non-marine ostracods (Crustacea, Ostracoda) in the alluvial valley of the upper Paraná River, Brazil." Brazilian Journal of Biology 69, no. 2 suppl (June 2009): 661–68. http://dx.doi.org/10.1590/s1519-69842009000300020.

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In the present study, we test the relevance of a number of environmental factors on alpha and beta ostracod diversities, at species and family level. Ostracods were sampled from several substrates, including sediment and root systems of various floating aquatic macrophytes, from 48 environments (both lentic and lotic habitats, ranging from the river itself, over connecting channels linking with open lakes, and, finally closed lakes), belonging to four different systems (Paraná, Ivinheima, Baía and Taquaruçu), in the alluvial valley of the Upper Paraná River. The faunistic survey recorded the presence of 54 species of Ostracoda, belonging to the families Cyprididae, Candonidae, Limnocytheridae and Darwinulidae. Various diversity estimators indicated that these recorded levels of specific diversity should be close to true values. Higher values of ostracods species richness (alpha diversity) were observed in the Baía and Ivinheima systems, while lotic habitats were richer than lentic ones. In addition, open lakes appeared to be more affected by the variable 'system' than closed ones, which can to some extend be explained by the putative effects of flood pulse on benthic communities. The two investigated factors have different effects on the four ostracod families. The present study also indicated that there is a large homogeneity within and between systems, as exemplified by the low beta-diversity levels.
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Miller, C. Giles, Mark Williams, and David J. Siveter. "Palaeocope ostracods from the Silurian Wenlock Series of Arctic Canada." Canadian Journal of Earth Sciences 47, no. 6 (June 2010): 913–25. http://dx.doi.org/10.1139/e10-010.

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Silurian Wenlock Series deposits of the Cape Phillips Formation on Baillie-Hamilton Island and Cornwallis Island, Arctic Canada, have yielded a silicified ostracod assemblage that spans the late Sheinwoodian and Homerian stages. Sixteen palaeocope ostracod species are recorded, including the new species Beyrichia ( Beyrichia ) marssae , Gabrielsella ? copelandi , and Platybolbina ( Abruptobolbina ) adraini . The ostracod faunas can be linked into local trilobite, microvertebrate, and graptolite zonal schemes, and a few of the ostracod species offer potential for local and perhaps wider biostratigraphical correlation. The ostracods are mostly known only from the Cape Phillips Formation, but also include two taxa found in the Wenlock Series of the Avalanche Lake area, Northwest Territories, Canada. Other ostracod species suggest links with Silurian successions in northern Canada and the Baltic. Low-diversity ostracod faunas characterize the level of a marked positive carbon isotope excursion and coeval mid-Homerian regression at the level of the regional Pristiograptus dubius – Gothograptus nassa graptolite Biozone. Comparison with the pattern of distribution of coeval ostracod faunas elsewhere in Canada suggests that diversity changes in the Cape Phillips Formation ostracod faunas are controlled by local palaeoenvironmental factors perhaps linked to global sea-level change.
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Siveter, David J., Derek J. Siveter, Mark D. Sutton, and Derek E. G. Briggs. "Brood care in a Silurian ostracod." Proceedings of the Royal Society B: Biological Sciences 274, no. 1609 (November 21, 2006): 465–69. http://dx.doi.org/10.1098/rspb.2006.3756.

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An exceptionally preserved new ostracod crustacean from the Silurian of Herefordshire, England, preserves eggs and possible juveniles within its carapace, providing an unequivocal and unique view of parental brood care in the invertebrate fossil record. The female fossil is assigned to a new family and superfamily of myodocopids based on its soft-part anatomy. It demonstrates a remarkably conserved egg-brooding reproductive strategy within these ostracods over 425 Myr. The soft-tissue anatomy urges extreme caution in classifying ‘straight-hinged’ Palaeozoic ostracods based on the carapace alone and fundamentally questions the nature of the shell-based Palaeozoic ostracod record.
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Dissertations / Theses on the topic "Ostracod"

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Keatings, Kevin William. "The basis for ostracod shell chemistry in palaeoclimate reconstruction." Thesis, Kingston University, 1999. http://eprints.kingston.ac.uk/20651/.

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This project examined the trace-element and stable-isotope composition of non-marine ostracod shells and their use in Holocene palaeoclimate reconstruction, with particular reference to mid-latitude shallow carbonate lakes. Controls on the chemical composition of shells from such environments were studied. Results were used to test the application of ostracod shell chemistry data to palaeoclimate reconstruction. Selected techniques were applied to a high resolution study of Holocene lake marl sequence. The project investigated influences on shell chemistry during formation, sedimentary deposition and extraction. A core covering approximately 9,450 to 5,800 Cal. Yr BP was taken from Cunswick Tarn, Cumbria, yielding ostracod faunal and shell chemistry data used to produce a palaeoclimate interpretation for the early Holocene. This interpretation agreed with studies showing a warm, dry early Holocene and a cooler, wetter mid-Holocene. Seasonal sampling of water and ostracods at Cunswick Tarn provided a modern analogue for the core material. Species-specific fractionations of stable isotopes were similar to findings from ponds in Greywell, Hampshire. There were seasonal variations in the trace-element composition of shells, which may reflect: seasonal fluctuations; shell growth following initial calcification; and cleaning problems. Monthly sampling of water and ostracods was performed at carbonate ponds near Greywell. Species-specific fractionations of oxygen isotopes were observed. Compared to theoretical equilibrium calcite, all species exhibit [delta][sup]18 O values more positive than expected, while [delta][sup]13 C values equal equilibrium values. Variations in shell trace-element composition was greater than that of the water. This result may be related to animal physiology and the water’s low trace-element content. Ostracods collected from additional sites with elevated Mg/Ca[sub](water) ratios showed the best correlation between the Sr/Ca ratio of the water and the Sr/Ca of the shell. Effects of established cleaning techniques on shell chemistry were investigated. Whenever possible, only brush cleaning with deionised water should be used. Sodium hypochlorite is recommended for any further cleaning. An investigation of the effect of partial dissolution on shell chemistry demonstrated that even extremely degraded Cypretta brevisaepta shells have similar trace-element and stable-isotope ratios to unaltered shalls. However, dissolution may alter shell chemistry, and whenever possible, pristine shells should be used. Pseudocandona rostrata specimens from Greywell were grown in vitro. Adults had low weight with low M/Ca ratios. The Sr/Ca[sub](ostracod) ratios were negatively correlated with weight, while M/Ca[sub](ostracod) ratios were weakly positively correlated with M/Ca[sub](water), Sr/Ca[sub](water), and temperature. The research shows that a knowledge of the life-history and ecology of ostracods, together with the chemical signals recorded in their shells, can provide an effective tool for the interpretation of palaeoclimatic events.
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Ingram, Caroline S. "Ostracod palaeoecology and biogeochemistry of marine and estuarine interglacial deposits in North West Europe." Thesis, Bangor University, 1999. https://research.bangor.ac.uk/portal/en/theses/ostracod-palaeoecology-and-biogeochemistry-of-marine-and-estuarine-interglacial-deposits-in-north-west-europe(4cd7fd25-815b-4e1d-aebb-cada60a3d9b4).html.

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Ostracods were obtained from two cores in the southern North Sea area: the Sand Hole and Swarte Bank Formations of Tappin (1991) in BGS borehole 81/52A, cored from the Inner Silver Pit, southern North Sea, and a core from Shoeburyness in Essex, borehole S 1. The faunal assemblages in 131-181/52A were dominated by Sarsicytheridea punctillata, Elo/sonella concinna and Acanthocvthereis clunelmnensis. The assemblages recovered reflect a transition from glacio-marine conditions in the Swarte Bank Formation up into a cold-temperate marine environment in the Sand Hole Formation with deteriorating temperatures indicated at the top of the interval studied. In BHSI a freshwater to brackish transition occurred in the core, the freshwater section being dominated by Darwinula slevensoni and llyocypris spp., and the brackish section by Cyprideis torosa and C ytheromor pha fiiscata. The palaeoecology of the ostracod assemblages recovered is compared to other palaeoecological data from the same sections in each core and to ostracod data from other Hoxnian/l lolsteinian sites in north western Europe. These data are also discussed in the light of evidence indicating that there was a barrier across the southern North Sea when the sediments examined were deposited. Sarsicytheridea spp. and (yprideis terosa were used for trace element (Mg: Ca, Sr: Ca) and stable isotope (cS'"O, ö'3C) analyses. A calibration equation for the calculation of temperature from Mg: Ca ratio was successfully established from analysis of modern Sarsicytheridea. Modern Sr: Ca data could not be used to establish a calibration for salinity since there was too much scatter in the data. (' prideis torosa has been used for trace element and stable isotope work by other authors who have published relationships between ('yprideis and the water chemistry. Ostracods were also analysed down core to examine the changing ratios of Mg and Sr as a proxy for temperature and salinity changes in the I-loxnian of the southern North Sea. In BH81/52A, Mg: Ca data indicated a deterioration in temperature from 36.20 m to the top of the section studied of 9°C. Oxygen stable isotopic analyses from the same species, measured through the same core intervals, did not exhibit a trend, but their values were indicative of normal marine salinities. Carbon stable isotope analyses, performed at the same time as the oxygen analyses, indicate that there may have been high productivity in the region of deposition of the Sand Hole Formation, implying deposition in a region of freshwater influence. However, C/N analyses indicated that the sediments in the Inner Silver Pit were deposited under fully marine conditions. In III ISI, both the Mg: Ca and Sr: Ca data suggested that salinity had increased upcore. Ilowever, there was a lot of scatter in the data, indicating that the estuarine environment, under which the palaeoecology suggests the sediments were deposited, was a highly fluctuating one. These data compare favourably with previously published records. Published partition coefficients were used to compare the trace element data obtained to mean river and seawater values.
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White, Tom Samuel. "Late middle Pleistocene molluscan and ostracod successions and their relevance to the British Paleolithic record." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648393.

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Gaiger, Frances Jean. "Mid-Pleistocene Extinction of Deep-Sea Ostracoda?" Thesis, University of Canterbury. Geological Sciences, 2006. http://hdl.handle.net/10092/1349.

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A global extinction event has been documented in protozoan foraminifera in the late Pliocene to Pleistocene. The timing of the extinction event varied depending on location, however for Ocean Drilling Project Site 1125, disappearances occurred between 2.5 and 0.57 Ma, with the major decline approximately 1.1 Ma. In order to determine if this event affected benthic organisms other than protozoans, this study was undertaken to determine how podocopid ostracods (Crustacea) recovered Ocean Drilling Program Site 1125 responded. The present study was hindered by the small number of valves recovered; the fact that a large proportion of taxa found were undescribed and new to science; and the current state of taxonomic scheme that is under significant revision. These factors meant that a comprehensive comparison could not be achieved. Despite this, counts of ostracod valves and assessments of diversity from this study reveal a significant increase in both parameters from approximately 900-600 ka. Three possible causes were investigated to account for this increase, sediment type and sample size; affects of taphonomy, mainly dissolution; or an actual biotic 'event'. Statistical analyses showed that although sample size did have some effect, it was not the sole reason for the increase in ostracod numbers. Dissolution had an expected affect on the percentage of juveniles but no correlations were found with other sample characteristics. Sedimentation rate was investigated but this also proved unrelated. Therefore, it is suggested that the increase in total ostracod valves and diversity which occurs between 900 and 600 ka was in fact a natural, biotic 'event'. This preliminary evidence suggests that an oceanographic event that has negatively impacted on the foraminifers has had the reverse affect on the ostracod assemblage, in the sense that both population size and diversity increase during that time.
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Davies, Miles. "Ostracod assemblages and paloeoenvironments of a purported cold water section of the Mannum Formation, Devon Downs, South Australia /." Title page, contents and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09S.B/09s.bd2561.pdf.

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Thesis (B. Sc.(Hons.))--University of Adelaide, Dept. of Geology and Geophysics, 1996.
Australian National Grid reference S1/54 Renmark sheet 1:250000. Includes bibliographical references (leaves 37-43).
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Mohibullah, Mohibullah. "The taxonomic, palaeoecologic and biogeographic importance of the Late Ordovician Laurentian ostracod fauna of the Girvan District, SW Scotland." Thesis, University of Leicester, 2012. http://hdl.handle.net/2381/11032.

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Ostracods form a numerically important component of certain Late Ordovician faunas of the Girvan district, southwest Scotland. Fifty-two ostracod taxa are identified, including twenty-three discussed in open nomenclature, and seventeen species that are considered as nomen dubia. The fauna reveals new and important data bearing on the biostratigraphic, palaeogeographic and palaeoecologic significance of the Girvan Lower Palaeozoic succession. Much of the Ordovician ostracod fauna of the Girvan district preserved in clastic deposits represents transported material. However, those ostracods from the early Katian Craighead Limestone Formation define shallow marine and open marine faunas respectively. The Girvan ostracods include many short-ranging species which are useful for inter-regional correlation of the Late Ordovician succession of Scotland and North America; these include Hippula ventrospinosa, Balticella deckeri, Eurychilina sunbloodensis and Baltonotella parsispinosa which characterize Sandbian age strata, and Kinnekullea comma which is typical for the Katian (anceps graptolite Biozone). Biogeographically most of the Girvan fauna is typically of North American aspect at the species level but from the early Katian onwards shows generic links with Baltica and Avalonia. The spatial and temporal distribution patterns of the Girvan Late Ordovician ostracod fauna are assessed in the context of the entire Late Ordovician Laurentian ostracod assemblage particularly for the Sandbian interval, where ostracod diversity was highest at species and genus level. Multivariate analysis demonstrates that geography had the strongest control on the global distribution of Ordovician benthic ostracods. Within Laurentia Sandbian ostracods show striking inter-basinal endemism at species level, ranging from 25% endemic in the Foxe Basin of the Franklin district, Canada to 75% in the Michigan basin. This pattern of endemism is common in other benthic groups such as brachiopods, and may indicate rapid speciation in microhabitats. Despite the strong overprint of local endemism, pan-continental faunal differences are noticed between the midcontinent and marginal Laurentian ostracod assemblages that are confirmed by multivariate analysis, and these allow the demarcation of a ‘Midcontinent’ and a southern ‘Marginal’ province for the Sandbian. Ostracod assemblages of the two provinces appear to have been controlled by physical parameters such as temperature and salinity which are related to water depth and latitude.
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Zazzali, Sindbad. "Paléobiodiversité des ostracodes à la limite Permien moyen - Permien supérieur." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066111/document.

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Les ostracodes, microcrustacés (Arthropoda), sont relativement abondants dans les archives paléontologiques. Sensibles aux variations paléoenvironnementales, la composition des assemblages et leur diversité sont d’excellents marqueurs des changements qui affectent le benthos marin néritique. Leur diversité est connue pour être fortement affectée par la crise biologique marquant la limite Permien-Trias, mais leur histoire à la fin du Permien moyen reste peu documentée.Près de 10 Ma avant la limite Permien-Trias, à la fin du Permien moyen, un important épisode d’extinction intervient, préfigurant le déclin de la biodiversité à la fin du Paléozoïque.L’étude systématique des échantillons prélevés le long des coupes de Chaotian (province du Sichuan, Chine) et de Penglaitan (province du Guangxi, Chine) a permis l’identification de 115 espèces d’ostracodes, dont 7 nouvelles. Le travail réalisé sur ces coupes constitue la toute première étude des événements de la fin du Permien moyen et du début du Permien supérieur s’appuyant sur l’observation des assemblages d’ostracodes. L’état de conservation des carapaces d’ostracode, étudié lors de ce travail, enregistre les effets de la fin d’un épisode de régression et le début d’un épisode de transgression au sommet du Permien moyen à Penglaitan. Les résultats s’avèrent en accord avec les données lithologiques et paléontologiques présentées dans la littérature, un modèle de reconstitution paléoenvironnementale basé sur les données de préservation des ostracodes est proposé.Une analyse critique de la qualité du jeu de données a permis d’évaluer l’influence des biais d’échantillonnage sur la représentativité du matériel fossile dans les études sur la paléobiodiversité et la paléoécologie. Les biais peuvent être corrigés par un traitement méthodologique approprié qui rend valide la comparaison des données de biodiversité. La richesse générique et spécifique décroît sensiblement au cours du Capitanien. Le passage du Permien moyen au Permien supérieur enregistre une augmentation de la richesse spécifique, malgré une faible diversité générique. L’ordre des Palaeocopida apparait ici affecté par une baisse de diversité générique et spécifique au Wuchiapingien inférieur. Si ces résultats ne permettent pas pour l’iPermiannstant de caractériser un événement global de renouvellement des communautés d’ostracodes, l’étude de matériel fossile provenant d’autres régions du monde permettra de définir l’ampleur des phénomènes observés
Ostracods, microcrustaceans (Arthropoda), are quite abundant in the fossil record. Highly dependent to palaeoenvironmental conditions, their diversity and the assemblages’ composition are good indicators of changes affecting neritic marine benthos. Ostracods are known to be deeply affected by the Permian-Triassic crisis, but their history is poorly documented for the end of Middle Permian.About10 My before the Permian-Triassic boundary, the end of Middle Permian is characterized by a major extinction episode, which could be the first step of end-Palaeozoic biodiversity drop.Systematic study carried out on Chaotian section (Sichuan Province, P.R. China) and the Penglaitan section (Guangxi Province, P.R. China) samples allowed the identification of 115 species, including seven new species. The work carried out on these two sections provides the first study of end-Middle Permian extinction event, based on the observation of ostracod assemblages.Study of carapace preservation at Penglaitan section, highlighted the end of a regression phase and the beginning of a transgression phase at the top of Middle Permian. These results are relevant with lithologic and palaeontological data from literature. Thus, a palaeoenvironmental reconstruction model has been proposed, based on ostracod preservation data.An estimation of sampling bias consequences on fossil dataset representativeness in palaeobiodiversity and palaeoecology studies was realised. These biases could be corrected by an appropriate methodology allowing comparisons of biodiversity datum. Biodiversity data reveals a decrease of generic and specific richness during Capitanian. Specific richness increased passing the Middle-Upper Permian boundary. Palaeocopida order seems here affected by a generic and specific richness decline at basal Wuchiapingian. If these results do not allow for the time being to characterize a global ostracod turnover, further studies on material from other regions in the world will allow defining the extent of the observed phenomena
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Morais, Anderson Luiz Martins de. "Ostracodes (Crustacea, Ostracoda) das praias rochosas de Santa Catarina, Brasil." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/153380.

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Os ostracodes são microcrustáceos predominantemente bentônicos que deixaram rico registro fóssil, constituindo-se em importante ferramenta para a interpretação paleoambiental e bioestratigráfica. Estudos que tratam dos ostracodes recentes são de grande importância à Paleomicrontologia, pois muitos gêneros e até mesmo espécies do Cenozoico ainda são encontrados nos mares atuais. Diversos estudos versam sobre os Ostracoda na plataforma continental e talude superior no Brasil, mas são raras as pesquisas nas águas mais rasas do infralitoral. O principal objetivo deste estudo foi identificar e ilustrar a riqueza de espécies ao longo de uma ampla área litorânea do sul do Brasil, cuja costa é formada por numerosas pequenas praias guardadas por promontórios rochosos. Discutir aspectos relacionados à zoo- e à paleozoogeografia em especial dos elementos autóctones desta ostracofauna, além de introduzir a discussão sobre a fidelidade composicional entre associação viva e morta na área de estudo, estão entre os objetivos subsequentes.Dezoito famílias, 33 gêneros e 46 espécies foram identificados nesse estudo. A família Hemicytheridae é a mais representativa com 18 espécies, seguida por Cytheruridae com seis espécies. Duas espécies do gênero Xestoleberis Sars foram identificadas como prováveis novos táxons para Xestoleberididae. Preliminarmente, a fidelidade composicional é baixa, com maior riqueza na associação morta, bem como grande dominância e baixa riqueza na associação viva, um padrão esperado para zonas marinhas rasas como o infralitoral.
Ostracoda are microcrustaceans with predominantly benthic habit which exhibit an abundant fossil record and constitute an important tool for paleoenvironmental and biostratigraphic studies. Research about recent ostracodes are extremely relevant to Paleomicrontology since many genera and even species from Cenozoic are still found nowadays. Several studies on Ostracoda from Brazil have focused on continental shelf and upper slope. The present work aims to identify and illustrate the species richness over a broad coastal area from southern Brazil, which coast is represented by numerous small sandy beaches guarded by rock promontories. Also, discuss zoo- and paleozoogeographic aspects, mainly related to autochthonous elements of this ostracofauna, and to introduce the discussion of compositional fidelity between living and dead ostracode assemblages, are among the subsequent objectives. Eighteen families, 33 genera and 46 species were identified. The family Hemicytheridae is the most representative with 18 species followed by Cytheruridae with six species. Two Xestoleberididae species herein identified are probably new taxa. A preliminary analysis showed low compositional fidelity with richness higher in death than in living assemblages. The living assemblage showed high dominance and low richness. This pattern is common for shallow marine zones such the infralittoral.
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Taha, Zardasht Ahmed. "The taxonomic, biogeographical, palaeogeographical and palaeoecological significance of the Late Ordovician Ostracod fauna of the Ellis Bay Formation, Anticosti Island, eastern Canada." Thesis, University of Leicester, 2018. http://hdl.handle.net/2381/42160.

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Ostracods form a significant component of the Late Ordovician fossil fauna of the Ellis Bay Formation, Anticosti Island, Canada. Sixty-two ostracod species are identified, belonging to 36 genera. These include 14 species described as new, and 13 species described in open nomenclature. The ostracod fauna reveals new and important data bearing on the biostratigraphical, palaeogeographical and palaeoecological significance of the Ellis Bay Formation. The stratigraphic distribution of the ostracods permits the recognition of four successive intervals: (A) the Longiscula subcylindrica Biozone, (B) the Eurychilina erugoface Biozone, (C) the Tetradella anticostiensis Biozone and (D) an Interregnum. Stratigraphical intervals A, B and D can be related to Copeland’s (1973) ostracod biozonation for the Ellis Bay Formation. Biozone C is equivalent to three of Copeland’s (1973) ostracod sub-zones. Presence/absence analysis of the ostracod distribution patterns in the Ellis Bay Formation identifies two palaeoecologically discrete assemblages: an open marine assemblage characterises most of the formation (lithostratigraphical members 1 to 6); whilst a lower diversity assemblage typifies the uppermost Member 7. Biogeographically, the Ellis Bay Formation ostracod fauna is typically North American (Laurentian), but also shares affinities with the Late Ordovician ostracod assemblages of palaeocontinental Baltica and Avalonia.
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Arenz, Alexis. "Behavioral Patterns of Blinded vs. Mock-blinded Male Individuals in the Presence of Females: Analysis of the Role of Eyes in Euphilomedes carcharodonta Mating." Scholarly Commons, 2018. https://scholarlycommons.pacific.edu/uop_etds/3108.

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Sexual dimorphism is exhibited throughout various organisms and takes an extensive variety of forms, although rarely does it take the form of eye-reduction within a population. This poses the question of whether this dimorphism arises due to sexual selection in order to increase reproductive success or rather from ecological selection as a result of sex-specific niche partitioning. In this case, we study an organism that displays a drastic form of sexual dimorphism, in that the males have large complex lateral eyes whereas the females lack eyes and merely have rudimentary lateral eye-spots. Euphilomedes carcharodonta is a small crustacean native to the coast of California. Studies on the dimorphism between these individuals have mainly been related to genetics and embryology. However, minimal studies have been performed questioning the evolutionary driving force behind their dimorphism. One study suggests that this driving force is ecological selection, more specifically, predator evasion as a result of the reproductive role hypothesis. In this study, we focus on sexual selection as a driving force and ask whether the eyes play a role in the ability of males to find mates. We blinded and mock-blinded male individuals, placed them in tank settings with females in the absence of predators, and observed their behavior. If sexual selection is involved in the eye development of males, we expected to see changes in male and/or female behavior in response to obstructing the vision of the males. We did not see changes in behavior of the males or the females. This leads us to conclude that the development of complex eyes in male Euphilomedes carcharodonta arises from ecological selection rather than sexual selection. With the previous work on predator evasion, these experiments and findings are the first to experimentally test the reproductive role hypothesis and are the beginning steps for further behavioral studies of these organisms and in discovering more about the unique dimorphism exhibited by Euphilomedes carcharodonta.
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Books on the topic "Ostracod"

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J, Siveter David, and Athersuch J, eds. A stereo-atlas of ostracod shells. London: British Micropalaeontological Society, 1989.

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Williams, Mark. A stereo-atlas of ostracod shells. London: British Micropalaeontological Society, 1989.

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J, Siveter David, and Athersuch J, eds. A stereo-atlas of ostracod shells. London: British Micropalaeontological Society, 1989.

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Williams, Mark. A stereo-atlas of ostracod shells. London: British Micropalaeontological Society, 1989.

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J, Siveter David, and Athersuch J, eds. A stereo-atlas of ostracod shells. London: British Micropalaeontological Society, 1989.

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Williams, Mark. A stereo-atlas of ostracod shells. London: British Micropalaeontological Society, 1989.

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J, Siveter David, and Athersuch J, eds. A stereo-atlas of ostracod shells. London: British Micropalaeontological Society, 1989.

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J, Siveter David, and Athersuch J, eds. A stereo-atlas of ostracod shells. London: British Micropalaeontological Society, 1989.

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Williams, Mark. A stereo-atlas of ostracod shells. London: British Micropalaeontological Society, 1989.

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Williams, Mark. A stereo-atlas of ostracod shells. London: British Micropalaeontological Society, 1989.

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Book chapters on the topic "Ostracod"

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De Deckker, Patrick. "Ostracod palaeoecology." In The Ostracoda: Applications in Quaternary Research, 121–34. Washington, D. C.: American Geophysical Union, 2002. http://dx.doi.org/10.1029/131gm06.

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Holmes, Jonathan A., and Allan R. Chivas. "Ostracod shell chemistry — overview." In The Ostracoda: Applications in Quaternary Research, 185–204. Washington, D. C.: American Geophysical Union, 2002. http://dx.doi.org/10.1029/131gm10.

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Smith, Robin J., and Koen Martens. "The ontogeny of the cypridid ostracod Eucypris virens (Jurine, 1820) (Crustacea, Ostracoda)." In Evolutionary Biology and Ecology of Ostracoda, 31–63. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-1508-9_3.

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Kristan-Tollmann, Edith. "Pandemic ostracod communities in the Tethyan Triassic." In Ostracoda and Global Events, 541–44. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1838-2_42.

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Martens, Koen. "On a remarkable South African giant ostracod (Crustacea, Ostracoda, Cyprididae) from temporary pools, with additional appendages." In Aquatic Biodiversity, 115–30. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-1084-9_8.

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Boomer, Ian, and Gary Eisenhauer. "Ostracod faunas as palaeoenvironmental indicators in marginal marine environments." In The Ostracoda: Applications in Quaternary Research, 135–49. Washington, D. C.: American Geophysical Union, 2002. http://dx.doi.org/10.1029/131gm07.

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Chivas, Allan R., Patrick De Deckker, Sue X. Wang, and Joseph A. Cali. "Oxygen-isotope systematics of the nektic ostracod Australocypris robusta." In The Ostracoda: Applications in Quaternary Research, 301–13. Washington, D. C.: American Geophysical Union, 2002. http://dx.doi.org/10.1029/131gm16.

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Qiqing, Pang, and Robin Whatley. "The biostratigraphical sequence of Mesozoic non-marine ostracod assemblages in northern China." In Ostracoda and Global Events, 239–50. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1838-2_18.

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Braun, Willi K. "Devonian ostracod faunas of western Canada: their evolution, biostratigraphical potential and environmental settings." In Ostracoda and Global Events, 59–70. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1838-2_4.

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Günther, Jutta. "Ostracod fauna of Duvensee, an ancient lake in Northern Germany." In Paleolimnology IV, 411–16. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-4047-5_55.

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Conference papers on the topic "Ostracod"

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Carrier, Agathe E., and Achim D. Herrmann. "OSTRACOD CARAPACE GEOCHEMISTRY: LASER OPTIMIZATION AND PALEOENVIRONMENTAL RECONSTRUCTION." In 50th Annual GSA South-Central Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016sc-273900.

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Briceag, Andrei. "SHALLOW AND DEEP MARINE OSTRACOD ASSEMBLAGES FROM NW BLACK SEA." In 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings. STEF92 Technology, 2019. http://dx.doi.org/10.5593/sgem2019/1.1/s01.063.

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Chad, J., P. Malsalla, and J. J. Novosad. "Foam Forming Surfactants In Pembina/Ostracod 'G' Pool." In Annual Technical Meeting. Petroleum Society of Canada, 1988. http://dx.doi.org/10.2118/88-39-40.

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KOBAYASHI, KOJI, YOSHIHIRO OHMIYA, DAISAKU SHINOHARA, YOSHIHIRO OHMIYA, TAKUJI NABETANI, and HARUKI NIWA. "PURIFICATION AND PROPERTIES OF THE LUCIFERASE FROM THE MARINE OSTRACOD Vargula hilgendorfii." In Proceedings of the 11th International Symposium. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812811158_0022.

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Darbas, Guldemin. "STRATIGRAPHY AND OSTRACOD ASSEMBLAGES OF THE CAMELI FORMATION, DALAMAN-GOCEK (MUGLA-SW TURKEY)." In 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017/11/s01.067.

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Yudin, Alexey, Mohamed ElSebaee, Vladimir Stashevskiy, Abdullah Al Baik, Ahmed AlJanahi, Sayed Abdelrady, Saeed Darwish, and Nasser Al Askari. "Novel Approach to Height Growth Control Rejuvenates Ostracod Formation's Potential with Massive Fracturing." In Abu Dhabi International Petroleum Exhibition & Conference. Society of Petroleum Engineers, 2020. http://dx.doi.org/10.2118/203420-ms.

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Koetter, Sabrina, Haley Brumberger, Christina N. Cauley, Ellen Thomas, and Johan C. Varekamp. "THE OSTRACOD RECORD IN PAULINA LAKE, OREGON: ENVIRONMENTAL HISTORY OF A VOLCANIC CRATER LAKE." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-340225.

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Fernandes Martins, Maria Joao, Ana Gomes, David Nora, Simon Connor, Elena Skosey-LaLonde, Brandon Zinsious, Mussa Raja, et al. "INSIGHT INTO LATE HOLOCENE CLIMATE CHANGE IN MOZAMBIQUE: OSTRACOD, GEOCHEMICAL AND GRAIN-SIZE PRELIMINARY RESULTS." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-355776.

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Brumberger, Haley, Sabrina Koetter, Christina N. Cauley, Johan C. Varekamp, and Ellen Thomas. "RESILIENCE OF LIFE IN A VOLCANIC LAKE: THE OSTRACOD RECORD OF PAULINA LAKE, NEWBERRY VOLCANO, OR." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-357363.

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O'Brien, Margaret Massie, Catherine C. Beck, and Linda Martin. "OSTRACOD ASSEMBLAGE ANALYSIS FOR PALEOENVIRONMENTAL RECONSTRUCTION FROM THE PLEISTOCENE TO HOLOCENE TURKWEL CLIFF, WEST TURKANA, KENYA." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-320085.

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Reports on the topic "Ostracod"

1

Ascoli, P. Mesozoic-Cenozoic foraminiferal, ostracod and calpionellid zonation of the north Atlantic margin of North America: Georges Bank-Scotian basins and northeastern Grand Banks [Jeanne d'Arc, Carson and Flemish Pass basins] and biostratigraphic correlation of 51 wells. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/130500.

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Rodriques, C. G. Ostracode stratigraphy of Lake Winnipeg sediments. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/207516.

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Copeland, M. J. Ordovician Ostracoda from southern Baffin Island, Nunavut. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2000. http://dx.doi.org/10.4095/211848.

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Copeland, M. J. New occurrences of kolmodinia martinsson [ostracoda] from the silurian [wenlock] of the. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120254.

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Banerjee, I., and I. Raychaudhuri. Paleoenvironmental significance of biota of the Ostracode zone (Mannville Group) in south-central Alberta. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/207880.

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Copeland, M. J. Early Silurian ostracodes from southeastern Quebec and northern New Brunswick. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/193321.

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Copeland, M. J. Middle Devonian (Givetian, Hamilton Group) Ostracoda in two diamond drill cores from Lambton County, southwestern Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1999. http://dx.doi.org/10.4095/210869.

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Copeland, M. J. Silicified Upper Ordovician-Lower Silurian ostracodes from the Avalanche Lake area, southwestern District of Mackenzie. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127317.

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Copeland, M. J. Bullaluta Kindlei N. Gen., N. Sp. [Ostracoda, Archaeocopida] From Zone 5 [Late Cambrian, CedariaCrepicepha of the Cow Head Group, western Newfoundland. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/120785.

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Riediger, C. L., and I. Banerjee. Rock-eval/TOC data from the Lower Cretaceous Ostracode Zone (Mannville Group), Calcareous Member (Gladstone Formation) and Moosebar Formation, Alberta, Western Canada Sedimentary Basin. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/184203.

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