Abra prismatica is a species of bivalve mollusc in the family Semelidae.

Each shell valve is fine and brittle, about twice as long as it is wide and oval or fusiform.

It is sculptured with fine concentric lines, the chondrophore (pit to which the internal ligament is attached) points to the posterior.

It prefers fine, silty sand, but is also found in mud or gravel.

[3] It shares this type of habitat in the North Sea with the amphipod Bathyporeia elegans, various polychaete worms, the brittlestar Amphiura filiformis and the cumacean crustacean Eudorellopsis deformis.