1999  Calygirtyoceras Korn, Klug & Mapes: 353.

Type species: Calygirtyoceras darkaouaense Korn, Klug & Mapes, 1999, p.354; OD.

Conch large, on early juveniles widely umbilicate with trapezoidal cross section, later barrel-shaped with sharp
umbilical margin, intermediate stage with rounded flanks and venter, and adult stage lenticular-oxyconic. No ventrolateral
grooves. Suture line with high median saddle, broadly rounded ventrolateral saddle, and V-shaped adventitious lobe.

Fig. see TAX6541 A (cross-section), B (suture).