1937  Branneroceras Plummer & Scott: 218.
     1950  Tschungkuoceras Gerth: 264.
     1957  Gastrioceras Hyatt.-Treatise: L61.
     1960  Branneroceras.- Ruzhentsev: 217.
     1962  Branneroceras.- Osnovy: 381.
     1962  Gastrioceras (Branneroceras).- Kullmann: 86.
     1968  Branneroceras.- McCaleb: 59.
     1975  Branneroceras.- Nassichuk: 139.
     1982  Branneroceras.- Nishida & Kyuma: 23.

Type species: Gastrioceras branneri Smith, 1896, p. 257 [OD].

[= Tschungkuoceras Gerth, 1950, p.264, type Gastrioceras perornatum YIN, 1935, p.25, OD (subj.), for discussion see MC
CALEB, 1968, p.64].

A:   Conch form evolute, with wide or moderately wide umbilicus. Coiling maybe slightly irregular.
C:   Ribs transversely elongate, fasciculating into several weak ribs.
B:   Growth striae biconvex, crossed by fine longitudinal lirae producing crenulate appearance.
G:   Branches of ventral lobe narrow; height of median saddle about three quarter of entire ventral lobe. (For discussion see
NASSICHUK, 1975, p.139].
 
[Nassichuk, 1975, p.139: Branneroceras is typically narrow and evolute. At a diameter
of 38 mm the holotype of the species (USNM 26439) has a conch width of 14.5 mm (W/D 38
per cent) and an umbilical diameter of 21.5 mm (U/D 57 per cent). In some species, W/D
approximates 50 per cent and U/D 30 per cent. Inner whorls are generally circular but
may be triangular or even quadrangular. Laterally elongate ribs extend from the umbilical
shoulder onto the lateral flanks and persist to full maturity. Shell ornament is reticulate
and growth lines form a ventral sinus and a ventrolateral salient. The external suture is
distinctly gastrioceran and is characterized by narrow, inflated and attenuate ventral
prongs that are separated from one another by a relatively broad secondary ventral saddle;
the ventral saddle is more than half the height of the first lateral saddle. The first
lateral saddle is broad and evenly rounded and the first lateral lobe is comparatively
narrow, asymmetric and attenuate].