Crinoid Calyx ID

[Finagin]

[Finagin]

Trying to confirm ID for these two crinoid calyx's from the Paint Creek Fm., Millstadt, IL 

My guess is

Pterotocrinus for the first one 

Possibly 

Onychocrinus for the second

If I'm wrong please help me out. 

Would like the species name if possible.  Finagin 

[Finagin]

[Finagin]

Just now, Finagin said:

Here is a third calyx from the same site.  ID for me please.  Finagin 

[Jaybot]

Sorry, I can't help... I will say though, the preservation on the 3rd one is incredible!

 

@crinus

[crinus]

 

The only crinoid here that looks like it could be from Millstadt is the second crinoid which does look like a Onychocrinus. 

But there is also a good chance that it also is not Millstadt.  Hard to tell without having it in hand. 

 

The other two look to be Alabama crinoids.  The third one is definitely a Platycrinus penicillus from Alabama. 

 

The first one is definitely not a Pterotocrinus.  Probably a Tholocrinus.

 

Joe

[Mochaccino]

Unless you are 100% certain about provenance, I agree with @crinus on the likely provenances. With these assumptions I believe the first one is an immature Zeacrinites. Based on the matrix and preservation it looks to be from the Lower Bangor Formation of Alabama, and the species typically found here is Z. wortheni.
 

I agree the second is probably an Onychocrinus, but could not give you the species until I've looked into the literature. Knowing the provenance would help.

 

The third looks like a Platycrinites from the Monteagle Limestone of Alabama and P. penicillus (technically a junior synonym of P. huntsvillae) is the one typically found from here, but again without looking into descriptions I cannot say definitively. Your specimen appears a little more ornate than what I typically see, but calyx ornamentation can be variable within a species.

 

Gabe Ward @crinoid1 is the Chesterian crinoid expert and should be your best bet for these.

Edited November 25, 2024 by Mochaccino

[crinus]

12 hours ago, Mochaccino said:

Unless you are 100% certain about provenance, I agree with @crinus on the likely provenances. With these assumptions I believe the first one is an immature Zeacrinites. Based on the matrix and preservation it looks to be from the Lower Bangor Formation of Alabama, and the species typically found here is Z. wortheni.
 

 

Looking at that one again, I have to agree that it is a Zeacrinites.  Thanks Sam for the correction.

Joe