Order Ptychopariida, Family uncertain
Time: Upper Middle Cambrian
mm with axial spine
Site: Weeks Formation, Millard County, Utah
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 rediscription in a dissertation
in 2003, where the current name was used. We do not have access
to the pertinent literature reference to know if it was assigned
to the same Family as Cedaria (Cedariidae) or some other trilobite
family. Gerospina has many similarities to another rare trilobite,
Norwoodia bellaspina (Ptychopariida, Norwodiidae), but that may
be more a result of evolutionary convergence than anything else.
Whatever its affinities, it is a most rare trilobite, seen here
in pristine condition with no restoration.
trilobite pictures to enlarge