Shell markedly narrowed anteriorly; anterior end raised; anterior shell edge thinner and sharper than elsewhere; posterior end only slightly or not at all raised; anterior slope concave. Foramen oval, interior callus not truncated posteriorly. Sculpture of strong, scabrous ribs. Posterior portion of foot covered by shell; shell edge only slightly enveloped by mantle folds; propodium with radiating tentacles, sometimes branched, subequal in length. Large outer lateral tooth of radula quadricuspid.

On the basis of shell characters alone, the species grouped here have been variously assigned to other fissurellid genera. The shell of Medusafissurella differs from that of most Fissurella species in having a prominently raised anterior end with thin edge, and from Amblychilepas and Dendrofissurella in having strong, scabrous primary ribs, and a less raised posterior end. Body differing in being nearly covered by the shell and in having numerous propodial tentacles, not the single main, branching structure of Dendrofissurella. The quadricuspid outer lateral tooth of Medusafissurella is similar to that in Dendrofissurella, Amblychilepas, and Fissurella.