1930 Prototoceras Spath: 8,
---- Discotoceras Spath: 8.
1959 Prototoceras.- Ruzhencev: 61,
---- Discotoceras.- Ruzhencev: 64.
1962 Prototoceras.- Ruzhencev: 95.
1978 Prototoceras.-Zhao, Liang & Zheng: 92.
1979 Prototoceras.-Bando: 127.
2002 Prototoceras.-Leonova: S107; synonyma: Discotoceras, Urartoceras, Vescotoceras, Jinjiangoceras.

Type species: Ceratites tropitus Abich, 1878 [=Otoceras trochoides Abich, 1900, non Ceratities trochoides Abich, 1878 -
texte Ruzhentsev, 1959, p.61].

[Spath, 1930, p.8: More or less involute, smooth, subdiscoidal shells with flared umbilical rim and fastigate venter.
Suture-line with undivided external lobe, as in Anderssonoceras, but ceratitic lateral lobes and irregularly divided auxiliaries.]

[Ruzhentsev, 1959: The shell is more or less wheel shaped, from moderately to strongly involute, with tectiform ventral side.
The umbilicus is of various dimensions, with a strongly or weakly drawn off margin. The ventral lobe is always comparatively
short. The primary umbilical lobe is well developed, much deeper than the ventral lobe, and with numerous serrations at the
base. The next lobe from it is much more weakly developed.

It differs from genera Araxoceras and Rotaraxoceras in a number of peculiarities, but chiefly in a tectiform ventral side and a shallower ventral lobe.]

Ruzhentsev 1962, p. 95, Protoceras:
Conch large, wheel-shaped to disc-shaped, with wide or quite wide whorls (width/diameter = 0.3 to 0.5) and roof-shaped venter. Umbilicus average sized (umbilicus diameter/shell diameter 0.15 to 0.2), with slightly protruding or completely inconspicious venter. Ventral lobe relatively short. First saddle not very wide. First umbilical lobe well developed, much longer than the ventral one, serrated at the base. Second umbilical lobe twice as short as the first, also serrated at the base. Small lobes, some two-pronged, follow up to the umbilicus.