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What Kind Of Crinoid Is This?


Brandon82

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My son and I found this where we get a lot of horn coral and couldn't believe the size of it. Its roughly the size of a golf ball. We found this outside quincy Illinois in the bluffs of the Mississippi river

post-14721-0-95086200-1400550317_thumb.jpg

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It appears to be a small specimen of Amphoracrinus. This here is the calyx. The five lumps at the side were where the arms extended from (although Amphoracrinus arms are rarely preserved), and the central lump is a pronounced anal tube (rare on most crinoids). Amphoracrinus is from the Lower Carboniferous.

A similar form is Actinocrinites, although I'm pretty sure yours is Amphoracrinus (although it's a bit hard to see in the photo) - the way to tell is that Amphoracrinus has three basal, five radial, and five branchial plates in the lower part of the calyx; Actinocrinites has far more.

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I've seen smaller before and I thought this was huge.How much bigger can they be?

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Looks like a dorycrinus, but other pics from the side and cup will help

Edited by Archimedes
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