Pachygrapsus crassipes, known as the striped shore crab or lined shore crab, is a small crab found on rocky and hard-mud shores of the west coast of North to Central America and in the western Pacific in Korea and Japan. In North America, its range spans from Vancouver Island to Mexico. Typically, this crab will have a brown/purple or black carapace with green stripes. This specimen approx 1.5 - 2 cm across. Had a hell of a time photographing this chap. About an hour of playing cat and mouse.