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78 results for “Bivalve shell”
Fig. 6 in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development
Fig. 6. Stages of shell metamorphosis in Berthelinia singaporensis. A, initial growth of visor-shaped shell (arrowhead); B–C, pedi-veligers on Caulerpa with increasing visor; in C veliger shell is tilted; D, first appearance of fold in visor (arrow) looking like notch.
Fig. 9 in A fold in the visor: formation of the bivalved shell in Berthelinia singaporensis Jensen, 2015 (Gastropoda: Heterobranchia: Sacoglossa), with notes on spawning and development
Fig. 9. Juvenile development of Berthelinia singaporensis (continued). A, two specimens on Caulerpa; smaller white one with many brown pigment spots, larger specimen completely green with some brown spots; B, close-up of protoconch area of larger specimen showing green contents of digestive gland extending into protoconch.
Figure 3. Shell ontogeny. A in Phylogeny of cardiid bivalves (cockles and giant clams): revision of the Cardiinae and the importance of fossils in explaining disjunct biogeographical distributions
Figure 3. Shell ontogeny. A, Chesacardium laqueatum (FMNH UC7082), B, Chesacardium laqueatum (FMNH PE3523). C, D, Planicardium virginianum (UNC 11856). All scale bars = 10 mm.
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.
Data for "Sr/Ca in shells of laboratory-grown bivalves (Arctica islandica) serves as a proxy for water temperature – Perspectives for (paleo)environmental research?"
<p>This repository contains all data generated for the publication "Sr/Ca in shells of laboratory-grown bivalves (<em>Arctica islandica</em>) serves as a proxy for water temperature – Perspectives for (paleo)environmental research?" currently under review.</p>
Data from: Bivalve shells reflect 15N enrichment in a fertilizer-dominated estuary
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Spatiotemporal changes in riverine input into the Eocene North Sea revealed by strontium isotope and barium analysis of bivalve shells
<p>Extended data and calculations belonging to this study are summarized in the supplementary material. These supplements contain the following supplementary data files: </p> <ul> <li>Supplementary material: supplementary Figure S1</li> <li>Supplementary data 1: Element and isotope data for each individual shell</li> <li>Supplementary data 2: <sup>87</sup>Sr/<sup>86</sup>Sr salinity variability reconstruction</li> <li>Supplementary data 3: Stratigraphy for sampling locations</li> <li>Supplementary data 4: <sup>87</sup>Sr/<sup>86</sup>Sr data for recent oyster shells</li> <li>Supplementary data 5: Extended strontium isotope data</li> </ul>
Specimen alignment with limited point-based homology: 3D morphometrics of disparate bivalve shells (Mollusca: Bivalvia)
<p>Supplemental data and code for Edie, Collins, and Jablonski, Specimen alignment with limited point-based homology: 3D morphometrics of disparate bivalve shells (Mollusca: Bivalvia).</p>
Fig. 10 in Ecophenotypic plasticity versus evolutionary trends-morphological variability in Upper Jurassic bivalve shells from Portugal
Fig. 10. Box plot of rib numbers in Arcomytilus. Numbers in squared brackets refer to Fig. 2.
Supplementary Data to: "Organic Phases in Bivalve (Arctica islandica) Shells: Their Bulk and Amino Acid Nitrogen Stable Isotope Compositions" in Geochemistry, Geophysics, Geosystems
<p>This dataset contains the data generated for publication "Organic Phases in Bivalve (<em>Arctica islandica</em>) Shells: Their Bulk and Amino Acid Nitrogen Stable Isotope Compositions", including the following files:</p> <p>Specimen_ID_shell_morphology_measurement: Description of locality of collection, shell ID, shell working ID and the shell morphology measurement which can be referred to Section 2.1 of the manuscript.</p> <p>EA_IRMS_raw_error_propagate: This file contains data showing the m/z 28 signal intensities of all measurements and the error propagation that mentioned in Section 2.3 of the manuscript. It also includes the calculation of analytical accuracy and precision. </p> <p>Statistics: The file contains the summary of statistical analyses performed in this manuscript. Refer to Section 2.7 and 3.3.</p> <p>Recovery: It contains the recovery of the total nitrogen contents or amino acid concentrations after different treatments and this was mentioned in Section 4.1 of the manucript.</p> <p>Mass_balance: The computation procedure that showed in Section 3.4 and discussed in Section 4.3 can be traced in this file.</p> <p>GC-C-IRMS_long_term_sd: The file shows the long-term precision of GC-C-IRMS computed from the mixed standard of amino acids </p> <p>BSIA_d15N: The file contains all the bulk d15N data that used in this manuscript.</p> <p>CSIA_d15N: The file contains all the amino acid d15N data that used in this manuscript.</p> <p>AA_Composition: The file shows AA percent data that used in this manuscript.</p> <p><br> For details see main text of the manuscript.</p> <p><br> </p>
Mineralogy and organic content are major predictors of shell loss in bivalves under reduced salinity, ocean freshening conditions
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Data from: Temporal trends in allometry of shell calcification in northeastern Pacific venerid bivalves: Implications for predicting responses to climate change
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Data from: Shells of the bivalve Astarte moerchi give new evidence of a strong pelagic-benthic coupling shift occurring since the late 1970s in the NOW Polynya
<p>Climate changes in the Arctic may weaken the currently tight pelagic-benthic coupling. In response to decreasing sea ice cover, arctic marine systems are expected to shift from a 'sea-ice algae-benthos' to a 'phytoplankton-zooplankton' dominance. We used mollusk shells as bioarchives and fatty acid trophic markers to estimate the effects of the reduction of sea ice cover on the exported food to the seafloor. Bathyal bivalve <i>Astarte moerchi</i> that lives at 600 m depth in northern Baffin Bay reveals a clear shift in growth variations and Ba/Ca ratios since the late 1970s that we relate to a change in food availability. Fatty acid compositions of tissues show that this species feeds mainly on microalgae exported from the euphotic zone to the seabed. We thus suggest that changes in pelagic-benthic coupling are likely due to either local changes in sea ice dynamics, mediated through bottom-up regulation exerted by sea ice on phytoplankton production or to a mismatch between phytoplankton bloom and zooplankton grazing due to change in their phenology. Both possibilities allow a more regular and increased transfer of food to the seabed.</p>
Data from: Shell ornamentation as a likely exaptation: evidence from predatory drilling on Cenozoic bivalves
Predation is an important process in modern oceans and in the evolutionary history of marine ecosystems. Consequently, it has been hypothesized that shelled prey modified their ornamentation in response to predation. However, bivalve ornamentation has also been argued to be important in maintaining a stable life position in the sediment and in burrowing. To test whether concentric ribs were effective against drilling by carnivorous gastropods, we examined drill hole position and completeness for four Cenozoic bivalve species that differ in rib strength (Astarte radiata, A. goldfussi, Lirophora glyptocyma, and L. latilirata). The percentage of drill holes located between the ribs increases with increasing rib strength, whereas the percentage of drill holes on top of ribs decreases. This result suggests that gastropods select the drill hole site more effectively as rib strength increases, thereby saving time and energy, and that natural selection favors gastropods that select drill hole sites between ribs. Because of this greater stereotypy, the percentage of drill holes that are incomplete is generally lower in strongly ribbed species. The proportion of drill holes located on top of ribs is greater for incomplete than complete holes, implying that ribs can be effective against predators, but only when selected as the drilling location. We show that ribs are most effective against drilling predation for bivalves with moderately sized ribs, between which gastropods have difficulty siting drill holes. Concentric ribs are unlikely to have evolved as an adaptation against drilling predation because concentric ribs evolved in the Paleozoic and were already common in the Mesozoic, whereas drilling frequency increased later, in the Late Cretaceous–Paleogene. Moreover, rib strength of North American Astarte did not change through this time interval. Thus, the ribs considered here are a likely exaptation to drilling given their effectiveness at deterring drilling predation on bivalves with moderate ribs.
FIGURES 25–29. Dilemma frumarkernorum. Shell hinge and ligament. 25–28. Paratype 2. 25 in A remarkable new genus of carnivorous, sessile bivalves (Mollusca: Anomalodesmata: Poromyidae) with descriptions of two new species
FIGURES 25–29. Dilemma frumarkernorum. Shell hinge and ligament. 25–28. Paratype 2. 25. Internal views of shell, SEM. Left valve on left side. 26. Hinge in posteroventral view, SEM. 27. Same view, optical photography. 28. Detail of right valve showing ligament. 29. Paratype 1. Attached valves in ventro-lateral view showing hinge with interlocking teeth and sockets. Scale bars: Figures 25–27, 29 = 2 mm; Figure 28 = 1 mm.
Supporting for "Bivalve Resilience to Ocean Acidification: Active H+ Efflux as a Mechanism for Shell Growth Maintenance"
<p><span>Summary: </span></p> <p><span>This dataset encompasses a comprehensive collection of responses from the Manila clam <em>Ruditapes philippinarum</em> to ocean acidification. Key metrics included in this dataset are oxygen consumption rate, Ammonia-N excretion rate, intracellular pH, H⁺ flux, expression and activity of acid-base regulatory genes, and individual growth measurements.</span></p> <p><span> </span><span>The data was systematically compiled from both field mesocosm and laboratory experiments aimed at elucidating the physiological responses and underlying mechanisms by which bivalves adapt to the stressors associated with ocean acidification.</span></p> <p><span> </span><span>Data generation occurred primarily between 2020 and 2023. This dataset serves as a valuable resource for enhancing our mechanistic understanding of the responses and adaptive potential of marine bivalves in the context of escalating ocean acidification.</span></p>
Figure 7 in Shell formation in two species of bivalves: the role of mantle cells and haemocytes
Figure 7. Transverse section of outer margin of mantle of Cerastoderma glaucum, 20×, 40×; scale bars, 20 μm, 50 μm. There is clear colocalization of epithelial cells that are S100 (green) and 5-HT (red) immunoreactive (arrowheads). In the epithelium and subepithelium, there are noticeable and prominent haemocytes that are 5HT and S100 reactive (arrows). Highly colocalized epithelial cells immunopositive for iNOS and TLR2 can be found (arrowheads). In the epithelium and subepithelium, immunoreactive haemocytes that colocalize for iNOS and TLR2 are clearly visible (arrow). Colocalization is validated by the confocal microscope 'display profile' feature.
Figure 5 in Shell formation in two species of bivalves: the role of mantle cells and haemocytes
Figure 5. Transverse section of outer margin of mantle of Cerastoderma glaucum, 100×. Mallory histologic staining shows the presence of a columnar epithelium (**) that introjects giving rise to pleated epithelia (FE). Muscle components (M) and collagen fibres (C) are visible in the subepithelium. By AB/PAS histochemical staining, acid-secreting mucous cells (arrowheads) are evident. Also well visible are mucous cells with neutral secretion in the epithelium (arrows) and agglomerates of neutral secretion in the subepithelium (double arrows). Large agglomerates of acid mucous in the subepithelium (double arrowheads) also appear well represented. Ciliated epithelial cells (cec) appear notable, scale bar 100 μm.
Figure 3 in Shell formation in two species of bivalves: the role of mantle cells and haemocytes
Figure 3. Graphical elaboration of the outer margin mantle of Polititapes aureus and Cerastoderma glaucum. The stain used is AB/PAS. OF = outer fold; MF = medium fold; IF = inner fold.
Figure 2 in Shell formation in two species of bivalves: the role of mantle cells and haemocytes
Figure 2. Macroscopic evaluation of Cerastoderma glaucum. Yellow-white, sometimes light brown, curved shell with typical heart shape when viewed in profile. Very pronounced ribs. Interior of shell milky white. Shell of medium size with thick ribs and knobby formations at growth striae. Right valve with two main teeth and the two anterior and posterior secondary teeth.
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