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Exogyra cancellata (Stephenson 1914) Oyster left valve - interior and exterior
(DSM# FK110) Extinct genus of marine bivalve that lived on solid substrates.
Exogyra costata (Say 1871) Oyster right/left valve
(no DSM#) Extinct species - This oyster that is extremely common in the Late Cretaceous strata of North Mississippi. Sometimes you can find these creatures encrusting other organisms.
Exogyra costata (Say 1871) showing damage to growth lines.
Exogyra costata are commonly found in the Cretaceous strata in northeast Mississippi. This example from the Dunn-Seiler Museum shows damage to the growth lines that were repaired as the creature grew.
Exogyra costata (Say 1971) Oyster left valve - interior and exterior
(DSM# M157/FK319) Extinct genus of marine bivalve that lived on solid substrates.