Monocyrtoceras

Monocyrtoceras is an armenoceratid, (Cephalopoda), from the Middle Silurian of North America, (Wisconsin), with a gently curved shell and a siphuncle like that of Elrodoceras. According to Teichert, 1964, in the Treatise part K, Monocyrtoceras along with Elrodoceras and Armenoceras forms one of the two branches of the Armenoceratidae.

Monocyrtoceras

Monocyrtoceras is an armenoceratid, (Cephalopoda), from the Middle Silurian of North America, (Wisconsin), with a gently curved shell and a siphuncle like that of Elrodoceras. According to Teichert, 1964, in the Treatise part K, Monocyrtoceras along with Elrodoceras and Armenoceras forms one of the two branches of the Armenoceratidae.