Thracia phaseolina is a bivalve mollusc in the family Thraciidae.

[1] The ovate shell is oblong, transverse, equilateral and inequivalve.

The valves are white, diaphanous and smooth, indistinctly marked with striae of increase, rounded at the anterior side, strongly truncated at the posterior side.

The side is bounded outwardly by an obtuse angle, pretty prominent, extending obliquely from the beak to the lower part of the shell.

It presents upon the posterior side the beaks with a small, internal, short, triangular hollow, in which is attached a small internal ligament which is apparent externally.