Commonly called "red crabs" because of their orange to red color. Also have been referred to as "tuna crabs." There are 5 zoeal stages characterized by large eyes, a long serrated rostrum, and elongate postero-lateral carapace spines. It is not a true crab.
Normal geographical range is off Baja California. During warming events, especially stronger El Nińo’s, they can be abundant off Southern California to Central California. They occur in vast pelagic swarms and can be found washed up on local beaches in large numbers.
Boyd, C.M. (1960) The larval stages of Pleuroncodes planipes Stimpson (Crustacea, Decapoda, Galatheidae). Biological Bulletin 118: 17-30.