The Puerto Rican sand crab, Emerita portoricensis, is a species of "sand crab" belonging to the genus Emerita, which is native to the main island of Puerto Rico and its archipelago.

[1] This investigation determined that the species has diotic traits and that there are size and survival differences between sexes.

[3] Puerto Rican sand crabs, along with Hippa cubensis, Emerita brasiliensis, and Lepidora richmondi inhabit the sandy beaches of Golfo Triste in Venezuela.

As filter feeders, they use their antennae to catch detritus and plankton caught in the waves.

In one study, mercury levels in E. portoricensis tended to be higher when compared to the sediment samples around it.