Saturday, November 29, 2014

Platyceras conicum from the Centerfield member

Among my recent finds from the Centerfield member of the Ludlowville formation is this specimen of Platycers conicum. As you can see it has a very vertical profile with little to no curving of the shell. As it is well known that some species of Platyceras were parasites of Crinoids, by stationing themselves directly above the anal pore so as to get free meals, perhaps this conical shape was adapted towards a specific Crinoid species?

I've found similar examples in the Hungry Hollow member of the Widder formation in Canada.

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