Abstract
A new species of aploactinid, Cocotropus keramaensis, is described based on a single specimen collected off the Kerama Islands, southern Japan. This new species is separable from other known congeners in the following combination of characters: XII, 10 dorsal fin rays; II, 7 anal fin rays; 13 pectoral fin rays; 26 vertebrae; 4 + 8 = 12 gill rakers; five distinct preopercular spines; upper jaw longer than the lachrymal; single papilla on the posterior portion of the maxilla; outer edge of the lower jaw with four distinct papillae; first sensory pore of the lower jaw on both sides fused; anterior tip of the isthmus reaching to the fifth sensory pore of the lower jaw; and anterior four dorsal spines anterior to the third neural spine.
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