Exogyra
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| Exogyra | |
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| A specimen of Exogyra flabellata (from the Owl Creek Formation, Late Cretaceous, of Ripley, Mississippi) | |
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| Genus: | †Exogyra
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†Exogyra is an extinct genus of fossil saltwater clams, marine bivalve mollusks in the family Gryphaeidae, the foam oysters or honeycomb oysters.[1] These bivalves grew cemented by the more cupped right valve. The left or upper valve is flatter, and the beak is curved to one side. Exogyra lived on solid substrates in warm seas.
Species
Species within the genus Exogyra include:
- Exogyra cancellata
- Exogyra costata
- Exogyra columba
References
- ^ http://crnmac1.physics.uiowa.edu/fossils/oysters/ilymatogyra/Exogyra-plexa.html Evolution of Exogyra plexa
- National Audubon Society Field Guide to North American Fossils