Cargo Pier, Midway Atoll, 30 feet

Yawatano, Izu, Japan, 30 feet

Uncommon and well-hidden among sandy rubble and seaweed at any depth except in Japan where it is common.  Gray or dull brown with dark scale margins and obscure blotches, iridescent bright blue spots that may be displayed at will, prominent spines, and a nearly flat belly.  Attains 3.5 inches.  Hawai‘i and the Indo-Pacific.