Seanet Mid Intertidal

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Romaleon antennarius Stimpson, 1856
Phylum Arthropoda, Subph. Crustacea, Class Malacostraca, Subcl. Eumalacostraca, Superorder Eucarida, Order Decapoda, Infraorder Brachyura, Family Cancridae

Adults 15-18 cm across reddish-brown carapace; claws tipped with black; underside of body with red spots; juvenile carapace usually covered with hairs. 

Common, but cryptic under rocks and algae; low intertidal zone & subtidal, protected outer coast. Preys on hard-shelled prey (snails, clams, etc).

Geo Range: British Columbia to Cabo San Lucas, Baja
Synonyms: Cancer anternnarius
Similar species: Cancer productus is also reddish with black-tipped claws, but it lacks red spots on ventral side & the teeth on its carapace are broader & rounder; its juveniles often have a striking zebra-stripe color pattern that is lacking in C. antennarius.