Opis

Shell subdiscoidal to globular; adult stages with wide or moderately narrow umbilicus; umbilical shoulder with nodes, generally elongate transversely, sometimes combined with rather strong ribs; longitudinal lirae present in some forms; ventral lobe wide, deeply subdivided, moderately pouched, with asymmetrical prongs; height of median saddle exceeding half the height of entire ventral lobe.

Synonimy

Zasięg czasowy

Carboniferous; Bashkirian - Moscovian

Literatura

Hyatt, A. 1884. Genera of fossil cephalopods. Boston Society of Natural History, Proceedings 22: 253-338.