4 species (see text) Dilemma is a genus of marine bivalves of the family Poromyidae.

[1] The genus is remarkable for encompassing predators of isopods and ostracods, unusual for sessile molluscs.

[2] One species is known from the western Atlantic Ocean (Straits of Florida) and three from across the Pacific.

Specimens have been found at depths between 229–961 m (751–3,153 ft).

This bivalve-related article is a stub.