Scleroplax granulata is a species of crab in the monotypic genus Scleroplax. It was first described by Mary J. Rathbun in a paper dated 1893 but only published in 1894.Scleroplax lives as a commensal of various burrowing animals including the mud shrimp Neotrypaea californiensis, N. gigas, Upogebia pugettensis and U.