A New Lionfish of the Genus Dendrochirus (Scorpaenidae: Pteroinae) from the Tuamotu Archipelago, South Pacific Ocean

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  • A new lionfish of the genus Dendochirus (Scorpaenidae: Pteroinae) from the Tuamotu Archipelago, South Pacific Ocean

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Dendrochirus tuamotuensis sp. nov. (Scorpaenidae: Pteroinae) is described on the basis of a single specimen collected off Makemo Atoll, Tuamotu Archipelago, South Pacific Ocean. The new species is uniquely characterized by having bilobed pectoral fins, those of its all congeners being rounded. The new species is similar to a Hawaiian endemic congener, Dendrochirus barberi (Steindachner, 1900), in having nine dorsal-fin soft rays, five anal-fin soft rays, relatively high counts (more than 18) of pectoral-fin rays, fewer than two tentacles on the snout tip, and no large, ocellated spot on the soft-rayed portion of the dorsal fin. However, the new species is clearly distinguished from D. barberi by having more pectoral-fin rays (19 in the former vs usually 18 in the latter), higher counts of spinous points on the suborbital ridge (14-16 vs 1-9) and pterotic spine (8 vs 1-5), a slightly shallower, narrower body [body depth and width 35.4% of SL and 18.6% of SL, respectively, vs 34.0-43.9 (mean 39.2)% of SL and 19.7-26.4 (22.7)% of SL], a slightly shorter, narrower head [head length and width, 37.6% of SL and 12.9% of SL, respectively, vs 40.3-45.7 (42.9)% of SL and 13.8-17.2 (15.4)% of SL], slightly smaller orbit diameter [12.9% of SL vs 13.1-16.0 (14.2)% of SL], and a slightly shorter postorbital length [15.3% of SL vs 16.4-20.6 (18.5)% of SL].

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