Glyptelasma gigas ( Annandale, 1916 )

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 : 3

Glyptelasma gigas ( Annandale, 1916)

Figures 1 A, 3

Poecilasma gigas Annandale, 1916: 299 , pl. 4 fig. 4, pl. 5 figs 10–14, pl. 6 figs 7, 8. Megalasma (Glyptelasma) gigas . — Calman, 1919: 364. — Nilsson-Cantell, 1928: 20. — Zevina, 1982: 85, fig. 75. Glyptelasma gigas . — Broch, 1931: 32, fig. 12.

Material examined. NMNS 005087-00078, 8 specimens, Stn. CP132 (22°20.98’N, 120°6.73’E, 21 Nov. 2001, depth: 690–700 m), CL 7.67–15.41 mm, CW 4.46–9.28 mm, PL 3.72–9.79 mm.

Diagnosis. Largest known species of Glyptelasma ; peduncle long; carinal base laterally expanded; scutum with basal and occludent margins forming right angle.

Description. Capitulum large, 5 smooth, white, opaque plates, separated by narrow, chitinous inter-spaces ( Fig. 1 A); tergum quadrangular, all margins straight; scutum ovoid, occludent margin convex, basal and tergal margins straight, carinal margin strongly convex, basal and occludent margins forming right angle ( Fig. 1 A); carina bowed, basal laterally expanded ( Fig. 1 A). Peduncle long, yellow, surface concentrically wrinkled ( Fig. 1 A). Maxilla bilobed, setae in 2 main clusters ( Fig. 3 A); maxillule notched, 2 large, long, cuspidate setae above notch, short spines in notch, 10 cuspidate setae below notch, region below notch expanded outwards ( Fig. 3 B); mandible with 6 teeth excluding inferior angle, first tooth separated from remaining teeth, lower margin very short, smooth, inferior angle terminating in 1 sharp seta ( Fig. 3 C); mandibular palp narrow, elongated, setae on superior margin ( Fig. 3 D); labrum concave, without deep notch, cutting edge with dense, fine teeth ( Fig. 3 E, I). Cirrus I with rami subequal; outer ramus 10-segmented, inner ramus 8-segmented ( Fig. 3 F); cirrus II with outer ramus 14-segmented, inner ramus 15-segmented ( Fig. 3 G); caudal appendage short, 1-segmented, length <height of basal segment of pedicle of cirrus VI ( Fig. 3 H).

Distribution. Malaysia, South China Sea, Taiwan.

Remarks. This is a new record for Taiwanese waters.

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 3. Glyptelasma gigas. A. Maxilla, B. Maxillule, C. Mandible, D. Mandibular palp, E. Labrum, F. Cirrus I, G. Cirrus VI, H. Caudal appendage, I. Cutting edge of labrum. Scale bars in µm, except F, G in mm.