Inhabit coral reef . Form small aggregations . Distinguished from A. cyanosoma by the presence of a single red spot at the midbase of the caudal fin, a higher number of gill rakers, and apparently a smaller maximum size .
Dorsal spines (total): 8; Dorsal soft rays (total): 9; Anal spines: 2; Anal soft rays: 8; Vertebrae: 24. Predorsal scales 4; preopercular edge serrate; preopercular ridge smooth to slightly crenulate; body depth 2.85-3.05 in SL; silvery blue-gray with 6 orange to orange-yellow stripes on head and body, those on body narrower than blue-gray interspaces; third orange-yellow stripe from dorsal edge of eye ending below space between dorsal fins; midlateral orange-yellow stripe ending in a red spot at base of caudal fin .: elongated; Cross section: oval.
Behavioural data for Rubyspot cardinalfish is currently being reviewed.
Diet information for Rubyspot cardinalfish is currently being compiled.
Mouthbrooders . Distinct pairing during courtship and spawning .
Marine; reef-associated; depth range 0 - 33 m . Tropical; 22°N - 28°S, 120°E - 178°E Central Pacific: Ryukyu Islands south to Australia; Indonesia (Ref.
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