Unknown pennsylvanian period fossil. I was told it was a distant relative of extant cnidarians

[paleonick]

I found this odd looking fossil while looking for complete pennsylvanian crinoids.  I've shown a handful of people and a paleontologist told me that it was the fossil of an extinct lineage of cnidarians and that it was quite rare ro find.  You can see a central line with additional lines radiating out from the central line.  Any help would be greatly appreciated!  Thanks in advance.

[Missourian]

It looks like a portion of a conularid, which has been interpreted as a cnidarian.

 

https://dnr.mo.gov/document-search/conulariid-jellyfish-pub2916/pub2916

 

Example from the Pennsylvanian Winterset Limestone, Kansas City, Missouri:

[Fossildude19]

Nice conularid!