Inhabits inshore reefs and tide pools. Hides in small recesses. Common, but rarely seen . Nocturnal species . Intertidal observations were also reported .
Dorsal spines (total): 11; Dorsal soft rays (total): 13; Anal spines: 4; Anal soft rays: 9. Upper profile angular. Mouth small, lower jaw fitting into upper. Lower opercular spine longer and stronger than upper. Axil of pectoral dark, jet black in small specimens, dusky brown in large . Head and nape clear bright red. Body with alternating streaks of red and white .: fusiform / normal.
Behavioural data for Dusky squirrelfish is currently being reviewed.
Diet information for Dusky squirrelfish is currently being compiled.
Reproduction data for Dusky squirrelfish is currently being compiled.
Marine; reef-associated; depth range 0 - 20 m . Tropical South America.
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