1971  Isohomoceras Ruzhentsev & Bogoslovskaia: 19.
     1978  Isohomoceras.-Ruzhentsev & Bogoslovskaia: 188.
     1987  Isohomoceras.-Riley: 29.
     2001  Isohomoceras.-Titus & Manger: 20.

Type species: Glyphioceras inostranzewi Karpinskii, 1889, p.60 [OD].

A:   Conch form and suture-line like Homoceras. Early whorls evolute, but lacking sharp umbilical shoulder (no "calyx" stage).

[Ruzhentsev & Bogoslovskaia, 1971, p. 19]: Young shells range from spheroconic to pachyconic, with a rounded umbilical shoulder, adult shells oxyconic; calyx stage lacking. Whorls from completely to highly involute. Umbilicus narrow and stepped in final stage. Sculpture represented only by lamellae - simple, intercalatory or irregularly dichotomizing, forming a considerable ventral sinus in adult shells. Intraventral ridge absent. Ventral lobe not very wide (wl/hl~1, rarely greater), mainly with cuneiform branches; median saddle fairly high. In adult shells, lateral lobe as a rule considerably shorter than ventral lobe.

Adult shells of the genera Isohomoceras and Homoceras are probably indistinguishable. In the early stages the former is distinguished from the latter by lack of a calyx stage, by the rounded umbilical shoulder, and by the narrower umbilicus. These genera coexisted for a long time, are frequently found together, but may always be readily discriminated by the nature of the young shells.

[Ruzhentsev et Bogoslovskaya, 1978, p.188: Conch sphaericone to pachycone, with rounded umbilical rim in young specimens, oxycone in adults.  Calyx stage absent.  Whorls completely to very tight.  Umbilicus is tight and step - like in terminal stages.  Sculpture represented only by simple, intercalating or dichotome lamellae.  In adults they form a significant ventral sinus.  Intraventral keel absent.  Ventral lobe not very wide (predominent w/h approx. 1.00), chiefly with wedge-shaped prongs.  Mostly, side lobe significantly shorter than ventral lobe in adults.]