Nautilida

New family Korn & Hairapetian (in press) Diagnosis Family of the superfamily Grypoceratoidea with a usually discoidal, subinvolute conch. Whorl profile in the adult stage weakly compressed or weakly depressed; flanks and venter usually separated by a distinct ventrolateral shoulder, venter more or less concave. Umbilical margin usually subangular or angular, rarely rounded; umbilical wall steep, often flattened. Ornament usually consisting of fine growth lines. Septum simple in shape, concavely domed; suture line depending on whorl profile with shallow to V-shaped external lobe and shallow lateral lobe (from Korn & Hairapetian in press: 14). Included genera Pseudotitanoceras Shimansky, 1965 (Permian); new genus A to be described by Korn & Hairapetian (in press) (Permian); new genus B to be described by Korn & Hairapetian (in press) (Permian); Azarinautilus gen. nov. (Permian). Remarks A detailed discussion of the new family will be given by Korn & Hairapetian (in press).