2011. Metadimorphoceras richardsi; Korn & Titus, p. 156, text-figs. 36A–C, 37.

Holotype. UMNH IP 3290, figured by Korn & Titus, 2011, text-fig. 37B.

Type locality. Hamilton Canyon, bed 44; Camp Canyon Member of Chainman Formation, Goniatites eganensis Biozone.