Proteusites

Proteusitesis type genus for the Proteusitidae, a family of ceratitid ammonites included in the Ceratitaceae characterized by a generally involute shell in which overlap is variable. Whorl sections are somewhat depressed, wider than hight, with an arched venter. May have fold-like ribs and umbilical tubercles.

At one time Proteusites stood alone as the sole representative of the Proteusitidae. It has been found in lower middle Triassic formations in such places as the Balkins, Himalaya, and Alaska.