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About: Bisatoceras     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : dbo:Mollusca, within Data Space : dbpedia.org associated with source document(s)

Type: mollusca New Facet based on Instances of this Class

Bisatoceras is a late Paleozoic (Upper Mississippian - Upper Pennsylvanian) Ammonoidea, a member of the goniatitid family Bisatoceratidae. Bisatoceras was named by Miller and Owen in 1937 and has a subdiscoidal shell with a very narrow or closed umbilicus. Whorl height exceeds with at maturity, immature growth stages are globular. Growth lines are usually biconvex, forming ventral and lateral sinuses. Two or three lateral constrictions are formed on each whorl during early growth stages but constrictions are absent at full maturity. The ventral lobe of the suture is double pronged with the median saddle exceeding two thirds the height of the lobe itself.