Plectranthias ahiahiata

distribution

Distribution: known only from the type locality, off Easter Island ..

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

materials_examined

Holotype: CAS 244172, 39.95 mm SL Type locality: Hanga Piko, Rapa Nui (Easter Island); 27 ° 9 ′ 12 ″ S, 109 ° 26 ′ 52 ″ W, depth 83 meters. Illustrations: Shepherd, Phelps, Pinheiro, Pérez-Matus, & Rocha, 2018, figs. 1 – 3. Counts: D: X, 18. A: III, 7. P: 18. C: 14 (7 + 7, branched). V: 26 (10 + 16). S: 3. GR: 17 (6 + 11). LL: 31. CP: 16.

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

description

Description. Proportional measurements and morphological counts of the holotype are given in Table 1. Dorsal rays X, 18; last soft ray branched to base and counted as one; first dorsal spine very short, 4.5 % SL; fourth dorsal spine longest, 15.6 % SL; dorsal-fin base length 51.4 % SL. Anal-fin rays III, 7; last soft ray branched to base and counted as one; anal-fin base 13.7 % SL; second anal spine longest at 19.0 % SL; anal-fin origin at vertical beneath fifth dorsal-fin ray; pectoral-fin rays 18; length 33.8 % SL; pelvic fin I, 5; pelvic-fin length 26.5 % SL; pelvic-spine length 16.5 % SL; caudal fin with three dorsal and two ventral procurrent rays, two dorsal and one ventral unbranched rays, 7 + 7 branched rays; tubular lateral-line scales 31; vertical scale rows 30; scales above LL to origin of dorsal fin 3; scales above LL to base of middle dorsal spine 2; scales above LL to origin of anal fin 12; diagonal rows of scales on cheek 4; scales on top of head extending anteriorly to vertical from posterior margin of orbit, where two rows of mid-dorsal scales continue anteriorly to posterior margin of iris; area on top of head between eyes scaleless; no scales on chin, maxilla, or

Plectranthiasahiahiata, a new species of perchlet from a mesophotic ecosystem at Rapa Nui (Easter Island) (Teleostei, Serranidae, Anthiadinae)

diagnosis

Diagnosis. Plectranthias ahiahiata differs from all of its congeners by the following combination of characters: dorsal rays X, 18; pectoral rays 18; longest dorsal spine the fourth; LL continuous and complete with 31 tubed scales; circumpeduncular scales 16; head length 43.3 % SL; first dorsal spine 4.5 % SL; third anal spine 13.7 % SL; gill rakers 6 + 11; and in coloration: overall orange-red in color, with predominantly yellow snout, dorsal, pelvic and anal fins, a brilliant red spot outlined in white on the caudal peduncle, and four white spots on each side, following the contour of the lateral line.

Plectranthiasahiahiata, a new species of perchlet from a mesophotic ecosystem at Rapa Nui (Easter Island) (Teleostei, Serranidae, Anthiadinae)