Crinoid ID

[Collector9658]

I am having trouble identifying this specimen.

I have not found or seen another like this, so I'm hoping someone will be more familiar with it than I am.

 

It looks clearly crinoidal like a calyx, and comes from the Burlington Formation of Missouri which contains a large fauna of crinoids.

I considered Rhodocrinus, but I don't think that is correct. The calyx looks like it has 2 rows of "spines".

 

I currently lack an air compressor and air abrader, so this specimen cannot be cleaned any further due to how fragile it is.

 

Any ideas?

 

Pictures with ruler

[ynot]

Crinoid calyx.

[Collector9658]

10 minutes ago, ynot said:

Crinoid calyx.

Yes, likely. I'm hoping someone may recognize the type it is.

Edited May 8 by Collector9658

[Fossildude19]

Cropped and contrasted:

 

 

 

 

 

 

 

 

[FossilDAWG]

@Archimedes @crinoid1 @crinus might have suggestions.  
 

Don

[Bullsnake]

Looking through Index Fossils of North America, the closest I could find is Batocrinus.

I'm certainly no expert, though. Just love to try.

 

[Fossildude19]

@Bullsnake - Looks like a good match to me!

 

 

Link To PAPER.

 

 

 

[Collector9658]

2 hours ago, Bullsnake said:

Looking through Index Fossils of North America, the closest I could find is Batocrinus.

I'm certainly no expert, though. Just love to try.

 

 

Thanks for the suggestion. I'll check some Batocrinus illustrative plates from the Burlington Limestone and add them here when I'm free from work later on.

 

Edit* 

Here is one I have handy of Burlington material. There are more though, and I'll add them later.

 

Edited May 8 by Collector9658
Add image

[Collector9658]

On 5/8/2024 at 11:06 AM, Bullsnake said:

Looking through Index Fossils of North America, the closest I could find is Batocrinus.

I'm certainly no expert, though. Just love to try.

 

 

 After some further comparison, I'm not sure if it is Batocrinus or not. It's an odd little calyx. I think I'll need to wait and buy another air compressor, or find someone with an air abbraider setup to do some gentle blasting on this specimen to ID it confidently. Or possibly someone else down the road will recognize it. I may reach out to crinoid expert Forest and see what he thinks.

 

 Ironically, looking back now at the illustrative plate I posted yesterday, I think one of the other specimens I haven't got around to IDing is actually a Batocrinus from that plate. I'll dig it out here in a bit and post it here, if you'd like to weigh your opinion.

 

Edit*

Here is the other calyx. I think it could possibly be Batocrinus clypeatus, or possibly Batocrinus lepidus. I'll need to do some reading and see if those are still up to date, check their descriptions, then check back as well.

Edited May 9 by Collector9658
Add photos

[Bullsnake]

Anxious to see what the members that @FossilDAWGtagged have to say.