description Pacific Rock Crab Overview
The Pacific Rock Crab, scientifically known as *Romaleon antennarius*, is a marine crustacean native to the western coast of North America, ranging from British Columbia to Baja California. It is recognizable by its broad, oval shell and distinctive purple-spotted claws, which are notably large and strong for crushing prey. This species primarily inhabits rocky sea floors, intertidal zones, and kelp beds where it can find shelter. It is often targeted by recreational fishermen and occasionally harvested commercially for its meaty claws.
help Pacific Rock Crab FAQ
How do you identify Romaleon antennarius in the field?
The Pacific Rock Crab usually has a purplish-brown carapace, red or rust-colored spots on its underside, and black-tipped claws. Its legs and body can also look noticeably hairier than those of similar crabs.
Where does the Pacific Rock Crab live?
Its range extends from British Columbia to Mexico along the western coast of North America. It occurs from the intertidal zone down to about 91 meters, although it is usually found shallower than 45 meters.
Is the Pacific Rock Crab the same as a Red Rock Crab?
No. Pacific Rock Crabs are typically brown or purple with spotted undersides and hairier legs, while Red Rock Crabs are more often a deep brick red and have different body markings.
Why do some field guides call it Cancer antennarius?
Cancer antennarius is an older scientific name for the species. Modern guides may place it in the genus Romaleon and call it Romaleon antennarius, Pacific Rock Crab, Brown Rock Crab, or California Rock Crab.
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