Crinoid ID Help

[Bill Dye The Travis Guy]

Hello! Looking to see if anyone can tell me what species these crinoids are!
It was found in O’Fallon, Missouri. Mississippian Period limestone rock outcropping (road cut). 
Specific location: (38.8189493, -90.7276743) 

These are the same fossil ^^^^

 

These three are the same^^^

Edited January 12, 2023 by Bill Dye The Travis Guy

[Mochaccino]

Very cool finds! The first one actually looks to be an echinoid/urchin to me, but the second one definitely seems like a crinoid calyx. If it's the Mississippian of Missouri I'm guessing it's the Burlington or Keokuk Formation. The specimens and matrix do remind me of Burlington. @crinus is the crinoid/echinoderm expert and has collected the Burlington with some excellent specimens in his collection, so he would be the one to ask for exact identification. 

 

I'm no expert but my personal guess is that the echinoid might be something like Lovenechinus. For the crinoid it's a bit hard to see because of the matrix, but the lobation of the calyx reminds me of something like Steganocrinus, Actinocrinites, or Agaricocrinus. I'm not sure if the dorsal side is concave/depressed or simply missing, could you get some photos looking straight-in from the top and bottom of the calyx?

 

 

Edited January 12, 2023 by Mochaccino

[Bill Dye The Travis Guy]

7 minutes ago, Mochaccino said:

Very cool finds! The first one actually looks to be an echinoid/urchin to me, but the second one definitely seems like a crinoid calyx. If it's the Mississippian of Missouri I'm guessing it's the Burlington or Keokuk Formation. The specimens and matrix do remind me of Burlington. @crinus is the crinoid/echinoderm expert and has collected the Burlington with some excellent specimens in his collection, so he would be the one to ask for exact identification. 

 

I'm no expert but my personal guess is that the echinoid might be something like Lovenechinus. For the crinoid it's a bit hard to see because of the matrix, but the lobation of the calyx reminds me of something like Steganocrinus, Actinocrinites, or Agaricocrinus. I'm not sure if the dorsal side is concave/depressed or simply missing, could you get some photos looking straight-in from the top and bottom of the calyx?

 

 

Thank you! And yes I’ll add a new picture soon here!

[Bill Dye The Travis Guy]

16 minutes ago, Mochaccino said:

Very cool finds! The first one actually looks to be an echinoid/urchin to me, but the second one definitely seems like a crinoid calyx. If it's the Mississippian of Missouri I'm guessing it's the Burlington or Keokuk Formation. The specimens and matrix do remind me of Burlington. @crinus is the crinoid/echinoderm expert and has collected the Burlington with some excellent specimens in his collection, so he would be the one to ask for exact identification. 

 

I'm no expert but my personal guess is that the echinoid might be something like Lovenechinus. For the crinoid it's a bit hard to see because of the matrix, but the lobation of the calyx reminds me of something like Steganocrinus, Actinocrinites, or Agaricocrinus. I'm not sure if the dorsal side is concave/depressed or simply missing, could you get some photos looking straight-in from the top and bottom of the calyx?

 

 

[Mochaccino]

4 minutes ago, Bill Dye The Travis Guy said:

 

It actually seems to be a complete calyx, with the dorsal side just concave. So seems most likely an Agaricocrinus, which has a very characteristic lobed calyx with a flat/concave dorsal side. Might be Agaricocrinus planoconvexus. But I would wait for an expert opinion. 

 

For the echinoid unfortunately I'm less familiar and can't really give further help.

 

[Bill Dye The Travis Guy]

1 minute ago, Mochaccino said:

 

It actually seems to be a complete calyx, with the dorsal side just concave. So seems most likely an Agaricocrinus, which has a very characteristic lobed calyx with a flat/concave dorsal side. Might be Agaricocrinus planoconvexus. But I would wait for an expert opinion. 

 

For the echinoid unfortunately I'm less familiar and can't really give further help.

 

Thank you for the help! And that large one really looks like a echinoderm the more I look at it. I’ll be actually glad I misidentified it because it will be a new animal find for me!

[TqB]

The beautiful echinoid is indeed Lovenechinus, probably L. missouriensis which is the type species of the genus and known mainly from the Burlington Group in Missouri. 

Edited January 12, 2023 by TqB

[Bill Dye The Travis Guy]

1 hour ago, TqB said:

The beautiful echinoid is indeed Lovenechinus, probably L. missouriensis which is the type species of the genus and known mainly from the Burlington Group in Missouri. 

Awesome! Thanks for the ID!

[crinus]

Agaricocrinus is correct for the calyx.  Nice echinoid.  I'm jealous.

Joe