''Branneroceras'' is a goniatitid genus from the Late Carboniferous (Middle -Late

Pennsylvanian Pennsylvanian may refer to: * A person or thing from Pennsylvania * Pennsylvanian (geology) The Pennsylvanian ( , also known as Upper Carboniferous or Late Carboniferous) is, on the International Commission on Stratigraphy, ICS geologic timesc ...

). Their fossils have been found in Nunavut, Canada, and in Arkansas and Texas, USA.

Taxonomy

''Branneroceras'' has been assigned to the Schistoceratidae,''Branneroceras'' in Fossilworks Gateway
/ref> a family on goniatitid

ammonoids Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family N ...

included in the Schistocerataceae, now Schistoceratoidea. At one time ''Branneroceras'' was regarded as a subgenus of ''

Gastrioceras ''Gastrioceras'' is a goniatitid genus in the family Gastrioceratidae that lived during the late Carboniferous (Pennsylvanian and for most of the Permian. Taxonomy ''Gastrioceras'' is assigned to the Gastrioceratidae, a family that makes up par ...

'', ''Gastrioceras (Branneroceras)'', but ''Gastrioceras'' is included in the

Gastrioceratidae Gastrioceratidae is one of five Family (biology), families of the Gastrioceratoidea superfamily. They are an extinction, extinct group of ammonite, ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, ...

.''Gastrioceras'' in Fossilworks Gateway
/ref> The type species for ''Branneroceras'' is ''Gastrioceras branneri'' Smith, 1896.

Morphology

The shell of ''Branneroceras'' is typically narrow, evolute, with a wide or moderately wide umbilicus. Coiling maybe slightly irregular. The surface has a crenulate appearance produced by biconvex growth lines crossed by fine longitudinal, wirelike, lirae. Ribs extend Laterally from the umbilical shoulder onto the lateral flanks and persist to full maturity. Growth lines form a ventral sinus and a ventrolateral projection or salient.
/ref> The ventral lobe at maturity is double pronged. Prongs are narrow, separated by a median saddle three quarters the height of the entire lobe.

References

Goniatitida genera Schistocerataceae Paleozoic life of Nunavut {{Goniatitida-stub