Adults are found on seaward and lagoon reefs, usually less than 5 m . 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 . Minimum depth from Ref. 58018.
Dorsal spines (total): 14 - 17; Dorsal soft rays (total): 7 - 10; Anal spines: 1; Anal soft rays: 16 - 19. Male red with darker red, double red bars , black "mask" covering front and lower two-thirds of head, chest, and pectoral-fin base, narrow white bar at caudal-fin base, and basal two-thirds to three-fourths of caudal-fin black. Female translucent greenish grey with indistinct reddish blotches along back, middle of sides, and just above anal-fin base. Head, chest, and pectoral-fin base scaleless; short orbital tentacle present; mandibular pores 3-4 + 1 + 3-4. Maximum size to 3.5 cm TL .: elongated; Cross section: oval.
Behavioural data for Blacktail triplefin is currently being reviewed.
Marine; demersal; depth range 0 - 11 m . Tropical Central Pacific: Taiwan, Philippines, Vanuatu, Tonga, American Samoa, Society Islands, Kiribati, Jarvis Island, Howland Island, Wake Island, Marshall Islands, Micronesia, Guam, and Boni Islands (Japan).
Occurrence records from the Global Biodiversity Information Facility (GBIF) - 1 records indexed .
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