Exogyra costata Say, 1971 - GBIF.
Exogyra is an extinct genus of fossil marine oysters in the family Gryphaeidae, the foam oysters or honeycomb oysters. These bivalves grew cemented by the more cupped left valve. The right valve is flatter, and the beak is curved to one side. Exogyra lived on solid substrates in warm seas during the Jurassic and Cretaceous periods.
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Exogyra, extinct molluscan genus common in shallow-water marine deposits of the Jurassic and Cretaceous periods (from about 200 million to 65.5 million years ago). Exogyra is characterized by its very thick shell, which attained massive proportions. The left valve, or shell, is spirally twisted.
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Exogyra definition is - a genus of Upper Jurassic and Cretaceous bivalve mollusks that have thick shells and spirally twisted beak and are related to the true oysters.
Define Exogyra. Exogyra synonyms, Exogyra pronunciation, Exogyra translation, English dictionary definition of Exogyra. n. 1. A genus of Cretaceous fossil shells allied to oysters Exogyra synonyms, Exogyra pronunciation, Exogyra translation, English dictionary definition of Exogyra.
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Exogyra sp. (Say) The oysters Exogyra and Pycnodonte were the most common bivalves of the Cretaceous period. Lying on the seabed floor with the convex side in the mud and the flat side position at the seafloor surface for camouflage.
Essay Classification Information For Marine And Fresh Waters. Kingdom: Animalia Phylum: Porifera Classification information for Poriferans: Poriferans, better known as sponges, consist of 5000 known species, all located primarily in marine and fresh waters (Myers, 2001a). They are multicellular, heterotrophic, invertebrates with an irregular.
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List of some of the more common molluscs, with links to detailed information.
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