Corbicula fluminalis is a species of freshwater clam, an aquatic bivalve mollusk in the family Cyrenidae.

The scientific names themselves are also sometimes confused in the literature (e.g. by being called "Corbicula fluminata").

[2] This character is already clearly recognizable (albeit only by direct comparison) in very small (5 mm diameter) specimens.

In addition, when viewed from the side (looking at the opening between the shells), C. fluminalis is rounder, almost heart-shaped, while C. fluminea has a slightly flatter shape, like a teardrop with a notched broad end.

All these differences except the rib number are a consequence of C. fluminalis having a markedly more swollen, pointed and protruding umbo.