AppearanceDorsal spines (total): 7; Dorsal soft rays (total): 9; Anal spines: 2; Anal soft rays: 8; Vertebrae: 24. This species is distinguished by having D VI-I,9; A II,8; pectoral rays 13; lateral line scales 24; predorsal scales 5; gill rakers 7 or 8+20 or 21, excluding an indistinct rudiment on upper limb; preopercular margin serrate; preopercular ridge smooth; body depth 3.4-3.7 in SL; semi-transparent in life with golden-brown midlateral strip, bordered below by narrow silver stripe; tip of lower jaw blackish. Max Size: 7 cm
NamingName from Latin 'nanus' meaning dwarf, referring to its size being one of the smallest in the genus.
DistributionWestern Central Pacific: Madang, Papua New Guinea; Maumere, Indonesia; and, near Kota Kinabalu, Sabah, Malaysia.
HabitatMarine; reef-associated; depth range 3 - 20 m. Occurs in silty inshore reefs; aggregations observed hovering during the day around both soft and hard coral formations.
ReproductionMouthbrooders. Distinct pairing during courtship and spawning.
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