1975  Melvilloceras Nassichuk: 134.
     1979  Lutuginoceras Popov: 86.

Type species: Melvilloceras sabinense Nassichuk,1975,p.135 [OD].

Melvilloceras NASSICHUK, 1975, p.134 [= ? Lutuginoceras POPOV, 1979, p.86, type L. rotaii, p.86; OD (subj.)].

A:   Conch form moderately involute, with rather narrow umbilicus. Umbilical nodes present during early growth stages.
B,F: Ornamentation delicately reticulate; sinuous growth striae more conspicuous than longitudinal lirae.
D:   Four to six constrictions per whorl.
G:   Broad ventral lobe, with median saddle exceeding three quarters of height of entire ventral lobe.

[Lutuginoceras is based on the holotype of the type species only, possibly an immature specimen the suture of which is unknown; assignment to Melvilloceras or related genus probable*.

Popov's diagnosis of Lutuginoceras (1979, p.86): Conch pachycone, completely involute, with moderately tight umbilicus, which is covered by tiny, sharp nodes.  Thin growth lines form a deep ventral and a moderate lateral sinus and moderate salients in the ventrolateral and umbilical zones.  Spiral lirae thin, frequent, developed somewhat weaker than growth lines.  Constrictions thin, slight, up to 5 per whorl].
 
[Nassichuk, 1975, p.134: The conch of Melvilloceras is subdiscoidal and moderately involute; W/D is less than 45 per cent and U/D is less than 25 per cent. The venter is narrowly rounded and flanks are broadly rounded or flattened. Umbilical nodes are prominent during early growth stages but are subdued or absent beyond early maturity, shell ornament is delicately reticulate; growth lines are relatively more conspicuous than longitudinal lirae and form a moderately deep ventral sinus, a moderately high ventrolateral salient and a shallow, broad ventrolateral sinus. Four to six constrictions are parallel with growth lines to maturity. The external suture is characterized by ventral prongs that are attenuate and are separated from one another by a secondary ventral saddle that is greater than half the height of the broadly rounded first lateral saddle. The first lateral lobe is broad and pointed with straight or slightly curved sides].