Onychocrinus ulrichi
Flexibilia, Taxocrinda
Geological Time: Lower Mississippian Osagean Stage (345 m.y.a)
Size: Crown: 15 mm long by 20 mm wide stem: 12 mm on a 43 mm by 40 mm matrix
Fossil Site: Crawfordsville, Indiana Crinoids
 Description:
This unusual crinoid is a member of the Flexibilia, or flexible crinoids
known as Onychocrinus exculptus. These alien-looking crinoids derive
the group name for obvious reasons. Crinoids such as these are easily
disarticulated, but this one is quite intact, preserved in a fine
3-D aspect. The reverse of this plaque is a “hash” of
stem parts, often all that remains of these wonderful echinoderms. |
