About Romaleon antennarium (Stimpson, 1856)
Romaleon antennarium (Stimpson, 1856) has a fan-shaped carapace, with eleven teeth located on each side of the eyestalks. The widest point of the carapace falls at the eighth or ninth tooth. Its chelipeds are quite stout, with black tips that are bent downward. The species gets its specific name from its long, prominent antennae. The dorsal surfaces of adult individuals are uniformly red, while the ventral surface of the carapace has spots. This species is easily confused with the red rock crab, Cancer productus. The two can be distinguished because Cancer productus has less prominent antennae, less robust claws, and lacks ventral spots.
