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1,663 results for “shells”
Data from: Periodic shell decollation as an ecology-driven strategy in the early Cambrian Cupitheca
<p>Shell decollation is a growth strategy that has been adopted by a number of invertebrate taxa to offset the metabolic and ecological disadvantages of shell growth. However, little is known about the origin and evolution of this process. We here describe well-preserved specimens of the hyolith, <i>Cupitheca decollata</i> sp. nov., preserving the decollation process from the early Cambrian Yu'anshan Formation (ca. 518 million years ago) of South China. Based on a large number of specimens collectively representing different developmental stages, we use high-resolution X-ray microtomography and scanning electronic microscopy to reconstruct the process of decollation in this taxon. <i>Cupitheca</i> is among the earliest known small shelly fossils, and thus our discovery confirmed that periodic decollation had evolved by the onset of the Cambrian explosion, reflecting the high intensity of the predator-prey arms race in early Cambrian ecosystems. A comparison between the decollation processes of <i>Cupitheca</i> and other shelly invertebrates suggests that periodic decollation and the associated molecular mechanisms of calcium dissolution, uptake, allocation, and deposition may have had multiple independent origins.Shell decollation is a growth strategy that has been adopted by a number of invertebrate taxa to offset the metabolic and ecological disadvantages of shell growth. However, little is known about the origin and evolution of this process. We here describe well-preserved specimens of the hyolith, <i>Cupitheca decollata</i> sp. nov., preserving the decollation process from the early Cambrian Yu'anshan Formation (ca. 518 million years ago) of South China. Based on a large number of specimens collectively representing different developmental stages, we use high-resolution X-ray microtomography and scanning electronic microscopy to reconstruct the process of decollation in this taxon. <i>Cupitheca</i> is among the earliest known small shelly fossils, and thus our discovery confirmed that periodic decollation had evolved by the onset of the Cambrian explosion, reflecting the high intensity of the predator-prey arms race in early Cambrian ecosystems. A comparison between the decollation processes of <i>Cupitheca</i> and other shelly invertebrates suggests that periodic decollation and the associated molecular mechanisms of calcium dissolution, uptake, allocation, and deposition may have had multiple independent origins.</p>
Data from: The hatching mechanism of 130-million-year-old insects: an association of neonates, egg shells and egg bursters in Lebanese amber
Hatching is a pivotal moment in the life of most animals. Diverse chemical, behavioural and mechanical methods have evolved in metazoans to break the egg membranes. Among them, many arthropod and vertebrate embryos hatch using ephemeral, frequently convergent structures known as egg bursters. However, the evolutionary processes by which hatching mechanisms and related embryonic structures became established in deep time are poorly understood due to a nearly complete absence from the fossil record. Herein we describe an exceptional c. 130‐million‐year‐old association in Lebanese amber composed of multiple neonate green lacewing larvae, Tragichrysa ovoruptora gen. et sp. nov. (Neuroptera, Chrysopoidea), and conspecific egg remains. Egg bursters with a serrated blade bearing a short process are attached to three longitudinally split egg shells. Embryos of extant green lacewing relatives (Chrysopidae) utilize this egg burster morphotype to open a vertical slit on the egg, after which the burster is moulted and left joined to the empty egg shell. Additionally, the new larval species has extremely elongate dorsal tubercles, an adaptation to carry exogenous debris for protection and camouflage also known from other Cretaceous chrysopoids but absent in modern relatives. The present discovery demonstrates that the hatching mechanism of modern green lacewings was established in the chrysopoid lineage by the Early Cretaceous and proves through direct fossil evidence how some morphological traits related to hatching and linked behaviours, at least in insect embryos, have been subject to a high degree of evolutionary conservatism.
Oval garnet intaglio with a concave back, engraved with a shell, trident and wheel.
<p>Oval garnet intaglio with a concave back, engraved with a shell, trident and wheel. British Museum 1892,1103.134.</p>
Unknown species of fossil shell from New Zealand
Scanned with the Revopoint POP 2. A fossil shell I collected and used as a test scan. Source: Objaverse 1.0 / Sketchfab
Shell Disk (71a832)
**Shell disk** Location: Town Creek site (31Mg2-3), Montgomery County, North Carolina. Period: Mississippian (AD 1150-1400). Material: marine shell. Dimensions: length, 34.3 mm; width, 33.1 mm; thickness, 4.7 mm. Notes: Catalog no. 71a832. North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Abigail Gancz. Source: Objaverse 1.0 / Sketchfab
Grosvenor Gardens Shell Hut East
One of two small shed/huts in the small public park at Grosvenor Gardens, Victoria, London. This one is the one on the east side. Date: 1952 Designed by Jean Moreux. https://en.wikipedia.org/wiki/Grosvenor_Gardens 296 photos taken in November 2020 with a Sony a6000 and processed in Reality Capture. Source: Objaverse 1.0 / Sketchfab
Shell Adze, Orange County, Florida (2)
This adze is a woodworking tool made from the whorl of a queen conch (Strombus gigas) shell imported from the coast. It was recovered from the Shell Island site in Orange County, Florida and likely dates to the Middle-Late Archaic period (ca. 7400-3500 CE). It is curated at the Rollins College Archaeology Lab. Model by Zack Gilmore and Ellie Minette. Source: Objaverse 1.0 / Sketchfab
Shell Gorget (2342a3375)
**Shell gorget** Location: Hairston site (31Sk1), Stokes County, North Carolina. Period: Late Woodland (AD 1500-1600). Material: marine shell. Dimensions: length, 91.8 mm; width, 80.0 mm; thickness, 4.8 mm. Notes: Catalog no. 2342a3375, North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Abigail Gancz. Source: Objaverse 1.0 / Sketchfab
War Barron Shell Box
Shell Box recoved by Dive Newquay from the wreck of the Wart Barron sunk 9nm from Newquay Harbour SS War Baron, built by Northwest Steel Co., Portland, Oregon in 1917 and owned at the time of her loss by The Shipping Controller (Cunard SS. Co. Ltd.), London, was a British steamer of 6.240 tons. On January 5th, 1918, War Baron, on a voyage from Southampton to Barry in ballast, was sunk by the German submarine U-55 (Wilhelm Werner), 8 miles northeast of the Godrevy lighthouse, St Ives. 2 persons were lost. Source: Objaverse 1.0 / Sketchfab
Shell Pin (2157a22-1)
**Columella shell ear pin** Location: Nununyi mound (31Sw3), Swain County, North Carolina. Period: Mississippian, probably Qualla phase (AD 1400-1700). Material: marine shell. Dimensions: length, 100.1 mm; width, 18.0 mm; thickness, 13.8 mm. Notes: Catalog no. 2157a22, specimen 1. North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Abigail Gancz. Source: Objaverse 1.0 / Sketchfab
Shell Pin (2157a22-2)
**Columella shell ear pin** Location: Nununyi mound (31Sw3), Swain County, North Carolina. Period: Mississippian, probably Qualla phase (AD 1400-1700). Material: marine shell. Dimensions: length, 116.7 mm; width, 18.2 mm; thickness, 13.5 mm. Notes: Catalog no. 2157a22, specimen 2. North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Abigail Gancz. Source: Objaverse 1.0 / Sketchfab
Shell Pin (2158a22-1)
**Shell pin** Location: Peachtree site (31Ce1), Cherokee County, North Carolina. Period: Mississippian (AD 1400-1600). Material: marine shell. Dimensions: length, 56.1 mm; width, 45.7 mm; thickness, 35.3 mm. Notes: Catalog no. 2158a22 (specimen 1), North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Abigail Gancz. Source: Objaverse 1.0 / Sketchfab
Shell Dipper Fragment (1948a43)
**Conch shell dipper fragment** Location: Sellers site (31Cy42), Clay County, North Carolina. Period: Mississippian, Qualla phase (AD 1400-1600). Material: marine shell. Dimensions: length, 124.9 mm; width, 67.0 mm; thickness, 8.4 mm. Notes: Catalog no. 1948a43. North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Abigail Gancz. Source: Objaverse 1.0 / Sketchfab
Shell Gorget (2351a535-2)
**Engraved shell gorget** Location: Fredricks site (31Or231), Orange County, North Carolina. Period: Historic (AD 1700). Material: marine shell. Dimensions: length, 40.5 mm; width, 40.2 mm; thickness, 3.7 mm. Notes: Catalog no. 2351a535-2, North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Steve Davis. Source: Objaverse 1.0 / Sketchfab
shell openScan test 1 - openScanCloude
300 images taken using the OpenScan Classic setup (3 passes with each 100 images) and a Canon EOS M6 markii with a EF-M 28mm f/3.5 Macro IS STM lens. A simple LED ringlight was used during shooting. images were uploaded to the openScanCloud with no further processing. the same images processed with metashape: https://sketchfab.com/3d-models/shell-openscan-test-1-metashape-7349c5cad1d8450f8cc4dd3af4854c34 Source: Objaverse 1.0 / Sketchfab
Shell Gorget (2342a3369)
**Shell gorget** Location: Hairston site (31Sk1), Stokes County, North Carolina. Period: Late Woodland (AD 1500-1600). Material: marine shell. Dimensions: length, 76.0 mm; width, 64.9 mm; thickness, 3.2 mm. Notes: Catalog no. 2342a3369, North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Abigail Gancz. Source: Objaverse 1.0 / Sketchfab
Shell Beads (1948a44)
**Small barrel-shaped shell beads (n=465)** Location: Sellers site (31Cy42), Clay County, North Carolina. Period: Mississippian, Qualla phase (AD 1400-1600). Material: marine shell. Dimensions: for scale, the label in the model is 88.2 mm long. Notes: Catalog no. 1948a44. Please note shape distortion along the lower edges of the beads. North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Abigail Gancz. Source: Objaverse 1.0 / Sketchfab
St Johns Shell Punctated Sherd
St Johns Sherd, ca. 750 AD-1565, sponge spicule tempered, shell-marked. Found during the 2021 excavations at Fort Mose Historical Site. To learn more visit :https://fortmose.org/ Model by Charlie Hall This model was made with RealityCapture software by Capturing Reality Source: Objaverse 1.0 / Sketchfab
Engraved Shell Gorget (2342a3399)
**Engraved shell gorget** Location: Hairston site (31Sk1), Stokes County, North Carolina. Period: Late Woodland (AD 1500-1600). Material: marine shell. Dimensions: length, 56.8 mm; width, 52.5 mm; thickness, 3.2 mm. Notes: Catalog no. 2342a3399, North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. llustrated in *Time Before History: The Archaeology of North Carolina,* by H. Trawick Ward and R. P. Stephen Davis, Jr., University of North Carolina Press, Chapel Hill, 1999, Figure 4.18. Model by Steve Davis. Source: Objaverse 1.0 / Sketchfab
Turtle Shell Cup (2270a1857)
**Turtle shell cup** Location: Upper Saratown site (31Sk1a), Stokes County, North Carolina. Period: Historic, Saratown phase (AD 1650-1670) Material: bone. Dimensions: length, 106.8 mm; width, 89.6 mm; thickness, 39.0 mm. Notes: Catalog no. 2270a1857, North Carolina Archaeological Collection, Research Laboratories of Archaeology, University of North Carolina at Chapel Hill. Model by Abigail Gancz. Source: Objaverse 1.0 / Sketchfab
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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)
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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.