Shell outline oval, slightly narrowed anteriorly; anterior end raised, concave at early stage, all slopes convex at later stage. Sculpture of strong scabrous ribs, rib interspaces relatively narrow; foramen oval. Posterior portion of foot covered by shell, shell edge slightly enveloped by mantle folds. Propodial tentacles approximately 12 on ventral side, some branching up to 4 times so that 2 or 3 layers of tentacles project in anterior view. Maximum shell length 36 mm (Kilburn and Rippey, 1982).

Shell differing from that of M. salebrosa in having a less tapered anterior end, a greater number of radial ribs, a more elongate foramen; propodium differing in having the tentacles branched. Kilburn and Rippey (1982) were the first to recognize the occurrence of this species subsequent to the original description of Reeve. They noted that it differed anatomically from Amblychilepas scutellum but did not provide details. Fissurellidea genevievae Dautzenberg has not been noticed in subsequent literature, but the original figures are adequate to allocate it to Medusafissurella dubia, with which it was not originally compared.

East Africa to South Africa: Mogadiscio, Somalia, to Kelso, Natal, South Africa; Madagascar. Living in submerged rock crevices, intertidal fringe to a depth of several meters.