Asaphus holmi Russian Trilobite

Asaphus holmi is one of the moderately scarce Russian Asaphids, and near the end of an evolutionary branch decended from Asaphus cornutus. At about 4 1/2 inches in length, it is also near the size limit for the species. It sets fully stretched and inflated centered on a large piece of Ordovician seafloor.

Also see: Russian Asaphida Trilobites Russian Trilobites Russian Asaphidae Evolution Sequence