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dalmayshun

Can someone pin down this ochopee member shell

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dalmayshun

For awhile now, I have been trying to pin down this scallop. I think it is an argopecten, possibly comparilis, or evergladesensis, but the images I can find on line of those, seem to show ribs that are rounded on top. These shells have very  flat ribs, with a very slight indentation running down the center of each. The shells are offset a bit. I found them in the northern most edge of ochopee member of the Tamiami formation, along with euvola hemicyclica, and a really lovely little urchin test, the exact name of which I don't recall as I sit here typing. I have a collection of 30 different sizes I am trying to put together in a ryker box, but have not yet done so, because I just don't know the id...a friend suggested I check out dimarzipecten crocus....but that kind of obscure reference is wa-a-ay beyond me. I'd rather put to use someone's knowledge, if you know what it is, would you please take a moment and explain Why you i.d. it as you do. Much appreciated. 

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20180507_142840-picsay.jpg

20180507_142855-picsay.jpg

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SailingAlongToo

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Auspex

It's a beauty. Sometimes the hinge construction helps IDs. Do you have one already shucked?

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MikeR

Argopecten comparilis (Tuomey & Holmes, 1857).  LINK

 

It can be quite variable from the very inflated form jacksonensis to almost flattened ribs evergladensis, however Thomas Waller of the Smithsonian synonymized all within A. comparilis in his 1969 Paleontological Society Memior.

 

Mike

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Tidgy's Dad

That's a very beautiful scallop! :)

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MikeR

Definitely not Dimarzipecten crocus which is a Upper Oligocene/Lower Miocene species found in Florida and North Carolina. LINK Two Argopceten species are found in the Tamiami, A. comparilis and A. anteamplicostata.  The latter has wider and fewer ribs than yours.

 

Mike

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