Plectranthias hinano

materials_examined

Holotype: CAS 247195, field code HTP 909, GenBank MN 922329, 49.6 mm SL. Type locality: Tahiti, French Polynesia, 17 ° 29 ′ 27 ″ S, 149 ° 28 ′ 01 ″ W, depth 98 meters. Illustrations: Shepherd, Phelps, Pinheiro, Rocha, & Rocha, 2020, figs. 4 & 5 A. Counts: D: X, 15. A: III, 7. P: 11 or 12. C: 17 (9 + 8). V: 26 (10 + 16). S: 3. GR: 19 to 21 (7 or 8 + 12 or 13). LL: 29 or 30. CP: 12.

Additions and emendations to the annotated checklist of anthiadine fishes (Percoidei: Serranidae)

description

Description. Proportional measurements for the type specimens are presented in Table 1. Dorsal-fin rays X, 15; last soft ray branched to base and counted as one; first dorsal spine very short, 17.6 in SL (9.4); fourth dorsal spine longest, 5.5 in SL (third dorsal spine longest, 6.4 in SL); dorsal-fin base length 2.1 in SL (1.9); anal-fin rays III, 7; last soft ray branched to base and counted as one; anal-fin base 6.2 in SL (5.3); second anal spine longest and stoutest at 2.0 in HL (2.1); anal-fin origin at vertical beneath fourth dorsal-fin ray; pectoral-fin rays 11 (12), all unbranched, length 2.8 in SL (2.6); pelvic fin I, 5; pelvic-fin length 4.6 in SL (4.0); pelvic-spine length 2.4 in HL (2.3); caudal-fin procurrent rays 6 + 5; caudal-fin principal rays 9 + 8. Body moderately elongate, laterally compressed; depth of body 2.9 in SL (3.0); width of body 2.1 in depth (2.4); head length 2.4 in SL (2.5); snout length 3.0 in HL (3.2); bony interorbital width 3.5 in snout length (2.3); orbit diameter 3.7 in HL (3.5); post-orbital head length 5.4 in SL (5.6); least depth of caudal-peduncle 3.7 in HL (3.4); caudal-peduncle length 4.0 in SL (4.1). Scales ctenoid; lateral line complete a

Two new species of Plectranthias (Teleostei, Serranidae, Anthiadinae) from mesophotic coral ecosystems in the tropical Central Pacific

diagnosis

Diagnosis. Plectranthias hinano sp. nov. can be distinguished from all of its congeners by the following combination of characters: dorsal-fin rays X, 15, the last branched to base and counted as one; pectoral fin rays 11 or 12; vertebrae 10 + 16; lateral line complete with 29 - 30 tubed scales; gill rakers 7 - 8 + 12 - 13; ventral margin of preopercle with three antrorse spines; snout moderately long, 3.0 - 3.2 in HL, 12.3 - 14.2 % SL, overall red coloration with two indistinct black spots along the base of dorsal fin, translucent yellow dorsal and anal-fin membranes.

Two new species of Plectranthias (Teleostei, Serranidae, Anthiadinae) from mesophotic coral ecosystems in the tropical Central Pacific

distribution

Distribution and habitat. The two specimens described in this paper, plus an individual that was retained for public aquarium exhibition, were collected respectively in Tahiti and Moorea, French Polynesia. A similar species was photographed at 120 m depth in Erikub Atoll, Republic of Marshall Islands, however specimens were not retained (Fig. 5 B). The Marshall Islands specimens lack the black markings along the dorsal-fin base, and thus more closely resemble Plectranthias bennetti (Fig. 5 C), indicating that the latter may have a wider Pacific distribution and not just be restricted to the Coral Sea. All known individuals of P. hinano sp. nov. have been observed or collected in highly complex habitats on walls and ledges within MCEs (Fig. 3), suggesting that the species does not inhabit shallow coral reefs.

Two new species of Plectranthias (Teleostei, Serranidae, Anthiadinae) from mesophotic coral ecosystems in the tropical Central Pacific