Actinocrinites Plate or Echinoderm?

[Cassandra Tiensivu]

After cracking open this packstone, I happened upon this odd little fossil. I did a bit more excavating to uncover the extra lobe. So far, the speculation is leaning heavily toward some sort of Actinocrinites plate. There are a few people pondering echinoderms. 
 

What are the general thoughts here on this piece? 
 

From South Haven, Michigan. Mississippian Coldwater Shale. 

 

  

Edited May 30, 2021 by Cassandra Tiensivu
Adding location.

[Tetradium]

crinoid plate piece for sure. 

[Tetradium]

On 5/29/2021 at 6:27 PM, Cassandra Tiensivu said:

After cracking open this packstone, I happened upon this odd little fossil. I did a bit more excavating to uncover the extra lobe. So far, the speculation is leaning heavily toward some sort of Actinocrinites plate. There are a few people pondering echinoderms. 
 

What are the general thoughts here on this piece? 
 

From South Haven, Michigan. Mississippian Coldwater Shale. 

 

  

I don't know why no one else responded to you.  After all crinoids belong to the echinoderm family. The main problems nowadays is figuring out how to tell the different families apart by plate pieces or stem pieces alone as whole calyx which is used to tell what genus they belongs in is rare in some eons like Ordovician, Silurian, and some Devonian. With local Ordovician Decorah formation crinoids, I had only found one whole specimen and that's just a tiny one 2 inches high. By compare I had seen so many crinoid stem pieces and only a few plates. That tell us how difficult it is to figure  as there are so many families that makes up the "crinoid" tree.