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Please help with Crawfordsville Crinoid Holdfast Species


georocks58

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Hello, I believe this to be a "holdfast" from the Crawfordsville Indiana crinoid locality.  I am hoping that someone could help with identification of the particular species, and also if there is a scientific name for "holdfast."  Thank you!

2021-02-19 15-16-30 (A,Radius8,Smoothing4).jpg

2021-02-19 15-17-20 (A,Radius8,Smoothing4).jpg

2021-02-19 15-17-53 (A,Radius8,Smoothing4).jpg

2021-02-19 15-18-22 (A,Radius8,Smoothing4).jpg

2021-02-19 15-19-00 (A,Radius8,Smoothing4).jpg

1211396569_2021-02-1915-19-48(ARadius8Smoothing4).jpg

1021599707_2021-02-1915-20-58(ARadius8Smoothing4).jpg

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I don't know much about crinoids, but is this the holdfast or the crown?  

 

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IsaacTheFossilMan

Looks like a crinoid's crown to me.

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Aha!  I just assumed from the presentation that it was a holdfast, could very well be mistaken.  Any idea of species?  Thank you!

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I can't help you with the genus or species of this nice crinoid, but as is was said before, it's not a holdfast (not because it hasn't the branching character) but because of the mono or biserial arrangement of plates of the  arms ( which is not proper for holdfast). Crinoid holdfasts have the same characters of their columns with the cirri branching. In fact, everything is based on the roots.

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23 hours ago, georocks58 said:

Aha!  I just assumed from the presentation that it was a holdfast, could very well be mistaken.  Any idea of species?  Thank you!

Crinoid crown= brachials and calyx of the crinoid.

Looks like a flexible member, you might consider Onychocrinus exculptus? 

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