Pennsylvanian/Permian crinoids

[Mochaccino]

Hello,

 

I have a whole bunch of unidentified crinoids I'd like some help identifying. From my guess on the species and the fact that there were all together (as well as the other specimens that came with it), my guess is that these are Pennsylvanian or Permian-aged crinoids from Texas or Kansas. I'm hoping narrowing down the ID would better pinpoint the provenance for them.

 

Here goes. The calyxes all range from 1-2 cm wide.

 

I did attempt to ID them, using resources including this by the forum's @Missourian:

 

 

#1-#4 I think are all of the same species or at least genus. I'm inclined to say either Delocrinus or Graffhamicrinus, which are similar-looking genuses.

 

1.

 

 

2.

 

 

3.

 

 

4.

 

 

5. This one is a bit unusual in that it seems to have some arm bits preserved, which look like thick spikes. It's a bit crushed but I think based on the calyx pattern it could still be a Delocrinus or Graffhamicrinus.

 

 

 

6. This one has a basal plate pattern like Delocrinus or Graffhamicrinus, but has unusual spines coming off of the radial plates.

 

 

The following 3 specimens (#7-9) look similar to the above calyxes, but I noticed they somehow seem more globular and rounded. They may be the same genus/species and just variants, or a different genus/species. For instance, if the above are Delocrinus, perhaps these are Graffhamicrinus?

 

7.

 

 

8.

 

9.

 

 

The following four (#10-13) are clearly different from the above. Each has a clear infrabasal circlet and stem attachment, plus the calyx expands towards the top, which gives it a more cone-like appearance. These may be Bathronocrinus according to this: http://inyo2.coffeecup.com/kansasfossils/crinoids2.html

 

10.

 

11.

 

 

12. This one has some proximal arm bits still attached.

 

13.

 

 

This next one has very bulbous/swollen calyx plates, which are especially noticeable from the side view. Perhaps a Galateacrinus according to Missourian's diagram?

 

14.

 

 

15. The plate structure is harder to tell on this one, but it has slightly swollen basal plates that form dimples/notches where they meet the radial plates. This is clear on the side profile. I honestly have no idea what this one could be.

 

 

 

16. This one has no plating texture, and I'm thinking it looks like the basal plate of the floating crinoid known as Paragassiocrinus, which is known from Texas. If so, and it is specific to Texas, perhaps I can attribute all these specimens to the Pennsylvanian of Texas as well.

 

 

 

17. An odd specimen, might be a set of basal plates.

 

 

 

18. This seems to be a stem and basal plates.

 

 

19. These seem like spines from the anal tube or "umbrella" of a crinoid such as Plaxocrinus (https://www.google.com/search?q=plaxocrinus&sxsrf=ALiCzsbwpZnGPNxgLHUJ4758h1D4GTNkKQ:1669188769957&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjM5sjd5MP7AhWmKkQIHb3vAIkQ_AUoAXoECAEQAw&biw=1257&bih=764&dpr=2#imgrc=atyg4qzOxLWjRM).

 

20. I'm unsure if this is from a crinoid, but it might be part of a spine.

 

 

 

21. This one I placed separately because the color of the calyx and matrix are different from all the rest, and so it may be from a different locality. Species-wise it looks similar to the first 9 specimens I posted, so it may be a Delocrinus or Graffhamicrinus.

 

Edited November 23, 2022 by Mochaccino

[Mochaccino]

@Missourian I quoted you again in case that first one that I edited in didn't work.

[historianmichael]

https://www.dallaspaleo.org/resources/Documents/PGUPFT 4 echinodermata.pdf

[Mochaccino]

3 hours ago, historianmichael said:

https://www.dallaspaleo.org/resources/Documents/PGUPFT 4 echinodermata.pdf

 

Oh wow thank you!