1942  Pennoceras Miller & Unklesbay, p.146.
     1957  Pennoceras.- Treatise, p.L60.
     1960  Pennoceras.- Ruzhentsev, p.213.
     1962  Pennoceras.- Osnovy, p.377.
     1997  Pennoceras.- Mapes et al.: 218.
     2006  Pennoceras.- Work, Boardman & Mapes: 591.

A:   Conch subglobular, umbilicus closed.
B:   Sculpture consisting of prominent straight ribs.
G:   Suture-line in general primitive, with rounded elements. Median saddle low, not reaching half the height of entire
       ventral lobe.

[Relationship uncertain, assignment ot Wiedeyoceratidae tentative].

Fig. see. TAX5528 D.

[Mapes et al., 1997, p.218: Conch globose and involute; ornament of coarse transverse lirae. Suture goniatitic; prongs
of ventral lobe shallow and U shaped, lateral saddle rounded, lateral lobe bluntly pointed, slightly inflatee, and V shaped.]