Adults are found in various reef habitats especially in reef flats and tidepools and in surf-swept reef margins. Also found in intertidal areas and is usually associated with coralline rock and coral reef lagoons . Eggs are hemispherical and covered with numerous sticky threads that anchor them in the algae on the nesting sites . Larvae are planktonic which occur primarily in shallow, nearshore waters .
Dorsal spines (total): 15 - 16; Dorsal soft rays (total): 9 - 10; Anal spines: 1; Anal soft rays: 17 - 19. Males have dark lower head and are abruptly dark posterior, occasionally with alternating broad dark and light bands . Adults are identified by the greenish tail and the color usually extends well onto the body . Mature males with two broad, black bands below third dorsal fin base and caudal peduncle, two bands joined ventrally; posterior half of anal fin black in mature males; caudal fin base white; pectoral and pelvic fins and body orange in mature males .: elongated.
Behavioural data for Halfblack Triplefin is currently being reviewed.
Marine; reef-associated; non-migratory; depth range 0 - 30 m . Tropical; 30°N - 15°S
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