File:Exogyra costata (uppermost Cretaceous; Myrtle Beach area, eastern-coastal South Carolina, USA) (15042973429).jpg

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Exogyra costata from the Cretaceous of South Carolina, USA (7.0 cm across at its widest) - lateral view of left valve (dorsal at top; ventral at bottom).

Some fossil oysters attained rather strange-looking shells when compared to modern forms. A famous example is the Mesozoic-aged fossil oyster called Exogyra costata (Animalia, Mollusca, Bivalvia, Pteriomorphia, Pterioida, Ostreina, Ostreoidea, Gryphaeidae), first named by Thomas Say in 1820.

Exogyra costata is a distinctive, large fossil oyster that’s relatively common in some Mesozoic marine successions. The coiling of Gryphaea fossil oyster shells (see elsewhere in this album) is very close to being planispiral (the shell wraps around itself, within a plane, as it coils). The coiling in Exogyra (seen here) is more akin to that seen in gastropod shells (snail shells), where coiling is trochospiral (a.k.a. conispiral) (the shell moves outside a plane as it coils).

Stratigraphy: Maastrichtian Stage, upper Upper Cretaceous.

Locality: Myrtle Beach area, eastern-coastal South Carolina, USA.

Much info. from:

Stenzel (1971) - Oysters. Treatise on Invertebrate Paleontology, Part N, Mollusca 6, Bivalvia, Volume 3.
Date
Source Exogyra costata (uppermost Cretaceous; Myrtle Beach area, eastern-coastal South Carolina, USA)
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15042973429. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

6 May 2015

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