Bisatoceras MILLER et OWEN, 1937

Genus Bisatoceras MILLER et OWEN, 1937 View in CoL

T y p e s p e c i e s. Bisatoceras primum MILLER et View in CoL OWEN, 1937; by original designation.

D i a g n o s i s. Genus of the family Bisatoceratidae with subdiscoidal conch and very narrow or closed umbilicus. Ornamentation of transverse growth lamellae which form ventral and lateral sinuses and ventrolateral and dorsolateral salients. Constrictions present in early ontogenetic stages, but absent at maturity. Prongs of the ventral lobe are accuminate and inflatted and are broader than the first lateral saddle. The secondary ventral saddle is nearly as high as the rounded lateral saddle and is narrow and accuminate and the umbilical lobe is shallow and rounded (after Nassichuk 1975).

S p e c i e s i n c l u d e d. B. akiyoshiense NISHIDA, 1971 View in CoL , Akiyoshi ( Japan); B. baraiense SOBOLOEV in SOBOLEV et al., 1998, Verkhoyansk Ridge (Siberia, Russia); B. elegantulum RUAN, 1981 , Guangxi ( China); B. greenei MILLER et OWEN, 1939 View in CoL , Missouri ( USA); B. hoeni NASSICHUK, 1975 View in CoL , Canadian Arctic Archipelago ( Canada); B. huashibanense YANG, 1978 , Guizhou ( China); B. kotti NASSICHUK, 1975 View in CoL , Canadian Arctic Archipelago ( Canada); B. micromphalus MCCALEB, 1968 View in CoL , Arkansas ( USA); B. nevadense GORDON, 1969 View in CoL , Nevada ( USA); B. primum MILLER et OWEN, 1937 View in CoL , Oklahoma ( USA); B. qixuense RUAN, 1981 , Guangxi ( China); B. renni NASSICHUK, 1975 View in CoL , Canadian Arctic Archipelago ( Canada); B. solominae POPOW, 1970 View in CoL , Kolyma Ridge (Siberia, Russia); B. vidnayense POPOV et KUSINA, 1993 , Novaya Zemlya ( Russia); B. vulgare RUAN, 1981 , Guangxi ( China).

S t r a t i g r a p h i c r a n g e. Late Serpukhovian to Gzhelian.