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Exogyra vs Gryphaea


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I'm studying fossils and I'm having a difficult time understanding the visual(and structural) differences between Exogyra and Gryphaea.  Any insights would be very much appreciated! :)

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Not sure if you came across this at all.

This PDF may help as well. 

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Without using pictures i would say that in Gryphaea the lower, or larger, shell curves back up over the hinge point. In Exogyra the shell coils like a snail down and away from the hinge. 

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