Kermia catharia is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.
The length of the shell attains 4 mm, its diameter 1.5 mm.
The small delicate, white shell has an ovate-fusiform shape. It contains 8 whorls of which 2½ in the protoconch, with a pale straw color, globose and microscopically cancellate ribs. The subsequent whorls contains thick, rounded ribs, crossed everywhere by rough, spiral lirae; nine ribs and nine lirae in the body whorl. The aperture is narrow. The outer lip is slightly incrassate. The columella is oblique. The siphonal canal is recurved.[1]
This marine species occurs in the Gulf of Oman.