1951  Imitoceras.-Miller & Collinson: 462 (part), fig.2C, pl.68 fig.15, 16.
     1971  Karagandoceras.-Manger: 34, 35 (part), fig.2, 3C, pl.12 fig.1-3.
     1979  Karagandoceras.-Mason & Chaplin: 150, pl.3 fig.3, 4.
     1983  Karagandoceras.- Campbell, Brown & Coleman: 98, 99, fig.22, 23.
     1988  gen.nov. II aff. Karagandoceras Bartzsch & Weyer: 135, 136, fig.2.4, 2.5.
     1993  Gen. II aff. Karagandoceras Becker: 464, table 4.
     2002  Masonoceras Work & Manger: 574.

Type species: Masonoceras kentuckiense Work & Manger, 2002, p.575 [OD].

A:   Conch thinly subdiscoidal to discoidal with acute ventral margin in late ontogeny.
G:   Mature external suture comprises wide, trifid ventral lobe with high median saddle (hs/hl 0.6), and asymmetric ventral prongs deeper than medial division; narrow, asymmetrically rounded lateral saddle; exceptionally deep, asymmetric lateral lobe; small, rounded umbilical lobe.
Sutural formula: (V2 V1 V2) L U : I D.