This fish can reach 25 centimetres (9.8 in) in length, but its common length is around 15 centimetres (5.9 in). The dorsal fin is divided into two parts, the anterior one having two long, curved spines and the posterior one thirty-two to thirty-six soft rays.[4] The first dorsal spine is located immediately above the middle of the eye and there is a deep groove in the fish's back into which the spine folds down.[5] The anal fin has no spines and twenty-nine to thirty-two soft rays. This species has three basic color types: a uniform dark brown, a mottled grayish-brown, and gray background color with a network of fine polygonal markings.[4] There is a prominent white spot at the base of the rear of the second dorsal fin and another at the base of the rear of the anal fins, a feature this species shares with the closely related C. pullus, found on tropical Atlantic reefs, and C. sandwichiensis from Hawaii.[5]
Distribution and habitat
This fish lives in tropical marine waters around reefs. It generally occurs at depths of up to 20 m (66 ft), sometimes venturing deeper. It is a shy and retiring fish, usually living solitarily and feeding on benthic organisms. Both juveniles and adults sometimes drift with plants and algae, including rafts of Sargassum.[4]
