Spirotropis studeriana
Spirotropis studeriana is a species of sea snail, a marine gastropod mollusk in the family Drilliidae. Description. The shell of this species grows to a length between 11 mm and 22 mm. The shell is stouter than "Spirotropis patagonica", with a shorter body whorl. The ribs are stronger and fewer, evanescent on the body whorl. The revolving lines are slighter and scarcely apparent. The siphonal canal is shorter and broader. Distribution. This species occurs in the benthic zone of the cold waters off Argentina and the Kerguelen Islands at depths between 646 m and 845 m. Spirotropis studeriana