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1,663 results for “shells”
Disruptive selection of shell colour in land snails: a mark–recapture study of Euhadra peliomphala simodae
<p>Many theoretical studies have suggested that disruptive selection plays an important role in phenotypic divergence, but few studies have determined the action of disruptive selection on phenotypic divergence via field studies. This study investigated the effect of disruptive selection on shell colour polymorphism in the Japanese land snail <i>Euhadra peliomphala simodae</i> to determine whether extreme phenotypes of snail shell colour are favored over intermediate phenotypes<i>.</i> We conducted field surveys on an oceanic island with black, yellow, and intermediate-coloured <i>E. p. simodae</i>snails, capturing and marking approximately 1,800 individual snail and monitoring their survival over 18 months. We quantified their shell colours against images and examined the frequency distribution of shell colour variation. The variation exhibited a bimodal distribution with a far lower frequency of intermediate-coloured snails than of black oryellow snails. The population sizes of the three snail groups fluctuated synchronously with the changing seasons. Bayesian estimates showed lower survival rates for the juvenile intermediate-coloured snails than for juvenile black and yellow snails, implying there was disruptive selection associated with shell colour. We suggest this disruptive selection may have resulted in the evolutionary divergence of the snail's shell colour within the lineage having high shell colour variations.</p>
Data from: The early composition and evolution of the turtle shell (Reptilia, Testudinata)
The shell of the oldest true turtle (Testudinata) branch (Proterochersidae) from the Late Triassic (Norian) of Poland and Germany was built in its anterior and posterior part from an osteodermal mosaic which developed several million years after the plastron, neurals, and costal bones. The most detailed description of the shell composition in proterochersids thus far is provided together with a review of the shell composition in other Triassic pantestudinates, the scenario of early evolution of the turtle shell is proposed based on new data, and the possible adaptive meaning of the observed evolutionary changes is discussed. These observations are consistent with the trend of shell simplification previously reported in turtles. Several aspects of proterochersid shell anatomy are intermediate between O. semitestacea and more derived turtles, supporting their stem phylogenetic position. Three additional ossifications were sutured to xiphiplastra and pelvis in Proterochersis spp. and at least in some individuals the nuchal bone was paired. The peripherals, suprapygals, and pygal bone are most likely of osteodermal origin and homologous to the proterochersid shell mosaic.
NMB&H, Palaeolithic snail shell jewelry
"Upper Palaeolithic Small snail shell used as an ornament. From the site of Badanj in Borojevići near Stolac (Herzegovina) - settlement. 20,000-10,000 BP. Artifact in the National Museum of Bosnia and Herzegovina. Processed in Reality Capture from 366 images. GDH ID No. 7389 This project is a collaboration between Global Digital Heritage and the National Museum of Bosnia and Herzegovina in Sarajevo." Source: Objaverse 1.0 / Sketchfab
Shell Gorget (2020a8854) (CT scan)
**Shell gorget** Location: Coweeta Creek site (31Ma34), Macon County, North Carolina. Period: Mississippian, Qualla phase (AD 1400-1700). Material: marine shell. Dimensions: length, 163.0 mm; width, 131.0 mm; thickness, 32.0 mm. Notes: Catalog no. 2020a8854. This artifact model was created by Abigail Gancz and is derived from a computerized tomography (CT) scan of the object performed at UNC Hospitals in 2014. The model's texture is derived from digital photographs of the object taken in 1994 and only approximates the object's actual texture. Source: Objaverse 1.0 / Sketchfab
Shell Beads (1040a3267)
**Shell Beads (n=36)** Location: Town Creek site (31Mg2-3), Montgomery County, North Carolina. Period: Mississippian, Pee Dee phase (AD 1150-1400). Material: marine shell. Dimensions: length, 19.7 cm; width, 17.0 cm (background size). Notes: Catalog no. 1040a3267 (n=36). North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Steve Davis and Sebastian Farris. Source: Objaverse 1.0 / Sketchfab
Shell Pin (2020a8862) (CT scan)
**Shell pin** Location: Coweeta Creek site (31Ma34), Macon County, North Carolina. Period: Mississippian, Qualla phase (AD 1400-1700). Material: marine shell. Dimensions: length, 130.8 mm; width, 26.8 mm; thickness, 20.8 mm. Notes: Catalog no. 2020a8762, specimen 1. This artifact model was created by Abigail Gancz and is derived from a computerized tomography (CT) scan of the object performed at UNC Hospitals in 2014. The model's texture is derived from digital photographs of the object taken in 1994 and only approximates the object's actual texture. Source: Objaverse 1.0 / Sketchfab
Shell Pin (2158a23-1)
**Shell pin** Location: Peachtree site (31Ce1), Cherokee County, North Carolina. Period: Mississippian (AD 1400-1600). Material: marine shell. Dimensions: length, 60.1 mm; diameter, 20.2 mm. Notes: Catalog no. 2158a23 (specimen 1), North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Chris LaMack. Source: Objaverse 1.0 / Sketchfab
Columella Shell Beads (71a907)
**Columella Shell Beads (n=20)** Location: Town Creek site (31Mg2-3), Montgomery County, North Carolina. Period: Mississippian, Pee Dee phase (AD 1150-1350). Material: marine shell. Dimensions: length, 14.3 cm; width, 13.6 cm (background size). Notes: Catalog no. 71a907 (n=20). North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Sebastian Farris and Elizabeth McGuire. Source: Objaverse 1.0 / Sketchfab
Shell carved in amber
Shell carved in amber. 1st century CE. Tumulus of Cortil-Noirmont (province of Walloon Brabant, Belgium). Musée du Cinquantenaire (Brussels, Belgium). Made with CapturingReality. This object refers to beliefs, superstitions and the hope of salvation of the soul. A jewel fashioned in materials to which the ancients attributed magical and beneficial virtues. The deceased of Cortil-Noirmont had brought small objects, jewels and an amber shell to the tomb. The amber shell is decorated with a winged capricorn carrying the funeral urn between his hooves. The rite of depositing these objects in the tombs was introduced in Gaul by the Romans. For more updates, please consider to follow me on Twitter at @GeoffreyMarchal. Source: Objaverse 1.0 / Sketchfab
Shell Gorget (1965rp2)
**Shell gorget (replica)** Location: Nelson Mound (31Cw1), Caldwell County, North Carolina. Period: Late Precontact (AD 1400-1600). Material: marine shell. Dimensions: length, 107.5 mm; width, 85.8 mm; thickness, 4.8 mm. Notes: Catalog no. 1965rp2. Original artifact (catalog # 82854) is in the US National Museum of Natural History, Washington. Modeled replica is from the North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Abigail Gancz. Source: Objaverse 1.0 / Sketchfab
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
Willy the shell
Toon Char Source: Objaverse 1.0 / Sketchfab
Parametric Resonance in Spherical Immersed Elastic Shells - Supplementary Material
<p>Supplementary material for "Parametric Resonance in Spherical Immersed Elastic Shells" published in SIAM Journal on Applied Mathematics. </p> <p>We provide data files for a benchmark fluid-structure interaction problem of a spherical elastic shell immersed in a viscous incompressible fluid.</p>
FIGURES 35 in Redescription, shell variability and geographic distribution of Plagiodontes dentatus (Wood, 1828) (Gastropoda: Orthalicidae: Odontostominae) from Uruguay and Argentina
FIGURES 35. Representative shells of the three species of Plagiodontes under comparison. 3, Plagiodontes dentatus (Wood, 1828); 4, P. multiplicatus (Doering, 1874); 5, P. patagonicus (d'Orbigny, 1835).
FIGURES 813 in Redescription, shell variability and geographic distribution of Plagiodontes dentatus (Wood, 1828) (Gastropoda: Orthalicidae: Odontostominae) from Uruguay and Argentina
FIGURES 813. SEM photographs of the protoconch sculpture in Plagiodontes spp. 8, P. dentatus; 9, newly hatched P. patagonicus; 10, P. multiplicatus; 11, closeup of Fig. 9, showing the maximum development of the spiral lines crossing the axial striae; 12, eroded apex of P. multiplicatus; 13, closeup of figure 12, showing the remains of spiral sculpture in the protoconch. Bar "a" scales Figures 8, 9, 10, and 12; bar "b" scales Figures 11 and 13.
FIGURE 3. Radulae and shells from Harpeth River pleurocerids. A. Li in A new species of " Lithasia " (Mollusca: Caenogastropoda: Pleuroceridae) from the Harpeth River, Tennessee, U. S. A.
FIGURE 3. Radulae and shells from Harpeth River pleurocerids. A. Li. armigera laterals from The Narrows of the Harpeth State Park. B. Laterals from "Li." spicula, holotype NCSM 26807. Scale bars, 50 m. C. "Li." spicula, holotype NCSM 26807, 31 mm.
FIGURES 67 in Redescription, shell variability and geographic distribution of Plagiodontes dentatus (Wood, 1828) (Gastropoda: Orthalicidae: Odontostominae) from Uruguay and Argentina
FIGURES 67. SEM photographs of the teleoconch sculpture near the aperture lip. 6, Plagiodontes dentatus; 7, P. multiplicatus.
FIGURES 1416 in Redescription, shell variability and geographic distribution of Plagiodontes dentatus (Wood, 1828) (Gastropoda: Orthalicidae: Odontostominae) from Uruguay and Argentina
FIGURES 1416. SEM photographs of the apertural teeth in Plagiodontes spp. 14, P. dentatus; 15, P. multiplicatus (arrow indicates the presence of a denticle on the columellar tooth); 16, P. patagonicus.
FIGURE 12 in Morphology and biology of Polydora species (Polychaeta: Spionidae) boring into oyster shells in South America, with the description of a new species
FIGURE 12. Polydora carinhosa sp. nov. larval morphology, Paraná. A, anterior fragment of early 14-chaetiger larva from egg capsule, dorsal view, showing short caruncle with one pair of large glandular cells, and rounded nuchal ciliary patches on the posterior dorso-lateral sides of the prostomium. B–C, late 14-chaetiger larva from egg capsule, showing pigmentation pattern. B, dorsal view, showing arrangement of melanophores. C, ventral view, showing distribution of yellow pigment.
FIGURE 11 in Morphology and biology of Polydora species (Polychaeta: Spionidae) boring into oyster shells in South America, with the description of a new species
FIGURE 11. Polydora carinhosa sp. nov. larval morphology, Paraná. A, 10-chaetiger larva from egg capsule, left lateral view, showing pattern of black pigmentation. B–H, set of chaetae of 14- chaetiger 5 larva: B, C, capillary chaeta and bidentate hooded hook from neuropodium of chaetiger 7. D–H, modified chaetae of chaetiger 5; right side chaetae in ventral view: D, ventral capillary chaeta. E, dorsal superior capillary chaeta. F, provisional awl-like spine with sigmoid distal end. G, provisional heavy falcate spine with longitudinal groove. H, "quasi-adult" heavy falcate spine and bilimbate-tipped companion chaeta.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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