Maxus can grow up, and the maximum body length of the Maxus is 21.6cm. Generally live in coastal coral reef areas, mainly in the tropical eastern central Pacific waters. Marquesas are algae-eating fish and like to eat seaweed.

The Marquesas are generally oval in shape, with orange spots behind the eyes and dark horizontal bands on the back.The head is small and the outline of the back of the head is not special. bulge. The mouth is small, end position, with a row of flat teeth in the upper and lower jaws, the teeth are fixed and immovable, and the tooth margins are notched. The spines of the dorsal and anal fins are sharp, and the rays are not elongated. Pectoral fins nearly triangular. The caudal fin is crescent-shaped, and the upper and lower lobes gradually lengthen as they grow. The Marquesas is brown, with a dark blue band behind the operculum extending to the pectoral fins, and an orange spot just behind the eye. The base of the dorsal and anal fins each has a dark orange band, the soft rays of the dorsal fin have 3 dark transverse bands, and the anal fin has a bright blue edge. The outer 1/3 of the pectoral fin is white, the caudal fin is pale yellow with a black band at the end.