pars 1918  Pseudoclymenia.-Wedekind: 137.
pars 1959  Tornoceras (Protornoceras).-Petter: 201.
pars 1971  Polonoceras.-Bogoslovskii: 61.
pars 1992  Pernoceras.-Becker: 20.
pars 1993  Pernoceras: 221.
        1995  Planitornoceras Becker: 609.
        2002  Planitornoceras.-Korn & Kug: 164.

Type species: Planitornoceras pugnax Becker, 1995, p..611; OD.

A:   Shell extremely compressed, flanks always flat, venter tabulate to slightly carinate, umbilicus open,
      subinvolute to subevolute.
B:   Growth lines strongly biconvex with characteristic prominent and asymmetric ventrolateral salient
      which ascends prorsiradiately on the flanks and deflects into the deep ventral salient at the
      angular ventral edges. Internal mould with distinctive ventral band.
D:   No constrictions.
F:   No spiral grooves, but broad spiral depressions in some species.
G:   Ventral lobe and saddle small, shallow, widely rounded, asymmetric adventitious lobe, relatively
      short dorsolateral saddle.