Apogonichthyoides opercularis (Macleay, 1878)
Pearlycheek cardinalfish
photo by Randall, J.E.

Family:  Apogonidae (Cardinalfishes), subfamily: Apogoninae
Max. size:  7 cm SL (male/unsexed)
Environment:  reef-associated; marine
Distribution:  Western Central Pacific: endemic to northern Australia.
Diagnosis:  Dorsal spines (total): 9-9; Dorsal soft rays (total): 10-11; Anal spines: 2-2; Anal soft rays: 9-9; Vertebrae: 24-24. This species is distinguished by the following characters: blackish-tipped first-dorsal fin; brownish bars on body absent, faint darker basicaudal mark in adults; a darkish mid-postocular mark just posterior of preopercular edge; 16 pectoral-fin rays without small darkish spot above axil; 10 soft dorsal-fin rays; 9 soft anal fin rays (Ref. 83499).
Biology:  Nocturnal species; occurs inshore (Ref. 7300).
IUCN Red List Status: Least Concern (LC); Date assessed: 05 February 2021 Ref. (130435)
Threat to humans:  harmless


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