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Journal articles on the topic 'Operculum morphology'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Checa, Antonio G., and Antonio P. Jiménez-Jiménez. "Constructional morphology, origin, and evolution of the gastropod operculum." Paleobiology 24, no. 1 (1998): 109–32. http://dx.doi.org/10.1017/s0094837300020005.

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Gastropod opercula are classified here on a new morphogenetic basis, which distinguishes three main types: (1) flexiclaudent spiral (mostly multispiral) operculum, the shape of which does not coincide with that of the aperture, (2) rigiclaudent spiral (usually paucispiral) operculum, the shape of which fits that of the aperture, and (3) rigiclaudent concentric operculum, also aperture-fitting. The first type fits by flexing into the aperture and is secreted when the soft parts are partly or wholly extended (i.e., when the operculum is not in a closed position). The other two types do not flex

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MARKOVIĆ, VANJA, VUKICA VUJIĆ, MARIJA ILIĆ, JELENA TOMOVIĆ, VERA NIKOLIĆ, and TAMARA KARAN-ŽNIDARŠIČ. "Operculum shape variation in Theodoxus Montfort, 1810 (Gastropoda: Neritidae)." Zootaxa 4560, no. 3 (2019): 563. http://dx.doi.org/10.11646/zootaxa.4560.3.8.

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The operculum morphology of neritid snails of genus Theodoxus Montfort, 1810 yields important species-specific taxonomic characters. This study is the first attempt to describe morphological differences in snails based on operculum shapes using a geometric morphometric approach. We examined the variability of opercular shapes between sexes and among populations and species based on 91 opercula of adult specimens belonging to six populations of three species of Theodoxus from the central Balkan and the southern border of the Pannonian plain. There are no sex-related differences in operculum sha

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Tetlie, O. Erik, and Simon J. Braddy. "The first Silurian chasmataspid, Loganamaraspis dunlopi gen. et sp. nov. (Chelicerata: Chasmataspidida) from Lesmahagow, Scotland, and its implications for eurypterid phylogeny." Transactions of the Royal Society of Edinburgh: Earth Sciences 94, no. 3 (2003): 227–34. http://dx.doi.org/10.1017/s0263593300000638.

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ABSTRACTA new chasmataspid (Chelicerata: Chasmataspidida) is described from the Early Silurian (Late Llandovery–Early Wenlock) of Lesmahagow, Scotland, as Loganamaraspis dunlopi gen. et sp. nov. It is distinguished from related forms by the low tapering ratio of the postabdomen, pediform sixth prosomal appendage and a heart-shaped metastoma. Additionally, a genital operculum with a genital appendage is preserved. The recognisable morphology of L. dunlopi gen. et sp. nov. bridges some of the gap between the Ordovician Chasmataspididae and the Devonian Diploaspididae. Traces of the gut are repor

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Powell, Jonathan M., Laura J. Nixon, Austin P. Lourie, Tracy C. Leskey, and Spencer S. Walse. "Egg Morphology and Chorionic Ultrastructure of Spotted Lanternfly, Lycorma delicatula (White) (Hemiptera: Fulgoridae)." Forests 14, no. 12 (2023): 2354. http://dx.doi.org/10.3390/f14122354.

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Knowledge regarding egg morphology can aid the selection of postharvest fumigants for insect control. Accordingly, scanning electron microscopy (SEM) was used to examine eggs of spotted lanternfly (SLF), Lycorma delicatula (White) (Hemiptera: Fulgoridae), a pest recently invasive to the mid-Atlantic region of the United States. As the overwintering life stage of SLF, eggs are deposited on a variety of refugia, including many forestry products that can be distributed geographically via travel, commerce, and/or trade. For fumigation to control SLF, and potentially translate into a viable strateg

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Quan, Y., X. J. Gao, J. Liu, et al. "Variability of vestibular aqueduct measurements among axial, single-oblique and double-oblique computed tomography images." Journal of Laryngology & Otology 132, no. 10 (2018): 875–80. http://dx.doi.org/10.1017/s0022215118001597.

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AbstractObjectiveTo investigate the morphology and dimensions of the vestibular aqueduct on axial, single-oblique and double-oblique computed tomography images.MethodsThe computed tomography temporal bone scans of 112 patients were retrospectively evaluated. Midpoint and opercular measurements were performed using axial, single-oblique and double-oblique images. Morphometric analyses were also conducted. The vestibular aqueduct sizes on axial, single-oblique and double-oblique images were compared.ResultsAt the midpoint, the mean (± standard deviation) vestibular aqueduct measured 0.61 ± 0.23

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kumar, Sunil, Virendra Kumar, and Manish Maheshwari. "EFFECTS OF LEAD ACETATE ON RESPIRATORY BEATS AND OPERCULUM ACTIVITIES OF SNAKEHEAD FISH, CHANNA PUNCTATUS." Journal of Science Innovations and Nature of Earth 3, no. 2 (2023): 17–19. http://dx.doi.org/10.59436/https://jsiane.com/archives3/2/77.

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Channa punctatus, a species of freshwater fish, was subjected to an experiment to measure the effects of lead acetate on its morphology, respiratory rate, and operculum activity. The fish in the experiment were dosed with lead acetate, which might have entered their bodies through their gills, skin, or digestive systems. Lead acetate was shown to have accumulated on the gills, operculum, morphology, and respiratory rate of the cichlid fish Channa punctatus. Fishes are particularly vulnerable to the accumulation of heavy metals in fresh water since they are the top consumer in aquatic systems.

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Do, Duc Sang, and Thanh Son Nguyen. "A new genus and new species of Pupinidae(Gastropoda: Caenogastropoda) from Northern Vietnam." Ruthenica, Russian Malacological Journal 33, no. 1 (2023): 19–26. http://dx.doi.org/10.35885/ruthenica.2023.33(1).3.

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Chuatienpupa megacanalis gen. et sp. nov. is described from Hoa Binh province, northern Vietnam. Chuatienpupa gen. nov. is characterized by a small, pupoid-shaped, smooth, glossy shell. Peristome with two canals; anterior canal twisted funnel-shaped, appearing as a very wide groove, opening on the basal side; posterior canal continues vertically upward and forming a wide groove, which is divided by the upper palatal plica. The operculum bowl-shaped, strongly convex, its outer surface smooth, glossy, and covered by a glaze. Both shell and opercular characters distinguish this new genus from oth

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8

Anderson, DT, and JT Anderson. "Functional morphology of the balanomorph barnacles Tesseropora rosea (Krauss) and Tetraclitella purpurascens (Wood) (Tetraclitidae)." Marine and Freshwater Research 36, no. 1 (1985): 87. http://dx.doi.org/10.1071/mf9850087.

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Tesseropora rosea of eastern Australia inhabits exposed, wave-washed rocks, is an extension feeder in fast currents, and has monometric growth, with orifice enlargement by erosion. It has a deep, mobile operculum. Tergal depressor muscles are large, scutal depressors moderately large. The opercular valves play an active part in respiratory pumping beat. Tergal depressors effect opercular withdrawal. Rostral scutal depressors assist in pumping beat. Lateral scutal depressors assist in opercular opening. Cim IV-VI of T. rosea unfurl rapidly in response to fast water currents and are captorial, e

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9

Yochelson, Ellis L. "Billings' second operculum: a late Early Ordovician Maclurites (Gastropoda) from western Newfoundland and the Canadian Arctic." Canadian Journal of Earth Sciences 27, no. 5 (1990): 669–76. http://dx.doi.org/10.1139/e90-064.

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An operculum of Maclurites, first described by Billings in 1865, is redescribed from the original material collected at Cape Norman, northwestern Newfoundland, and from additional specimens from Ellesmere Island, Canadian Arctic. Based on indirect evidence, a very late to latest Early Ordovician age is assigned to the strata of the St. George Group that contains this fossil. This operculum has a paleoequatorial distribution. On the basis of its geometry, the operculum is interpreted as having a "concentric" growth pattern rather than a spiral one. If so, the complex coiling pattern assumed for

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Mason, Matthew J., and Peter M. Narins. "Vibrometric studies of the middle ear of the bullfrogRana catesbeianaII. The operculum." Journal of Experimental Biology 205, no. 20 (2002): 3167–76. http://dx.doi.org/10.1242/jeb.205.20.3167.

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SUMMARYThe operculum and stapes footplate, the two moveable elements within the oval window of the frog, have been thought to function independently. In this study, laser interferometry was used to record the vibrations of both structures in response to free-field airborne sound. Contrary to expectation,the operculum appears to be coupled to the footplate. Coupling is achieved both by means of ligaments and by a cartilaginous flange of the footplate that underlies the operculum. The stapes footplate rotates about an axis located ventrolaterally, but the axis for the operculum is dorsomedial. A

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Liu, Fan, Christian B. Skovsted, Timothy P. Topper, and Zhifei Zhang. "A fresh look at the Hyolithid Doliutheca from the Early Cambrian (Stage 4) Shipai Formation of the Three Gorges Area, Hubei, South China." Biology 11, no. 6 (2022): 875. http://dx.doi.org/10.3390/biology11060875.

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New hyolith specimens from the early Cambrian (Stage 4) of the Three Gorges area, western Hubei Province are described and assigned to the species Doliutheca orientalis. Doliutheca are preserved in two taphonomic modes: casts in silty mudstone revealing gross morphology and some soft parts, and internal molds in calcareous pelites, which exhibit new morphological details of the conch and operculum. SEM and Micro-CT analyses show that Doliutheca preserve well-developed platy clavicles and cardinal processes on the interior of the operculum composed of rod-shaped tubular elements. This observati

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DOĞAN, CAHİT, and SEDAT ÖMER ERDEM. "Pollen morphology of some Arenaria taxa (Caryophyllaceae)." Phytotaxa 351, no. 1 (2018): 29. http://dx.doi.org/10.11646/phytotaxa.351.1.2.

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Palynological characteristics of 11 taxa belonging to the genus Arenaria (Caryophyllaceae) have been examined. Pollen grains in the pollen slides, which were prepared according to the method of acetolysis, morphological features were determined with light microscope and also with SEM, then microphotographs of pollens were taken. Morphological examinations were performed on the part of the work carried out with light microscope, pollen sizes, pore sizes and numbers were observed to vary between taxa. The pollen type of the studied taxa is pantoporate (periporate), pollen shape is prolate sphero

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DOĞAN, CAHİT, and SEDAT ÖMER ERDEM. "Pollen morphology of some Arenaria taxa (Caryophyllaceae)." Phytotaxa 351, no. 1 (2018): 29. http://dx.doi.org/10.11646/hytotaxa.351.1.2.

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Palynological characteristics of 11 taxa belonging to the genus Arenaria (Caryophyllaceae) have been examined. Pollen grains in the pollen slides, which were prepared according to the method of acetolysis, morphological features were determined with light microscope and also with SEM, then microphotographs of pollens were taken. Morphological examinations were performed on the part of the work carried out with light microscope, pollen sizes, pore sizes and numbers were observed to vary between taxa. The pollen type of the studied taxa is pantoporate (periporate), pollen shape is prolate sphero

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NISHI, EIJIROH, ELENA KUPRIYANOVA, and HIROYUKI TACHIKAWA. "Metavermilia ogasawaraensis sp. nov. (Serpulidae: Sabellida: Polychaeta: Annelida) from deep-sea locations off Ogasawara Island, Japan with a literature overview of the genus." Zootaxa 1447, no. 1 (2007): 47–56. http://dx.doi.org/10.11646/zootaxa.1447.1.3.

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A new species of the genus Metavermilia Bush, 1905 (Annelida, Polychaeta, Serpulidae) is described from deep-water locations (1600–1700 m) off Ogasawara Islands, Japan. The genus Metavermilia is characterized by a single synapomorphy, the structure of the opercular stalk (flat and ribbon-like) formed from the second dorsal branchial radiole. The Metavermilia ogasawaraensis n. sp., is most similar morphologically to M. nanshaensis in having a simple conical operculum covered with a brownish distal plate with a tubercle in the middle and short thoracic membranes. The two species differ from each

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SANDOVAL, CLAUDIA M., ELSA NIEVES, VÍCTOR M. ANGULO, JOÃO ARISTEU DA ROSA, and ELIS ALDANA. "Morphology of the eggs of the genus Belminus (Hemiptera: Reduviidae: Triatominae) by optical and scanning electron microscopy." Zootaxa 2970, no. 1 (2011): 33. http://dx.doi.org/10.11646/zootaxa.2970.1.2.

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The external morphology of eggs of the species Belminus corredori Galvão & Angulo, 2006, Belminus herreri Lent & Wygodzinsky, 1979 and Belminus ferroae Sandoval, Pabón, Jurberg & Galvão, 2007 is described for the first time using scanning electron microscopy (SEM). Females lay one egg at a time; the shape of the egg is oval with lateral flattening, a rounded caudal area and a true and simple convex operculum. The average size of the egg among these species is 0.51– 0.58 mm in length and 0.36–0.4 mm in width. As a generic character we highlight the discovery of a chorion rim with on

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Alba, David M., Alonso Jordi Corbella, Mestre Glòria Guillén, Pi Lluis Prats, and Ruestes Antoni Tarruella. "Presence of two different species of Theodoxus Montfort, 1810 (Gastropoda: Neritidae) in Catalonia." Spira 6, no. 1-2 (2016): 41–65. https://doi.org/10.5281/zenodo.8279126.

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Presence of two different species of Theodoxus Montfort, 1810 (Gastropoda: Neritidae) in Catalonia.—It is currently considered that a single species of Theodoxus (Gastropoda: Neritidae), Theodoxus fluviatilis, is present in Catalonia. Here we report the presence of another species, distinct from T. fluviatilis, in two localities from el Montsià (province of Tarragona, Catalonia, Spain). We tentatively assign these populations to Theodoxus cf. meridionalis, a species that, until recently, was considered to be restricted to Sicily and North Africa. Most recently, it has been conclud

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DA SILVA, HÉLIO R., LEANDRO AMBRÓSIO CAMPOS, and ANTONIO SEBBEN. "The auditory region of Brachycephalus and its bearing on the monophyly of the genus (Anura: Brachycephalidae)." Zootaxa 1422, no. 1 (2007): 59–68. http://dx.doi.org/10.11646/zootaxa.1422.1.4.

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We surveyed the morphology of the auditory region of members of the anuran genus Brachycephalus. The sample included seven of the eleven known species; in addition, Brachycephalus ephippium and B. vertebralis were each represented by several specimens from different localities. All species lack a tympanum, tympanic annulus, stapes, and Eustachian tube. However, the operculum and the m. opercularis remain. The large operculum bears a robust process for the m. opercularis and covers most of the fenestra ovalis. The auditory apparatus of Brachycephalus is distinguished by the large size and the o

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Nazish, Moona, and Ashwaq T. Althobaiti. "Palyno-Morphological Characteristics as a Systematic Approach in the Identification of Halophytic Poaceae Species from a Saline Environment." Plants 11, no. 19 (2022): 2618. http://dx.doi.org/10.3390/plants11192618.

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Pollen morphology of 12 salt-tolerant grasses (Calamagrostis pseudophragmites, Cenchrus biflorus, Cenchrus ciliaris, Cenchrus pennisetiformis, Cymbopogon jwarancusa, Dactyloctenium aegyptium, Echinochloa colona, Echinochloa crus-galli, Saccharum griffithii, Saccharum ravennae, Saccharum spontaneum, and Urochloa ramosa) from the Salt Range was studied using scanning electron microscopy (SEM) and light microscopy (LM). The main aim was the elucidation of taxonomic significance of pollen morphology, which might be useful for taxonomists in the identification of halophytic Poaceae taxa. The descri

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Li, Luoyang, Christian B. Skovsted, Hao Yun, Marissa J. Betts, and Xingliang Zhang. "New insight into the soft anatomy and shell microstructures of early Cambrian orthothecids (Hyolitha)." Proceedings of the Royal Society B: Biological Sciences 287, no. 1933 (2020): 20201467. http://dx.doi.org/10.1098/rspb.2020.1467.

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Hyoliths (hyolithids and orthothecids) were one of the most successful early biomineralizing lophotrochozoans and were a key component of the Cambrian evolutionary fauna. However, the morphology, skeletogenesis and anatomy of earliest members of this enigmatic clade, as well as its relationship with other lophotrochozoan phyla remain contentious. Here, we present a new orthothecid, Longxiantheca mira gen. et sp. nov. preserved as part of secondarily phosphatized small shelly fossil assemblage from the lower Cambrian Xinji Formation of North China. Longxiantheca mira retains some ancestral trai

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Allsay, Kitsash Addifisyukha Cintra, and Eny Djoko Setyono Dwi. "Shell morphology and size distribution of Turbo spp in Sepanjang Beach by shell collecting: An Initial Survey." BIO Web of Conferences 70 (2023): 03003. http://dx.doi.org/10.1051/bioconf/20237003003.

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Turbo spp. in Sepanjang Beach, Gunung Kidul, Indonesia, are at risk of depletion due to their popularity for consumption and decoration. Protecting this species demands sustainable management practices. This initial survey aimed to examine the shell morphology, size distribution, and shell growth patterns of Turbo spp. at Sepanjang Beach, Indonesia, to establish baseline data for future research. A total of 233 shells were collected randomly and analyzed for morphological parameters. Shell dimensions exhibited variations in size, shape, color, and whorl features. Shells ranged from 7.59 to 60.

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Barthélémy, Roxane-M., Corinne Cuoc, Danielle Defaye, Michel Brunet, and Jacques Mazza. "Female genital structures in several families of Centropagoidea (Copepoda: Calanoida)." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 353, no. 1369 (1998): 721–36. http://dx.doi.org/10.1098/rstb.1998.0238.

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The female genital structures of 21 calanoid species belonging to the families Candaciidae, Centropagidae, Pontellidae, Sulcanidae, Temoridae and Tortanidae were studied using light and electron microscopy (scanning electron microscopy, transmission electron microscopy). Except the monotypic Sulcanidae, their organization conforms to a common pattern characterized by egg–laying ducts opening through paired adjacent gonopores into a small cavity, the genital atrium, covered by a genital operculum and opening to the outside through a distal atrial slit. No seminal receptacle is present and the s

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Silva, Themis Jesus, Emerson Carlos Soares, Graça Casal, et al. "Ultrastructure of phagocytes and oocysts of Nematopsis sp. (Apicomplexa, Porosporidae) infecting Crassostrea rhizophorae in Northeastern Brazil." Revista Brasileira de Parasitologia Veterinária 28, no. 1 (2019): 97–104. http://dx.doi.org/10.1590/s1984-29612019010.

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Abstract This work describes the detailed ultrastructural morphology of the phagocyte imprisoning an oyster of Nematopsis (Apicomplexa) found in Crassostrea rhizophorae, in the city of Maceió (AL), Brazil. The highly infected hosts had half-open leaflets with weak, slow retraction of the adductor muscles. Variable number of ellipsoid oocytes, either isolated and or clustered, was found between myofibrils of the adductor muscle. Each oocyst was incarcerated in a parasitophorous vacuole of host uninucleated phagocyte. The oocysts were composed of a dense wall containing a uninucleate vermiform s

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Gaviria, Santiago, and Danielle Defaye. "Description of Elaphoidella paramuna n. sp. (Canthocamptidae), a new harpacticoid copepod from Colombia." Crustaceana 88, no. 9 (2015): 1003–29. http://dx.doi.org/10.1163/15685403-00003464.

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A new species of harpacticoid copepod was discovered on submerged mosses of a high Andean lake in Colombia. The diagnostic characters of the male and female canthocamptidElaphoidella paramunan. sp. are based on the chaetotaxy of legs 1 to 4, morphology of leg 5, armature of anal urosomite, size and armature of anal operculum and morphology, armature and ornamentation of caudal rami. It belongs to the group X of Lang (1948); its relationships withElaphoidella pectinata,E. armataandE. brevifurcataare discussed. The 35 species and subspecies ofElaphoidellaknown in the Neotropical region are assig

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Marzouk, Ream I., Salama M. El-Darier, and Abdel Baset M. Askar. "Pollen morphology of Teucrium L. (Lamiaceae, Ajugoideae) in Libya." Bangladesh Journal of Plant Taxonomy 24, no. 2 (2017): 219–26. http://dx.doi.org/10.3329/bjpt.v24i2.35118.

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Pollen grains of 11 taxa of Teucrium from Libya were examined using lightmicroscopy (LM) and scanning electron microscopy (SEM) in order to provide better insight on the evaluation of palynological attributes for species characterization of Teucrium with special emphasis on the five Libyan endemic. Two main pollen shapes were documented; subprolate and prolate or perprolate in T. fruticans. The exine sculpture inspected at surface, operculum and pole were mostly verrucate, perforate or scabrate. Teucrium fruticans attained the phenomenon of pollen dimorphism with two distinct shapes and specif

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Ribas, Guilherme Carvalhal, Eduardo Carvalhal Ribas, and Consuelo Junqueira Rodrigues. "The anterior sylvian point and the suprasylvian operculum." Neurosurgical Focus 18, no. 6 (2005): 1–6. http://dx.doi.org/10.3171/foc.2005.18.6.15.

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Object The sylvian fissure or lateral sulcus is the most identifiable feature of the superolateral brain surface and constitutes the main microneurosurgical corridor, given the high frequency of approachable intracranial lesions through this route. The anterior sylvian point (ASyP) divides this fissure in its main anterior and posterior rami and was evaluated in this study for its morphology, exact location, and sulcal and neural relationships to assess its suitability as an initial, visually identifiable landmark for further neuroimaging and intraoperative estimation of its adjoining suprasyl

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Brandão, Ivison Cordeiro, and Ana Claudia dos Santos Brasil. "On a new species of Spirobranchus Blainville, 1818 (Annelida: Serpulidae) and considerations on the genus along the Brazilian coast." Papéis Avulsos de Zoologia 60 (October 20, 2020): e20206051. http://dx.doi.org/10.11606/1807-0205/2020.60.51.

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Spirobranchus are abundant and diverse serpulids in tropical regions, with three species reported in Brazil, which occurrence is questionable, due to their distant type localities. In the present work, we describe a new species of Spirobranchus from the Brazilian coast and report the other species of the genus occurring off Brazilian shoreline, based on specimens from different locations. Specimens were collected in the states of Alagoas, Rio de Janeiro, and Santa Catarina, sorted and analyzed under a stereoscopic microscope. Then, the animals were anesthetized and subsequently fixed and prepa

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Brooker, MIH, AFM Barton, BA Rockel, and J. Tjandra. "The Cineole Content and Taxonomy of Eucalyptus kochii Maiden & Blakely and E. plenissima (Gardner) Brooker, With an Appendix Establishing These Two Taxa as Subspecies." Australian Journal of Botany 36, no. 2 (1988): 119. http://dx.doi.org/10.1071/bt9880119.

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The nomenclatural history and comparative morphology of Eucalyptus kochii Maiden & Blakely and E. plenissima (Gardner) Brooker are discussed. Studies on the oils of Western Australian eucalypts are surnmarised. Populations from various locations within the distributions of both taxa were subjected to rnorphornetric analyses and studied for the components and seasonality of oil production. The two taxa established herein as subspecies, viz. E. kochii subsp. kochii and E. kochii subsp. plenissima, differ in operculum shape and cineole production, and have separate distributions.

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PINZÓN M., CONCHITA, BRITTANY DAMRON, and RICARDO PINTO-DA-ROCHA. "Three new species of Cosmetidae C.L. Koch, 1839 from South America (Opiliones: Cosmetidae)." Zootaxa 4984, no. 1 (2021): 203–17. http://dx.doi.org/10.11646/zootaxa.4984.1.16.

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Three new species of harvestmen are described based on morphology. Taito mayoruna spec. nov. from Jenaro Herrera province, Loreto, Peru is differentiated from other species of Taito Kury & Barros, 2014 by features such as anal operculum armed, and femur IV with two retro-distal spines. Taito curupira spec. nov. from Porto Velho, Rondonia, Brazil is recognized by an H-shaped color pattern, femur IV curved dorsally and armed with medial prolateral and retrolateral tubercles. A third species herein described, Eulibitia chacuamarei spec. nov., from Trinidad, Casanare, Colombia is distinguished

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Foundas, Anne L., Alec Weisberg, Cassandra A. Browning, and Daniel R. Weinberger. "Morphology of the Frontal Operculum: A Volumetric Magnetic Resonance Imaging Study of the Pars Triangularis." Journal of Neuroimaging 11, no. 2 (2001): 153–59. http://dx.doi.org/10.1111/j.1552-6569.2001.tb00026.x.

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Fraser, M. R., and R. de Nys. "The morphology and occurrence of jaw and operculum deformities in cultured barramundi (Lates calcarifer) larvae." Aquaculture 250, no. 1-2 (2005): 496–503. http://dx.doi.org/10.1016/j.aquaculture.2005.04.067.

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Zhang, Le-Jia, Li-Na Du, and Thomas von Rintelen. "A new genus of river snails, Dalipaludina (Gastropoda, Viviparidae), endemic to the Yunnan Plateau of SW China." Zoosystematics and Evolution 99, no. 2 (2023): 285–97. http://dx.doi.org/10.3897/zse.99.102586.

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A new genus of viviparid snail, Dalipaludinagen. nov., from the Yunnan Plateau of China is described within an integrative taxonomic framework based on data from the mitochondrial COI marker and morphology. Dalipaludina can be distinguished from all other viviparid genera by a unique combination shell, operculum and radula characters. Four species are assigned here to the new genus, Dalipaludina delavayanacomb. nov., Dalipaludina oxytropoidescomb. nov., Dalipaludina occidentaliscomb. nov., and Dalipaludina pyramidellacomb. nov., and one species is newly assigned to Margarya, Margarya dianchien

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GORDON, DENNIS P., KJETIL L. VOJE, and PAUL D. TAYLOR. "Living and fossil Steginoporellidae (Bryozoa: Cheilostomata) from New Zealand." Zootaxa 4350, no. 2 (2017): 345. http://dx.doi.org/10.11646/zootaxa.4350.2.9.

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The cheilostome bryozoan family Steginoporellidae in New Zealand comprises seven living species of Steginoporella. Three of these are new to science—Steginoporella discors n. sp., Steginoporella lineata n. sp. and Steginoporella modesta n. sp.—and one (Steginoporella magnifica) additionally occurs as a Plio-Pleistocene fossil. A new Early Pleistocene fossil species, Steginoporella tiara n. sp., is also recognised. The living species exhibit the full range of colonial morphologies known for the genus, and two of the new deep-shelf taxa described herein have the smallest known colonies, both lin

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Wrońska-Pilarek, Dorota, and Krystyna Boratyńska. "Pollen morphology of Rosa gallica L. (Rosaceae) from Southern Poland." Acta Societatis Botanicorum Poloniae 74, no. 4 (2011): 297–304. http://dx.doi.org/10.5586/asbp.2005.038.

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The morphology of pollen grains of <em>Rosa gallica</em> was studied on the basis of material from 15 natural localities in southern Poland. It was ascertained that the diagnostic features of pollen grains of <em>R. gallica</em> were: the presence of deep, often Y-shaped striae in a linear arrangement; numerous perforations of various, rather big diameters on the bottom of striae; the occurrence of operculum on the membrane of ectocolpus; the presence of costae ectocolpi and fastigium in the area of endopori. The most significant differences among the particular samples

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Martí Mus, Mónica, Lennart Jeppsson, and John M. Malinky. "A complete reconstruction of the hyolithid skeleton." Journal of Paleontology 88, no. 1 (2014): 160–70. http://dx.doi.org/10.1666/13-038.

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Hyolithids are a group of Paleozoic lophotrochozoans with a four-pieced skeleton consisting of a conch, an operculum, and a pair of lateral ‘spines' named helens. Both the conch and operculum are relatively well known and, to a certain extent, have modern analogues in other lophotrochozoan groups. The helens, on the other hand, are less well known and do not have clear modern analogues. This has hindered the knowledge of the complete morphology of the hyolithid skeleton, as well as other aspects of hyolithid biology, such as the organization of soft parts, and their ability to move. The materi

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Jalilzadeh, Afsaneh, Seyed Hamdi, Younes Asri, Mostafa Assadi, and Alireza Iranbakhsh. "Palynological analysis some species of Chenopodiaceae and its systematic implications using scanning electron microscopy." Genetika 54, no. 2 (2022): 539–52. http://dx.doi.org/10.2298/gensr2202539j.

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Chenopodiaceae is a large, diverse and cosmopolitan family within the order Carophyllales. The majority of Chenopodiaceae species are adapted to saline, hypersaline, xerophytic and xerohalophytic communities or ruderal habitats. The family Chenopodiaceae is stenopolinous the pollen grains are monad and exclusively polypantoporate with tiny spinules on both tectum and operculum. Pollen morphology of six genera of Chenopodiaceae (Seidlitzia, Atriplex, Bassia, Salsola, Krascheninnikovia and Spinacia) have been studied in details. These plant species were collected from different phytogeographical

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36

Klongklaew, Kanyaporn, Supattra Poeaim, and Pongrat Dumrongrojwattana. "Four new species of Georissa W. Blanford, 1864 (Gastropoda, Hydrocenidae) from Thailand." Zoosystematics and Evolution 100, no. 4 (2024): 1347–60. http://dx.doi.org/10.3897/zse.100.128717.

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Hydrocenid snails have received little research attention compared to other land snail groups, arguably due to their small size. The present study examines the diversity of hydrocenid snails in limestone hills in central, eastern and southern Thailand. Four new species of Georissa W. Blanford, 1864 are described: G. quinqueliratasp. nov. from central Thailand, G. sagittasp. nov. and G. kohsichangensissp. nov. from eastern Thailand, and G. digitinotasp. nov. from southern Thailand. These four new species are distinguished by unique characteristics in their shell, including protoconch sculpture

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Zhang, Le-Jia, Li-Na Du, and Rintelen Thomas von. "A new genus of river snails, Dalipaludina (Gastropoda, Viviparidae), endemic to the Yunnan Plateau of SW China." Zoosystematics and Evolution 99, no. (2) (2023): 285–97. https://doi.org/10.3897/zse.99.102586.

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A new genus of viviparid snail, Dalipaludina gen. nov., from the Yunnan Plateau of China is described within an integrative taxonomic framework based on data from the mitochondrial COI marker and morphology. Dalipaludina can be distinguished from all other viviparid genera by a unique combination shell, operculum and radula characters. Four species are assigned here to the new genus, Dalipaludina delavayana comb. nov., Dalipaludina oxytropoides comb. nov., Dalipaludina occidentalis comb. nov., and Dalipaludina pyramidella comb. nov., and one species is newly assigned to Margarya, Margarya dian

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38

Xiao, Ming-Yuan, Jia-Jia Wang, Tao Luo, Jia-Jun Zhou, Ning Xiao, and Jiang Zhou. "Sinocyclocheilus xingrenensis (Cypriniformes, Cyprinidae), a new underground fish from Guizhou Province, Southeastern China." Zoosystematics and Evolution 101, no. (2) (2025): 419–36. https://doi.org/10.3897/zse.101.141444.

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This study describes a new species, <i>Sinocyclocheilus xingrenensis</i> sp. nov., collected from a cave near Xingren City, Guizhou Province, China. Morphologically, the new species can be distinguished from the 80 species currently assigned to the genus <i>Sinocyclocheilus</i> by a combination of the following characteristics: absence of horn-like structures and indistinct elevation at the head-dorsal junction; body scaleless, with irregular black markings scattered above the lateral line; tip of pectoral fin not reaching the pelvic fin origin; tip of pelvic fin not reaching the anus; lateral

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Kim, Jeongho, Michael Ubagan, Soyeon Kwon, Il-Hoi Kim, and Sook Shin. "Variation in genetics, morphology, and recruitment of the invasive barnacle Amphibalanus eburneus (Gould, 1841) in the southern Korean peninsula." PeerJ 10 (September 2, 2022): e14002. http://dx.doi.org/10.7717/peerj.14002.

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The ivory barnacle Amphibalanus eburneus is a marine crustacean, which presents near-cosmopolitan distribution due to extensive introduction and exhibits a wide spectrum of phenotypic variation. To elucidate geographical differentiation among populations through invasion, we investigated variation in genetic structure, shell morphology, and recruitment pattern for A. eburneus, from the southern Korean Peninsula where it has been established since the late 1980s. We selected samples from four populations in corresponding ecologically-relevant regions representing all surrounding South Korean wa

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Klimko, Małgorzata, Krystyna Idzikowska, Mariola Truchan, and Anna Kreft. "Pollen morphology of Plantago species native to Poland and their taxonomic implications." Acta Societatis Botanicorum Poloniae 73, no. 4 (2011): 315–25. http://dx.doi.org/10.5586/asbp.2004.041.

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Pollen grains of 9 species of the genus <em>Plantago</em> (Plantaginaceae), including 8 taxa native to Poland, were observed under a light microscope and a scanning electron microscope. Descriptions of grain sculpture are illustrated only SEM micrographs. The studied pollen grains were medium-sized or small, spherical or prolate spheroidal. Their sculpture was always verrucate with granulation. In the studied taxa, internal apertures had the form of pores. Their number ranged from (4)5-9(14). The pores were scattered on the surface of pollen grains. Identification features of indiv

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Manning, J. C., and P. Goldblatt. "Taxonomic revision of the genus Thereianthus (Iridaceae: Crocoideae)." Bothalia 41, no. 2 (2011): 239–67. http://dx.doi.org/10.4102/abc.v41i2.56.

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Thereianthus G.J.Lewis is revised, with full descriptions and synonomy, distribution maps, and notes on ecology and taxonomic history. All species are illustrated, and capsule and seed morphology are described for many of the species for the first time. Novel characteristics of the bract, seed, and pollen operculum are used to separate the species into two sections: sect. Brevibracteae Goldblatt J.C.Manning is distinguished by relatively small bracts, 3–8 mm long and uniformly leathery or soft-textured without thickened veins, seeds with filiform chalazal extension, and pollen grains with 1-ba

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Srisawangwong, T., S. Pinlaor, P. Kanla, and P. Sithithaworn. "Centrocestus formosanus: surface morphology of metacercaria, adult and egg." Journal of Helminthology 71, no. 4 (1997): 345–50. http://dx.doi.org/10.1017/s0022149x00016175.

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AbstractThe surface morphology of metacercariae isolated from Puntius spp., adult worms from infected hamsters and eggs of Centrocestus formosanus (Digenea: Heterophyidae) were studied using scanning electron microscopy. It was found that the surfaces of the metacercariae and adult worms were closely similar in appearance. The oral sucker was surrounded by a circumoral expansion with two rows of 32 spines (16 spines each). The ventral sucker, with six large nonciliated papillae on the lip, and the genital opening were located midventrally. The excretory pore was terminal. The body surface was

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43

Yildiz, Ümmügülsün. "Pollen morphology of twenty three species of Allium L. (Amaryllidaceae) species from Turkey." Bangladesh Journal of Plant Taxonomy 30, no. 1 (2023): 1–19. http://dx.doi.org/10.3329/bjpt.v30i1.67023.

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The pollen morphology of 23 Allium L. species, grown in Turkey, belonging to the sections; Rhizirideum, Schoenoprasum, Cepa, Molium, Brevispatha, Scorodon, Acanthoprason and Melanocrommyum, were investigated by LM (light microscopy), TEM (transmission electron microscope), and SEM (scanning electron microscopy). This paper presents detailed pollen morphological features are given for these taxa. Common characteristics of pollen of Allium species investigated are ellipsoidal and heteropolar, bilateral symmetry; pollen grains are shed as monads. They are monosulcate (extended sulcate types) and

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44

Klongklaew, Kanyaporn, Supattra Poeaim, and Pongrat Dumrongrojwattana. "Four new species of Georissa W. Blanford, 1864 (Gastropoda, Hydrocenidae) from Thailand." Zoosystematics and Evolution 100, no. (4) (2024): 1347–60. https://doi.org/10.3897/zse.100.128717.

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Hydrocenid snails have received little research attention compared to other land snail groups, arguably due to their small size. The present study examines the diversity of hydrocenid snails in limestone hills in central, eastern and southern Thailand. Four new species of <i>Georissa</i> W. Blanford, 1864 are described: <i>G. quinquelirata</i> sp. nov. from central Thailand, <i>G. sagitta</i> sp. nov. and <i>G. kohsichangensis</i> sp. nov. from eastern Thailand, and <i>G. digitinota</i> sp. nov. from southern Thailand. These four new species are distinguished by unique characteristics in their

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Hebda, R. J., C. C. Chinnappa, and B. M. Smith. "Pollen morphology of the Rosaceae of western Canada. II. Dryas, Fragaria, Holodiscus." Canadian Journal of Botany 66, no. 4 (1988): 595–612. http://dx.doi.org/10.1139/b88-086.

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Morphology and geographic variation of pollen grains of three genera of the Rosaceae (Dryas, Fragaria, Holodiscus) of western Canada were studied using the light microscope and scanning electron microscope. Dryas spp. pollen is tricolporate with a weakly developed fusiform aperture in the colpus, which upon expansion of the grain becomes a large rectangular opening. Sculpturing consists of ridges and valleys (striate or rugulate), the latter containing perforations, which grades to a network of ridges and perforations (reticulate) at colpus margins. Ridges are parallel to the colpus or form lo

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Salawati, Vellysa Friendly, Desy Maria Helena Mantiri, Farnis Bineada Boneka, Noldy Gustaf Frans Mamangkey, Veibe Warouw, and Ockstan Kalesaran. "Morphological Characteristics and Shell Color Of Littoraria pallescens Prosobrancia Molusca From Different Mangrove In Tongkaina Waters, Manado City." Jurnal Ilmiah PLATAX 10, no. 1 (2022): 92. http://dx.doi.org/10.35800/jip.v10i1.38559.

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The purpose of this study was to identify sea slugs L. pallescens taken from two different mangroves, namely Rhizophora mucronata and Avicennia marina in Tongkaina waters, Bunaken District, Manado City based on morphology and anatomy as well as shell color. Identification of mangroves and sea slugs refers to the identification book. The results obtained were L. pallescens species with elongated and tapered morphology at the end of the shell measuring 0.3-2.7 cm. The operculum is purple. The color of the shell obtained was 66.85% consisting of dark colors (black, black, orange, brown and gray s

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Sukparangsi, Woranop, Ashitapol Pochai, Chinnakit Wongkunanusorn, and Salinee Khachonpisitsak. "Discovery of Neonrosella vitiata (Darwin) and Newmanella spinosus Chan & Cheang (Balanomorpha, Tetraclitidae) from the Andaman Sea, eastern Indian Ocean." ZooKeys 833 (March 25, 2019): 1–20. http://dx.doi.org/10.3897/zookeys.833.30689.

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In this present study, distantly related acorn barnacle species in the subfamily Newmanellinae (Cirripedia, Thoracica, Tetraclitidae), including Neonrosellavitiata (Darwin, 1854) and Newmanellaspinosus Chan &amp; Cheang, 2016, were discovered in the Andaman Sea of Thailand. Neo.vitiata can be readily distinguished from other newmanellids by shell plate and operculum morphology (external shell, tergum geometry, and pattern of parietal tube) and arthropodal characters (presence of basi-dorsal point at base of penis and triangular spines on cirri, setal type, and mouth parts). Both species we

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48

Kupriyanova, E. K., R. Bastida-Zavala, M. N. Halt, M. S. Y. Lee, and G. W. Rouse. "Phylogeny of the Serpula - Crucigera - Hydroides clade (Serpulidae:Annelida) using molecular and morphological data: implications for operculum evolution." Invertebrate Systematics 22, no. 4 (2008): 425. http://dx.doi.org/10.1071/is08011.

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The type genus of Serpulidae, Serpula Linnaeus, 1758, along with closely related genera Crucigera Benedict, 1887 and Hydroides Gunnerus, 1768, accounts for approximately one-third of all described species in the family. Although previous morphological and molecular studies unequivocally indicate that these three genera constitute a monophyletic group, the status of each genus remains unknown. In this study, the relationships among and within the genera Serpula, Crucigera, and Hydroides were investigated using maximum parsimony and Bayesian analyses of nuclear (18S and 28S rDNA) and mitochondri

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MATESCO, VIVIANA C., BRENDA B. R. J. FÜRSTENAU, JORGE L. C. BERNARDES, CRISTIANO F. SCHWERTNER, and JOCÉLIA GRAZIA. "Morphological features of the eggs of Pentatomidae (Hemiptera: Heteroptera)." Zootaxa 1984, no. 1 (2009): 1–30. http://dx.doi.org/10.11646/zootaxa.1984.1.1.

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Eggs of 14 species within two subfamilies (Edessinae and Pentatominae, tribes Carpocorini, Nezarini, Pentatomini, Procleticini, and one unplaced species) of neotropical pentatomids were studied with scanning electron microscopy, and their external morphology was characterized in detail (chorion surface, operculum, and aero-micropylar processes). Eggs of these species have similar characteristics to those already described for other pentatomids. Most of them are barrelshaped, except in Edessa meditabunda (with spherical eggs) and Odmalea basalis (whose eggs have flattened lateral faces). A “T”-

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Tongkerd, Piyoros, Sakboworn Tumpeesuwan, Khamla Inkhavilay, et al. "Systematic revision of the snorkel snail genus Rhiostoma Benson, 1860 (Gastropoda, Caenogastropoda, Cyclophoridae) with descriptions of new species." ZooKeys 1142 (January 24, 2023): 1–144. http://dx.doi.org/10.3897/zookeys.1142.90097.

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The snorkel snail genus Rhiostoma Benson, 1860 is comprised of terrestrial cyclophorid snails with wide-ranging species diversity and radiation in Southeast Asia. The typical characters of the genus are a depressed shell, a detached and descending portion of the last whorl with a distinctive peristomal breathing device attached, and a calcareous cup-shaped operculum. Herein, we have revised the systematics of extant species based on shell morphology combined with COI barcoding. From these thirty recognised species, twelve are described as new to science: R. ? amarapuraensesp. nov., R. anceyisp

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