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Gryphaea arcuata incurva 3D Model
The specimen is both an oyster and a bivalve, with a calcite shell. It existed from the Lower Triassic to Lower Jurassic ~185Ma. Over time the shell of the family became more flat, thinner and bigger. More stable food supply allowed for an increase in shell size. It was a suspension feeder, with a diet of plankton and small organic debris. The organism was epifaunal and sessile as it lived free lying on soft sediment.
Links for extra information and references: https://sites.google.com/site/fossilsoftheeastyorkshirecoast/collections/gryphaea http://www.southampton.ac.uk/~imw/liasfos.htm Invertebrate Paleontology, W. H. Easton, 1960, Harper’s Geoscience Series, Carey Croneis, Harper & Row Publishers, New York/London