Gerospina
schachti
Trilobites
Order Ptychopariida; Family uncertain
Geologic
Time: Upper Middle Cambrian
Size (25.4mm=1
inch): 14 mm long by 13 mm wide with a 23 mm axial spine on a 95 mm by
70 mm matrix
Fossil Site:
Weeks Formation, Millard County, Utah
Code: UB264
Price: Sold
|  Description:
This trilobite is a recently-described genus which had previously
been assigned to Cedaria based upon incomplete specimens. As a consequence
newer, more complete material led to a re-description in a dissertation
in 2003, where the current name was used. I do not have access to
the pertinent literature reference, so I do not know if it was assigned
to the same Family as Cedaria (Cedariidae) or some other. It also
has many similarities to another rare trilobite, Norwoodia bellaspina
(Ptychopariida, Norwodiidae), but that may be more a result of convergence
than anything else. Whatever its affinities, it is a most rare trilobite,
seen here in pristine condition with only restoration to part of
the axial spine.
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