Romaleon antennarium

Cancer antennarius Stimpson, 1856[1] Romaleon antennarium (formerly Cancer antennarius), commonly known as the Pacific, brown or California rock crab, is a crab of the genus Romaleon found on the western coast of North America.

Romaleon antennarium has a fan-shaped carapace with eleven teeth to either side of the eyestalks, the widest point falling at the eighth or ninth tooth.

This species is easily confused with the red rock crab, Cancer productus.

They can be distinguished by the less prominent antennae, less robust claws, and lack of ventral spots on the latter.

Romaleon antennarium is harvested by sport and commercial fishermen in California, mostly from Morro Bay south.