pt.  1925  Aganides.-Schmidt: 531
      1929  Gattendorfia (Balvia) Lange: 60.
      1960  Kenseyoceras Selwood: 171.
      1960  Kenseyoceras (Mayneoceras) Selwood: 171.
pt.  1960  Imitoceras.-Vöhringer: 113, 116.
      1994  Balvia.-Korn: 22.
      1996  Balvia.-Becker:32: Balvia (Balvia), Balvia (Mayneoceras), Balvia (Kenseyoceras).
      2002  Effenbergia Korn & Klug: 195,
       -----   Balvia.-Korn & Klug: 196.
     2009  Balvia.- Kullmann in Furnish et all.:3.  

Type species: Gattendorfia globularis Schmidt, 1924, p.120 [OD]

A    Conch form: small, lenticular to subglobose, completely involute, with punctiforme umbilicus.
B    Growth lines fine, prorsiradiate, concave-convex, with well developed ventrolateral salient and hyponomic sinus.
D    Flanks with several weak constrictions, which usually swing forward at venter to form grooves bounding a median keel.
Apertural modifications may be present.

Balvia (Balvia): Inner whorls evolute.

Balvia (Kenseyoceras): Conch biform: early stage imitoceratid-like, without constrictions; later, after a single
constriction formation of a strong keel and ventral rostrum. Apertural modification terminated by constrictions. Umbilicus
punctiform throughout ontogeny.

Balvia (Mayneoceras): Regularly spaced constrictions pass into sulci bordering median keel; episodically developed parabolic
ears throughout ontogeny. Umbilicus punctiform throughout ontogeny.

[Differences of subgenera regarded herin of specific rather than generic significance.

Fig. see TAX607, TAX3005, 3005A (cross sections).