Abstract
Naso minor was described from a single specimen (Smith, 1966). Only one other specimen has since been reported (Randall, 1986). The species apparently differed fromN. thynnoides in the ratio of fork length to head length and eye diameter, the shape of the caudal peduncle spine, and in number of dorsal spines. Collections of 24 specimens of four- and five-spined individuals (putatively assigned to both species) from the Philippines revealed that the first three differences are not valid. However, spine number, the length of the nasal groove, the pigmentation of the basal plate of the caudal peduncle spine, and the morphology of the first dorsal-fin pterygiophore confirm the distinctness of the two species.
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