The purple shore crab (Hemigrapsus nudus) is a common crab of the family Varunidae. It can be found sheltering under rocks in inter-tidal areas along the west coast of North America, from Alaska to Baja California in Mexico. This crab primarily eats sea lettuce and other green algae, and occasionally scavenges dead animals.

Hemigrapsus nudus. Retrieved January, 01 2022, from en.wikipedia.org/wiki/Purple_shore_crab.