Adults inhabit rock and coral reefs and may be found in tidepools at depths of 6 m and shallower . 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 - 17; Dorsal soft rays (total): 8 - 10; Anal spines: 1; Anal soft rays: 16 - 19. Translucent greyish with irregular dark bars/saddles on back and side. Male with large black spot covering pectoral-fin base and black "mask" covering most of head and breast. Female with oblique black bands on anal fin. Head, chest, and pectoral-fin base scaleless; short, lobate orbital tentacle; mandibular pores 3 + 1 + 3. Maximum size to 3.1 cm TL .: elongated; Cross section: oval.
Behavioural data for Onespot triplefin is currently being reviewed.
Diet information for Onespot triplefin is currently being compiled.
Reproduction data for Onespot triplefin is currently being compiled.
Marine; demersal; depth range 0 - 6 m . Subtropical
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