Plectranthias polygonius

distribution

Distribution: Tahiti, French Polynesia, and Maloelap Atoll, Republic of the Marshall Islands.

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

materials_examined

Holotype: CAS 247193, field code HTP 906, GenBank MN 922331, 29.5 mm SL. Type locality: Tahiti, French Polynesia, 17 ° 29 ′ 27 ″ S, 149 ° 28 ′ 01 ″ W, depth 105 meters. Illustrations: Shepherd, Phelps, Pinheiro, Rocha, & Rocha, 2020, figs. 1 & 2 A. Counts: D: X, 16. A: III, 7. P: 14. C: 17 (9 + 8). V: 26 (10 + 16). S: 3. GR: 18 or 19 (5 or 6 + 13). LL: 27 to 30. CP: 10 or 11.

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 rays X, 16, the last soft ray branched to base and counted as one; first dorsal spine short, 18.0 in SL (15.8); third dorsal spine longest, 1.7 in HL (1.6) with flag-like extension; 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 length 6.3 in SL (6.5); second anal spine longest and stoutest at 1.6 in HL; anal-fin origin at vertical beneath fourth dorsal-fin ray; pectoral-fin rays 14, all unbranched, length 3.8 in SL (3.4); pelvic fin I, 5; pelvic-fin length 4.6 in SL (4.2); pelvic-spine length 2.0 in HL; procurrent caudal-fin rays 7 + 6 (6 + 5); principal caudal-fin rays 9 + 8. Body moderately elongate, laterally compressed; depth of body 3.4 in SL (3.2); width of body 2.7 in depth (2.3); head length 3.2 in SL (3.1); snout length 3.4 in HL (3.6); bony interorbital width 1.6 in snout length (1.3); orbit diameter 2.8 in HL; post-orbital head length 4.8 in SL (4.7); least depth of caudal-peduncle 2.5 in HL; caudal peduncle length 3.6 in HL (4.0). Scales ctenoid; lateral line complete and broadly arched over pecto

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

diagnosis

Diagnosis. Plectranthias polygonius sp. nov. can be distinguished from all of its congeners by live coloration, in particular the two rows of orange rhomboid-shaped polygons on the lateral part of the body and an elongated yellow and white third dorsal spine (Fig. 1 A, D), and by the following combination of characters: dorsal-fin rays X, 16; pectoral-fin rays 14, all unbranched; vertebrae 10 + 16; continuous lateral line with 27 - 30 tubed scales; circumpeduncular scales 10 or 11; absence of antrorse spines on the preopercle.

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