1967  Clistoceras Nassichuk: 240.
     1975  Clistoceras.-Nassichuk: 91.
     1991  Clistoceras.-Liang & Wang: 122.

Type species: Clistoceras globosum Nassichuk, 1967, p. 241 [OD].

A:   Conch small, evolute on early whorls, at maturity globular. Umbilicus closed on late growth stages by thickening of the
primary shell at the umbilical shoulder and by helicolateral deposits.
B:   Faint growth lines, on young stages sinuous, at maturity slightly biconvex, with shallow ventral sinus.
D:   One or more constrictions per whorl.
G:   Median saddle about half as high as entire ventral lobe; first lateral saddle subacute. Umbilical portion of lateral lobe
exhibits an incipient flexure, caused by the helicolateral deposits.

[Only type species known].

[Nassichuk, 1975, p.91: The conch of Clistoceras is fusiform during early growth stages but is globular at maturity. The venter tends to become progressively more narrowly rouded during ontogeny. The conch has a narrow umbilicus which in some species is closed beyond early growth stages by helicolateral deposits; U/D is invariably less than 5 per cent. Typically, helicolateral deposits also occur on the ventrolateral flanks and, because of their pesence, succeeding whorls are indented on the dorslateral flanks. Shell ornament includes fine growth lamellae that form shallow ventral and lateral sinuses and corresponding shallow dorsolateral salients. During early growth stages, one or two constrictions occur on each volution and these parallel with growth lamellae.
 Prongs of the venral lobe are narrowly rounded, non-attenuate and have moderately straight sides. The secondary ventral saddle is slightly wider than the ventral prongs and is about half the height of the first lateral saddle. The first lateral saddle is broad and moderately symmetrical. The first lateral lobe is broad and is only slightly attenuated. The umbilical lobe is either on the umbilical shoulder or just outside the umbilicus].

Fig. see TAX5722A (suture).