Supremely Rare Gerospina Trilobite from Utah

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

Gerospina 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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