1974  Inzeroceras Ruzhentsev: 35.

Type species: Inzeroceras bellum Ruzhentsev, 1974, p.36 [OD].

A:   Conch discoidal, evolute, with wide umbilicus. No triangular coiling of early whorls.
B,F: Sculpture consisting of weak umbilical plications and well developed lirae.
G:   Ventral lobe fairly broad, divided by high median saddle into two lanceolate branches. Adventitious lobe pouched.
Lateral saddle forms rudimentary lobe on umbilical seam.

[In original description one species from one locality].

[Ruzhentsev, 1974, p. 35]: Subophioconic shell, with relatively broad, convex venter. Whorls moderately involute.
Umbilicus broad. Sculpture consisting of weak umbilical plicae and well-developed lirae.Ventral lobe fairly broad
(wl/hl= 0.95), divided by a high median saddle into two narrow lanceolate branches. Lateral lobe half the width,
asymmetrically dome shaped. Ending of umbilical lobe shifted onto lateral face; on crossing the umbilical seam it
forms a rudimentary lobe.Distinguished from Branneroceras by the weak development of umbilical plicae and by
the appreciably different outline of the suture: broader ventral lobe (wl/hl = 0.95 as against 0.65), high median
saddle (hs/hl = 0.74 as against 0.54), distinctive dome-shaped outline of the lateral lobe, and displacement of the
umbilical lobe to the lateral face. The genus Rodiezmoceras Wagner-Gentis, 1971, in which the umbilical lobe is also
displaced to the lateral face, has recently been described on the basis of Spanish material. Unfortunately, the type
species R. bisati W.-G. is represented by shell fragments, as a result of which we do not know whether or not there
was a stage of triangular coiling of the whorl. It is therefore difficult to say whether Rodiezmoceras preceded
Diaboloceras or Inzeroceras. At all events, our genus is distinguished from the Spanish one by weakly developed
sculpture and, in the suture contour, by the broad ventral lobe, the completely different contour of the lateral lobe,
and the development of an additional rudimentary lobe on the umbilical seam.