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87 results for “gastropod shell”
FIG. 4 in Shell shape variation of the symbiotic gastropod Phenacovolva rosea (Ovulidae) in Vietnam
FIG. 4. ANOVA tests of width-to-height ratio of P. rosea shells across different host species, vertical bars denote 0,95 confidence intervals. A. In three northern locations (current effect: F(2, 23)=,09015, p=,91411). B. In Nha Trang (F(2, 12)=1,4096, p=,281).
FIG. 1 in Shell shape variation of the symbiotic gastropod Phenacovolva rosea (Ovulidae) in Vietnam
FIG. 1. Map of studied locations. A. Outline of Vietnam highlighting the two studied regions marked with black boxes. B. Detailed map showing the three northern locations: Cat Ba Island, Quan Lan Island, and Co To. C. Map depicting Nha Trang Bay and its islands.
РИС. 2. ИЗменчивость формы раковины P. rosea. Слева. ВиЗуалиЗация иЗменчивости формы раковины для каЖдой глав- ной компоненты по отдельности, выполнена в программе PrinPrint пакета SHAPE. Справа. Контрастные варианты формы раковины. Все шесть раковин приведены в стандартной поЗиции устьем вверх, для двух иЗ них приведены фото с дорЗальной стороны, как пример иЗобраЖений испольЗованных в аналиЗе силуЭтов. A. Локация – Ня Чанг, хоЗяин – Echinogorgia sp. 2. B. Ко То, Astrogorgia sp. 2. C. Куан Лан, Astrogorgia sp. 3. D. Ня Чанг, Menella sp. E. Ня Чанг, Bebryce sp. F. Ня Чанг, Paraplexaura sp. in Shell shape variation of the symbiotic gastropod Phenacovolva rosea (Ovulidae) in Vietnam
РИС. 2. ИЗменчивость формы раковины P. rosea. Слева. ВиЗуалиЗация иЗменчивости формы раковины для каЖдой глав- ной компоненты по отдельности, выполнена в программе PrinPrint пакета SHAPE. Справа. Контрастные варианты формы раковины. Все шесть раковин приведены в стандартной поЗиции устьем вверх, для двух иЗ них приведены фото с дорЗальной стороны, как пример иЗобраЖений испольЗованных в аналиЗе силуЭтов. A. Локация – Ня Чанг, хоЗяин – Echinogorgia sp. 2. B. Ко То, Astrogorgia sp. 2. C. Куан Лан, Astrogorgia sp. 3. D. Ня Чанг, Menella sp. E. Ня Чанг, Bebryce sp. F. Ня Чанг, Paraplexaura sp.
Fig. 2 in Repaired injuries and shell form in some Palaeozoic pleurotomarioid gastropods
Fig. 2. Schematic drawing of Fig. 1 as a guide to emphasize the location of repaired injuries, here shown in thicker lines. For explanation see Fig. 1 captions and the text. A–F. Turbiniform shells. G–J. Trochiform shells. K, L. Planispiral shells.
Figure 6 in Adulthood and phylogenetic analysis in gastropods: character recognition and coding in shells of Lavigeria (Cerithioidea, Thiaridae) from Lake Tanganyika
Figure 6. Plots of length against PC1 for all eight species of Lavigeria studied with regressed lines and R2 values. Length values are log transformed.
Figure 3 in Adulthood and phylogenetic analysis in gastropods: character recognition and coding in shells of Lavigeria (Cerithioidea, Thiaridae) from Lake Tanganyika
Figure 3. Character state APPL. An adult specimen of L. n. sp. X (left) and a juvenile (right). Notice the perimetric, wrinkle-like, lines on the front surface of the apertural lip of the adult. Scale bar = 0.2 cm.
Figure 7 in Adulthood and phylogenetic analysis in gastropods: character recognition and coding in shells of Lavigeria (Cerithioidea, Thiaridae) from Lake Tanganyika
Figure 7. Fifty per cent majority-rule consensus trees of five, nine, ten and 31 trees (from top to bottom, respectively) from four matrices. Matrices are coding the data of Table 1. See Analysis for explanation of the matrices. Tree and character statistics are given in Table 3. Optimality criterion: maximum parsimony, exhaustive search. All characters binary, of equal weight and unordered. Numbers indicate percentage of topologies that include the respective branches.
Figure 5 in Adulthood and phylogenetic analysis in gastropods: character recognition and coding in shells of Lavigeria (Cerithioidea, Thiaridae) from Lake Tanganyika
Figure 5. Character states DFST, AXRB and UEPW. Adult specimens of (A) L. n. sp. W, (B) L. n. sp. F, (C) L. n. sp. K, (D) L. n. sp. J showing the aperture in side view and (E) an apertural view of an adult L. n. sp. W. In A-D the trajectory of the suture tends to deviate downwards in comparison to the trajectory of the spiral cord of the previous whorl immediately above the suture (DFST). A and D also show the loss of, or irregularities in the appearance of axial sculpture (AXRB). In E, arrowheads show the undulations formed at the edge of the parietal side of the aperture (UEPW). Scale bar = 0.2 cm.
Figure 2 in Adulthood and phylogenetic analysis in gastropods: character recognition and coding in shells of Lavigeria (Cerithioidea, Thiaridae) from Lake Tanganyika
Figure 2. Character states WGPW and APLT. An adult specimen of L. n. sp. A (left) and a juvenile (right). The adult shows a thickened (APLT) and opaque (WGPW) inner surface of the apertural lip in comparison to the juvenile. Scale bar = 0.2 cm.
Figure 1 in Adulthood and phylogenetic analysis in gastropods: character recognition and coding in shells of Lavigeria (Cerithioidea, Thiaridae) from Lake Tanganyika
Figure 1. Eight species used in this study, apertural and side views of adult specimens. (A) Lavigeria new species N. (B) L. n. sp. F. (C) L. n. sp. J. (D) L. n. sp. X. (E) L. n. sp. K. (F) L. n. sp. W. (G) L. n. sp. A. (H) L. n. sp. U. C-H all belong to the same clade. A and B belong to different clades within the genus. Scale bar = 0.2 cm.
Figure 4 in Adulthood and phylogenetic analysis in gastropods: character recognition and coding in shells of Lavigeria (Cerithioidea, Thiaridae) from Lake Tanganyika
Figure 4. Character state APDT. An adult specimen of L. n. sp. J (left) and a juvenile on the right. Notice in the adult how the parietal side of the apertural lip is completely detached from the previous whorl and a false umbilicus has developed. Scale bar = 0.2 cm.
Text-fig. 4. Taphonomic features of the studied localities of ammonoids. a: Sandstone slab with fragmentary remains of productid and spiriferid brachiopods, orthocerids, coiled nautiloids and ammonoids (stratigraphic level No. 3). b: Shell debris cluster and fragment of crushed ammonoid conch (stratigraphic level No. 1). c: Epibionts on the surface of an ammonoid conch (stratigraphic level No. 5). d: Cluster of bivalves, gastropods and cephalopods remains in a siderite nodule (stratigraphic level No. 5). e: Fragment of an ammonoid conch (stratigraphic level No. 3). f: Fragment of an ammonoid conch (?) with terminal aperture and brachiopod valve (stratigraphic level No. 3). g: Specimen of?Anthracoceratites sp. with conch injuries (shown by arrows) (stratigraphic level No. 8). h, i: Bioerosion trace fossils Cyclopuncta girtyi ELIAS, 1958 on the fragments of cephalopod conchs (stratigraphic level No. 5). j: Limonitized conchs of the ammonoid (stratigraphic level No. 7). k: Fragment of an ammonoid conch (stratigraphic level No. 5). Scale bars 10 mm. in Late Bashkirian Ammonoids From The Mospyne Formation Of The Donets Basin, Ukraine
Text-fig. 4. Taphonomic features of the studied localities of ammonoids. a: Sandstone slab with fragmentary remains of productid and spiriferid brachiopods, orthocerids, coiled nautiloids and ammonoids (stratigraphic level No. 3). b: Shell debris cluster and fragment of crushed ammonoid conch (stratigraphic level No. 1). c: Epibionts on the surface of an ammonoid conch (stratigraphic level No. 5). d: Cluster of bivalves, gastropods and cephalopods remains in a siderite nodule (stratigraphic level No. 5). e: Fragment of an ammonoid conch (stratigraphic level No. 3). f: Fragment of an ammonoid conch (?) with terminal aperture and brachiopod valve (stratigraphic level No. 3). g: Specimen of?Anthracoceratites sp. with conch injuries (shown by arrows) (stratigraphic level No. 8). h, i: Bioerosion trace fossils Cyclopuncta girtyi ELIAS, 1958 on the fragments of cephalopod conchs (stratigraphic level No. 5). j: Limonitized conchs of the ammonoid (stratigraphic level No. 7). k: Fragment of an ammonoid conch (stratigraphic level No. 5). Scale bars 10 mm.
On the use of antibiotics in plasticity research: gastropod shells unveil a tale of caution
<p>1) Through phenotypic plasticity, individual genotypes can produce multiple phenotypes dependent on the environment. In the modern world, anthropogenic influences such as man-made pharmaceuticals are increasingly prevalent. They might alter observable patterns of plasticity and distort our conclusions regarding the adaptive potential of natural populations.</p> <p>2) Antibiotics are nowadays nearly ubiquitous in aquatic environments and prophylactic antibiotic use is also becoming more common to optimize animal survival and reproductive output in artificial settings. In the well-studied plasticity model system <em>Physella acuta</em>, prophylactic erythromycin treatment acts against gram-positive bacteria and thereby reduces mortality.</p> <p>3) Here, we study its consequences for inducible defence formation in the same species. In a 2×2 split-clutch design, we reared 635 <em>P. acuta</em> in either the presence or absence of this antibiotic, followed by 28-day exposure to either high or low predation risk as perceived through conspecific alarm cues.</p> <p>4) Under antibiotic treatment, risk-induced increases in shell thickness, a well-known plastic response in this model system, were larger and consistently detectable. Antibiotic treatment reduced shell thickness in low-risk individuals, suggesting that in controls, undiscovered pathogen infection increased shell thickness under low risk. Family variation in risk-induced plasticity was low, but the large variation in responses to antibiotics among families suggests different pathogen susceptibility between genotypes. Lastly, individuals that developed thicker shells had reduced total mass, which highlights resource trade-offs.</p> <p>5) Antibiotics thus have the potential to uncover a larger extent of plasticity, but might counterintuitively distort plasticity estimates for natural populations where pathogens are a part of natural ecology.</p>
Figure 46. Shell ofBythiospeum demattiai n in New subterranean freshwater gastropods of Montenegro (Mollusca: Gastropoda: Hydrobiidae), with description of one new genus and two new species
Figure 46. Shell ofBythiospeum demattiai n. sp. 4 = holotype, 5 = paratype, 6 = aperture from the lateral view.
On the use of antibiotics in plasticity research: gastropod shells unveil a tale of caution
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Fig. 1 in Untangling species identity in gastropods with polymorphic shells in the genus Bolma Risso, 1826 (Mollusca, Vetigastropoda)
Fig. 1. Map showing sampling localities. See Supplementary file for details.
Fig. 5 in A New Cleaning Method for Accurate Examination of Freshwater Gastropod Shell Specimens Covered with Iron-rich Deposits
Fig. 5. Aperture-closing method using kneaded eraser.
Predation by shell-breaking crabs on a marine gastropod along a latitudinal gradient in the SW Atlantic: Influence of extrinsic and intrinsic factors
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BIRUG 19266 - Helmet Shell Gastropod
BIRUG19266 was not given a species name when it was donated, however it best resembles the bonnet- or helmet-shelled snail and genus *Cypraecassis* from the family Cassidae. The coloration of this group of bonnet shells is characteristic in that they are banded and have white and brown or orange stripes on the body whirl of the shell, while the outer lip has thicker bands of color. These sea snails are predacious and hunt mobile prey, normally sea urchins and are found searching for prey along the sea floor. This specimen was collected from Llandudno by Sowerby in 1879 and given to the Museum in 1916 by Sir George H. Holcroft. Scanning was performed by Sian Miller using an Artec Spider 3D scanner. Description by Jonathan Kimel. Source: Objaverse 1.0 / Sketchfab
Figure 1 in The balanced life: evolution of ventral shell weighting in gastropods
Figure 1. Examples of Recent gastropods with a ventral callus. All specimens are in the Vermeij collection. A, Monetarla caputserpentis Linnaeus, 1758 (Cypraeidae), reef off Nchesar, Babeldaob, Palau, collected 5 September 1975; cypraeiform callus. B, Cypraecassis testiculus Linnaeus, 1758 (Cassidae), grassbeds, Isla Galeta, Atlantic Panama, collected 12 April 1975; cassiform callus. C, Vasum rhinoceros Gmelin, 1791 (Vasidae), in grassbeds, Klkambala, Kenya, collected June 1972; modified cassiform callus. D, Gutturnium muriclnum Roding, 1798 (Cymatlidae), at depth of 4 m lying on its dorsal side, northeast coast of Urukthape1, Palau, collected 19 June 1984 by Roy K. Kropp; modified cassiform callus. E, Polinices mammilla Linnaeus, 1758 (Naticidae), Cocotiers beach, Nosy-Be, Madagascar, collected 29 June 1972; pseudoliviform callus. F, Phrontis luteostoma Broderip & Sowerby, 1829 (Nassariidae), Playa Venado, Pacific Panama, collected 28 August 1969; cassiform callus. G, Ministrombus variabilis Swainson, 1820 (Strombldae), depth of 12 m, Malakal, Palau, collected 9 July 1984 by Roy K. Kropp; modified cassiform callus. H, Nassarius pullus Linnaeus, 1758 (Nassariidae), grassbed, Taneti Island, Maluku, Indonesia, collected 12 July 1979; cassiform callus. I, Linnerita polita Linnaeus, 1758 (Neritidae), Tagachan Point, Guam, collected 26 May 1981; modified cassiform callus. Scale bar: 1 cm.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.