Smallest mature female measured at 6.3 cm. Solitary in caves and under ledges, inhabits seaward reef slopes in 10-40 m (Ref 90102).
Dorsal spines (total): 7; Dorsal soft rays (total): 9 - 10; Anal spines: 2; Anal soft rays: 8 - 9. Color in life pale with 8 golden brown stripes. Stripes below middle of body equal to or slightly wider than interspaces. Stripes above middle of body slightly narrower than interspaces. Distal half of first dorsal fin black and proximal half pale. Second dorsal, anal, pectoral, and pelvic fins with reddish tinge. Leading edge of second dorsal and anal fins dusky to dark brown, usually darker distally. Upper- and lowermost caudal-fin rays dark brown. No dark caudal spot (Ref 8525).: elongated; Cross section: compressed.
Behavioural data for Allen's cardinalfish is currently being reviewed.
Mouthbrooders . Distinct pairing during courtship and spawning .
Marine; reef-associated; depth range 10 - 40 m . Tropical Central Pacific: Papua New Guinea, Flores in Indonesia, and Sibvan Island in Borneo.
The following diseases are known to affect Allen's cardinalfish.
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