The juvenile shells are considerably more roundish in form than the adult ones, which are inclined to narrow in the anterior zone. Even the dorsal gibbosity is meant to reduce during the growth. Sculpture broad, made by radial little ribs and by light concentric little lines. Apex hole stretched and trilobate with internal callum brownish in colour. The ground colour pattern is rather variable: from dark brown, violet, to greenish (in the literature there are known the taxa: cinnabrina, viridis, lilacina, rosea etc.). Some radial streaks are always present. Dirty white in colour.

A really different external sculpture and a different form of the callosity around the central hole, seen from the internal zone, make easier the identification of this species from the other Mediterranean ones assigned to Diodora genus.

Common enough all over the Mediterranean coasts. It lives firmly fixed, through its solid foot, to the rocks of the mesolittoral, even in the zones exposed to the waves.