Shells of Rugulina are fragile depressed with wide open umbilicus, and spiral cordlets. Aperture is strongly prosocline, sharp, elongated.
Six species are currently known in the genus; three from the Antarctic and three
from the northern hemisphere: Rugulina monterosatoi (van Aartsen & Bogi, 1987) from the Mediterranean Sea, R. fragilis (G.O. Sars, 1878) from the northeastern Atlantic and R. verrilli (Tryon, 1888) from the northwestern Atlantic.