Shell entirely transparent and colorless, of moderately large size (up to 6 mm), with thin, brittle walls. Shell surface smooth. Spire somewhat elevated, with prominent and deep sutures. In specimens with an intact keel, the keel is very tall and nearly truncate along its leading edge. No pigmentation at keel base. Eyes type b, with extremely large lenses in adults. Operculum thin. Radula large (largest in the genus Atlanta) and triangular, with monocuspid lateral teeth. Due to the thinness of the shell, the eyes and buccal mass with the contained radula can be clearly seen through the transparent shell in well preserved or freshly collected specimens.
See the family Atlantidae for a discussion of the species groups.