The first new species of tardigrade in the family Echiniscoididae from the west coast of America is presented with an integrative description. Echiniscoides rugostellatus n. sp. was found on barnacles from a piling, in the Straits of Juan Fuca, Puget Sound, Port Townsend, Washington, USA. The new species is named after its granulated dorsal cuticle and the star-shaped tip of its internal and external cirri. The new species is separated from all other Echiniscoides by its granulated cuticle with flat patches, the number of claws on the legs of the adult and the structure of the buccal cirri.