2011. Girtyoceras primum: Korn & Titus, p. 144, text-figs 26, 27.

Holotype. UMNH IP 2865, figured by Korn & Titus, 2011, text-fig. 26C.

Max. shell dm = 77 mm

Type locality, South Burbank Hills, bed 6, sample 01UTMI-3; Camp Canyon Member of Chainman

Formation, Girtyoceras primum Biozone.