1975  Trettinoceras Nassichuk: 136.

A: Conch form moderately involute, with relatively narrow umbilicus; early whorls triangularly coiled.
B: Ornamentation reticulate, consisting of longitudinal lirae and more pronounced sinuous growth lamellae.
C: Umbilical nodes conspicuous in immature stages, absent at maturity.
G: Height of median saddle exceeding slightly half the height of entire ventral lobe.

[One species from one locality. Relationship uncertain].

[Nassichuk, 1975, p.136: The conch of Trettinoceras is subdiscoidal and moderately evolute; typically the
umbilicus is slightly less than 30 per cent of the conch diameter at maturity. Early whorls are variously circular
or triangular. Shell ornament is reticulate and sinuous growth lamellae are relatively more pronounced
than longitudinal lirae. Umbilical nodes are prominent during early growth stages but are absent at full maturity].