Home > Invertebrates > Crabs > Percnon affine
Updated 3/25/2013
Family Grapsidae
HAWAII
Percnon affine
Female, Sharks Cove, Oahu, 30 feet
Male, Sharks Cove, Oahu, 30 feet
Male, Lana'i Lookout, Oahu, 15 feet
BLUE-EYED ROCK CRAB
Occasional in holes and caverns in shallow water exposed to wave action. Eyes are bright blue, upper surface of male claws dark brown. Carapace width attains 3 inches. Hawaii & the Indo-Pacific.