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Relevant bibliographies by topics / Operculum morphology

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Academic literature on the topic 'Operculum morphology'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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Journal articles on the topic "Operculum morphology"

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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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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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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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Dissertations / Theses on the topic "Operculum morphology"

1

Sipe, Ann M. "Evaluation of Opercular Bones for Aging Eight Species of Chesapeake Bay Fishes." W&M ScholarWorks, 2001. https://scholarworks.wm.edu/etd/1539617781.

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Book chapters on the topic "Operculum morphology"

1

Cicchino, Graciela. "Importance of the genital operculum in the taxonomy of South American Diaptomidae (Copepoda, Calanoida)." In Ecology and Morphology of Copepods. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-017-1347-4_19.

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Gruet, Yves. "Loss of Opercular Paleae in the Polychaete Annelid Sabellaria alveolata (Linné) (Sabellariidae)." In Systematics, Biology and Morphology of World Polychaeta. BRILL, 1991. http://dx.doi.org/10.1163/9789004629745_033.

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