[A121852] Tristichotrochus unicus (Dunker, 1860)

Tristichotrochus unicus, common name the “Dall’s Unicum Top”, is a species of sea snail, a marine gastropod mollusk, in the family Calliostomatidae within the superfamily Trochoidea, the top snails and their allies.

NOTE: = Calliostoma unicum (Dunker, 1860)