Scytalocrinus decadactylus, Lanecrinus depressus, Onychocrinus sp. Crawfordsville Crinoids
Geological Time: Lower Mississippian Osagean Stage
Size (25.4 mm = 1 inch): Scytalocrinus: crown: 60 mm long by 25 mm wide stem: 50 mm, Lanecrinus: crown: 15 mm long by 6 mm wide stem: 6 mm, Onychocrinus: crown: 14 mm long by 8 mm wide on a 130 mm by 80 mm matrix
Fossil Site: Crawfordsville, Indiana
Code: CK07
Price: $155.00 - sold
 Description:
The large crinoid is a fine example of an Inadunate Cladid crinoid
(Family Scytalocrinidae) known as Scytalocrinus decadactylus from
the famous Crawfordsville crinoid beds. Preservation on this specimen
is remarkably complete, down to the fine pinnules on the arms. What
is most interesting about this specimen is that several of the arms
show evidence of regeneration. While two have just the tips regrown,
one arm shows nearly 1/3 of its length having been regenerated. There
are two smaller crinoids present as well. The one in the lower right
of the first photo is an example of the genus Onychocrinus. While
only the faintest hint of its stem seems attached, there is a section
seen directly below the Scytalocrinus which may belong to it (see
the “bump’ in the matrix which appears to lead back to
the Onychocrinus). Finally, is seen on the reverse is a member of
the Decadocrinididae known as Lanecrinus depressus, formerly called
Dacadocrinus depressus, making for a wonderful example of the diverse
morphologies these wonderful echinoderms exhibited. This plaque is
another set of the very 3-D preserved crinoids for which the Crawfordsville
deposits are well known. |
