Macrocallista nimbosa, or the sunray venus clam, is a species of bivalve mollusc in the family Veneridae.
Adult size ranges from 65 mm. to 95 mm.
<div align=center> Extant specimen
</div align=center>
<div align=center> Fossil specimen from the Pleistocene
</div align=center>
Atlantic coast of North America, ranging from North Carolina to Texas.