Female, Hanauma Bay, O'ahu

Male, Hanauma Bay, O'ahu

Female, Night, Hanauma Bay, O'ahu, 3 feet

Female, Night, Hanauma Bay, O'ahu, 3 feet

Female, Hanauma Bay, O'ahu, 35 feet

Juvenile, Sharks Cove, O'ahu, 30 feet

Female, Night, Kapoho tidepool, Hawai'i

Female, Molokini Back Wall, 50 feet

Subadult, YO-257 Wreck, Waikiki, O'ahu, 70 feet

Male, Molokini, 50 feet

Female, Molokini, 30 feet

Juvenile, Hale'iwa Trench, O'ahu, 15 feet

Juvenile, Sharks Cove, O'ahu, 25 feet

Puako, Hawai'i, 15 feet

Common on shallow reefs where it feeds upon coralline algae, absent north of French Frigate Shoals in the Northwestern Hawaiian Islands.  Elongate with a blunt angular head, smooth exposed jaws, tail with greatly elongated margins, frequently displaying a bicolor pattern.  Females reddish or yellowish brown with dark scale edges, males turquoise or green with pastel hues, juveniles greenish-brown with white stripes, dots, and dark scale edges.  Attains 28 inches.  East Africa to the Tropical Eastern Pacific.