Trianguloscalpellum regium ( Thomson, 1878 )

Chan, Benny K. K., Prabowo, Romanus Edy & Lee, Kwen-Shen, 2010, North West Pacific deep-sea barnacles (Cirripedia, Thoracica) collected by the TAIWAN expeditions, with descriptions of two new species, Zootaxa 2405, pp. 1-47 : 13-16

Trianguloscalpellum regium ( Thomson, 1878)

Figures 1 G, 10

Scalpellum regium Wyville Thomson, 1878: 11 , figs 2–3. — Hoek, 1883: 106: pl. 4 figs 3–5. — Pilsbry, 1907: 28, pl. 3 figs 4, 5. — Gruvel, 1920: 30, pl. 1 fig. 7.

Trianguloscalpellum regium regium . — Zevina, 1981: 309, fig. 234.

Material examined. CEL-BB-46C, 1 specimen, Stn. CP375 (24º16.240’N, 122º11.720’E, 27 Aug. 2006, depth: 2216–2497 m), CL 36.3 mm, CW 22.50 mm, PL 16.78 mm.

Diagnosis. Capitulum quadrangular, covered by smooth membrane, 14 fully calcified plates; tergum large, triangular, carinal margin convex, occludent margin straight, umbo apical; scutum quadrangular, higher than wide, apex produced at junction of occludent and tergal margins, umbo apical; carinolatus higher than wide, curved, apex produced, umbo apical.

Description. Capitulum quadrangular, 14 plates, covered by smooth membrane ( Fig. 1 G); tergum large, triangular, carinal margin convex, occludent margin straight, umbo apical; scutum quadrangular, higher than wide, apex produced at junction of occludent and tergal margins, umbo apical ( Fig. 1 G); upper latus triangular, tergal and lateral margins convex, scutal margin concave ( Fig. 1 G); inframedian latus equilateral triangle, umbo apical; rostrolatus very narrow, wider than high; carinolatus higher than wide, curved, apex produced, umbo apical ( Fig. 1 G); carina bowed, roof flat; peduncle with densely packed, concentric scales ( Fig. 1 G). Maxilla densely setose ( Fig. 10 A); cutting edge of maxillule not notched,>22 large cuspidate setae along cutting edge ( Fig. 10 B); mandible with 3 evenly separated teeth excluding inferior angle, lower margin long, naked, inferior angle covered by dense setae ( Fig. 10 C); mandibular palp narrow, elongated, setae along superior margin, inferior margin naked ( Fig. 10 D); labrum concave, cutting edge smooth, teeth absent ( Fig. 10 E). Cirrus I separated from remaining cirri, rami unequal, outer ramus longer, slender, 10-segmented, inner ramus broader, shorter, 6-segmented ( Fig. 10 F); cirrus II with rami equal, both rami 22-segmented ( Fig. 10 G); cirrus VI with rami equal, outer and inner rami 33-segmented; caudal appendage short, 4-segmented, length <height of basal segment of pedicle of cirrus VI ( Fig. 10 H).

Distribution. Cosmopolitan: Atlantic and Pacific Oceans, including Taiwan.

Remarks. This is a new record for Taiwanese waters. This species was named by the chief scientist, Professor Sir Charles Wyville Thomson (see Hoek, 1883: 106), but no detailed species description was provided. Hoek (1883) fully described the species and retained Thomson’s name, Scalpellum regium .

Figures

FIGURE 1. Taiwanese deep-sea barnacles (right side view). A. Glyptelasma gigas, B. Euscalpellum rostratum, C. Arcoscalpellum truncatum, D. Tarasovium orientale, E. Trianguloscalpellum diota, F. Trianguloscalpellum hirsutum, G. Trianguloscalpellum regium, H. Trianguloscalpellum weltnerianum, I. Verum novazelandiae.

FIGURE 10. Trianguloscalpellum regium. A. Maxilla, B. Maxillule, C. Mandible, D. Mandibular palp, E. Labrum, F. Cirrus I, G. Cirrus II, H. Caudal appendage. Scale bars in µm, except F, G in mm.