Exogyra: Difference between revisions
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'''''Exogyra''''' is an extinct genus of [[bivalve]] [[mollusk]]s in the family [[Gryphaeidae]], the foam oysters or honeycomb oysters |
'''''Exogyra''''' is an extinct genus of [[bivalve]] [[mollusk]]s in the family [[Gryphaeidae]], the foam oysters or honeycomb oysters.<ref>http://crnmac1.physics.uiowa.edu/fossils/oysters/ilymatogyra/Exogyra-plexa.html Evolution of ''Exogyra plexa''<!-- Bot generated title --></ref> These bivalves grew cemented by the 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. |
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==Species== |
==Species== |
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Revision as of 08:31, 17 December 2011
| Exogyra | |
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| Exogyra flabellata (Owl Creek Formation, Late Cretaceous, Ripley, Mississippi) | |
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| Genus: | Exogyra
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Exogyra is an extinct genus of bivalve mollusks in the family Gryphaeidae, the foam oysters or honeycomb oysters.[1] These bivalves grew cemented by the 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
- 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