Vulcanolepas fijiensis, Chan & Ju & Kim, 2019

Chan, Benny K. K., Ju, Se-Jong & Kim, Se-Joo, 2019, A new species of hydrothermal vent stalked barnacle Vulcanolepas (Scalpelliforms: Eolepadidae) from the North Fiji Basin, Southwestern Pacific Ocean, Zootaxa 4563 (1), pp. 135-148 : 138-139

publication ID	https://doi.org/ 10.11646/zootaxa.4563.1.7
publication LSID	lsid:zoobank.org:pub:3BB9131A-4368-46F6-B8DC-CC899B98E59D
DOI	https://doi.org/10.5281/zenodo.5934801
persistent identifier	https://treatment.plazi.org/id/861B2AAF-B0FA-46A3-A056-0EF67FA0412C
taxon LSID	lsid:zoobank.org:act:861B2AAF-B0FA-46A3-A056-0EF67FA0412C
treatment provided by	Plazi
scientific name	Vulcanolepas fijiensis
status	sp. nov.

Treatment

Vulcanolepas fijiensis sp. nov.

( Figures 3–7 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7 )

Material examined. Holotype. NIBR-IV0000830370 . North Fiji Basin (16° 59' 3848” S, 173° 54' 9067” E; 05.12.2016; depth 1988 m); collected using ROV ( ROPOS, Canadian Scientific Submersible Facility); coll. W.- K. Lee.

Paratype. ASIZCR-000411, same data as holotype.

Diagnosis. Vulcanolepas with small sized peduncular scales, ~ 0.43 mm length, protruding 0.3 mm from peduncle. First tooth of mandible large, sharp. Anterior and posterior rami of cirrus I with length ratio of rami bearing antenniform segments to robust segments ~1:1.

Description (based on holotype, except capitulum and cirrus I include paratype for comparison). Hermaphrodite capitulum higher than wide; capitular height:width ratio 1.3:1 ( Figure 3 View FIGURE 3 ). Capitulum with eight approximate plates; inter-spaces occupied by thin, cuticular membrane ( Figure 3 View FIGURE 3 A–C). Carinal umbo apical, carina slightly bowed, surface with 16 horizontal growth lines; carinal height ~2/3 capitular height ( Figure 3D View FIGURE 3 ). Tergum quadrangular, single ridge extending from basal angle to apex (apex angle 86 o); surface with V-shaped growth lines; basal angle of tergum (60 o), slightly elevated from capitular-peduncular edge, ~1/4 total height of capitulum ( Figure 3 View FIGURE 3 ). Scutum quadrangular, umbo apical, basal angle 55 o, located at capitular-peduncular edge ( Figure 3 View FIGURE 3 ), surface with 12 growth ridges. Medial latus equilateral triangular; umbo apical, apical angle 32.6 o; surface with 20 straight horizontal growth lines. Rostrum triangular, with 14 horizontal growth lines ( Figure 3E View FIGURE 3 ). Paratype with similar capitular morphology to holotype ( Figure 6A View FIGURE 6 ). Inner surfaces of capitular plates white, smooth ( Figure 3F View FIGURE 3 ).

Peduncle: Peduncular-capitular ratio ~2:1 ( Figure 3A View FIGURE 3 ). Peduncle with 32 scales/whorl just below capitular region, 28 scales/whorl at mid region of peduncle; scale width 0.43 mm (averaged from 3 scales), scales projecting 0.5 mm (averaged from 3 scales) from peduncle; scales rounded, smaller at capitular region of peduncle, larger at basal region.

Cirri: All six pairs of cirri located close to each other. Cirrus I with anterior and posterior rami similar length (26 and 28 segments, respectively); proximal segments of both rami robust (cf Buckeridge et al. 2013), distal half of rami antenniform ( Figure 4A View FIGURE 4 ); anterior and posterior rami with length ratio of ramus bearing antenniform segments to robust segments ~1:1 ( Figure 4A View FIGURE 4 ). Paratype with ~1:1 length ratio of antenniform to robust segments along rami of cirrus I ( Figure 6B View FIGURE 6 ); setae long, serrulate on both rami ( Figure 5A, B View FIGURE 5 ). Cirrus II with both rami similar length (anterior 42, posterior 41 segments); last 10 proximal segments robust, segment height 1.5 times width ( Figure 4B View FIGURE 4 ); rami antenniform from half to distal region; length ratio of antenniform segments to robust segments ~1: 1 in both rami ( Figure 4B View FIGURE 4 ); antenniform segments of cirrus II with 3 pairs of long setae and 2 pairs of short setae ( Figure 4B View FIGURE 4 ).

Cirrus III with rami similar in length (both 54 segmented); setae serrulate, with very short, sparse setules ( Figure 4C View FIGURE 4 ).

Cirri IV–VI similar in morphology, both rami similar in length; shape of segments similar through whole length of rami ( Figure 4 View FIGURE 4 D–F); intermediate segments of cirri IV–VI bearing 7 pairs of long setae ( Figure 4 View FIGURE 4 D–F).

Penis without basi-dorsal point, ~½ length of cirrus VI ( Figures 4G View FIGURE 4 , 6C View FIGURE 6 ).

Caudal appendages unsegmented, minute ( Figures 4H View FIGURE 4 , 6C View FIGURE 6 ).

Trophi: Maxilla subtriangular, exterior margin with simple setae ( Figure 5E, F View FIGURE 5 ). Maxillule cutting edge slightly curved, with dense, simple setae on cutting margin; interior margin slightly convex ( Figure 5G, H View FIGURE 5 ). Mandible tridentoid ( Figure 7A View FIGURE 7 ); first tooth large, robust, sharp, separated from lower teeth ( Figure 7B View FIGURE 7 ); second and third teeth comb-shaped, ~12 sharp spines on cutting edges ( Figure 7C, D View FIGURE 7 ), cutting edges of second and third teeth short, ~1/5 total length of mandible; inferior angle blunt, with dense, sharp spines ( Figure 7E View FIGURE 7 ); lower margin with simple setae ( Figure 7F View FIGURE 7 ). Mandibular palp subtriangular, tip and outer margin with simple setae ( Figure 7G View FIGURE 7 ). Labrum non bullate, with small, concaved notch; single array of small, sharp teeth at notch ( Figure 7H View FIGURE 7 ).