Rock Crab – Romaleon Antennarium by John Shelton | Dec 5, 2014 | Crustaceans, DPFishCo, Species ID | 0 comments Rock Crab – R. antennarium. Also known as the Pacific rock crab, Brown rock crab, and California rock crab Rock crab – top and bottom views. Identifying Characteristics and Biology Range and Habitat Market Forms Submit a Comment Cancel replyYou must be logged in to post a comment.