Trianguloscalpellum diota ( Hoek, 1907 )

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 : 9-13

Trianguloscalpellum diota ( Hoek, 1907)

Figures 1 E, 7, 8

Scalpellum diota Hoek, 1907: 87 , pl. 7 figs 15, 15a. — Stubbings, 1936: 22, fig. 9. Trianguloscalpellum diota . — Zevina, 1981: 315, fig. 239.

Material examined. NMNS 003636-00002, 1 specimen, benthic trawl at Donggang, S. Taiwan (26 Apr. 2001, depth: 250 m), on spine of sea urchin Stylocidaris renei , CL 5.01 mm, CW 2.92 mm, PL 2.5 mm.

Diagnosis. Capitulum with 14 fully calcified plates, occludent margin nearly straight, carina margin strongly convex, surfaces with diffused pink patches (colour not faded out after preservation in ethanol); apex of carinolatus strongly recurved, umbo apical.

Description. Capitulum elongated, diffused light pink color (color not faded out after preservation in ethanol), with 14 capitular plates, covered by setose membrane ( Fig. 1 E); tergum quadrangular, occludent margin straight, umbo apical, apex acute ( Fig. 1 E); scutum quadrangular, occludent margin straight, umbo apical, apex slightly overlapping tergum ( Fig. 1 E); upper latus triangular ( Fig. 1 E); carinal margin strongly convex, umbo apical ( Fig. 1 E); inframedian latus small, triangular, umbo apical; rostrolatus quadrilateral, flattened, wider than high ( Fig. 1 E); carinolatus triangular, apex strongly recurved, umbo apical ( Fig. 1 E). Maxilla triangular, setae evenly distributed along cutting edge ( Fig. 7 A); cutting edge of maxillule not notched, with 10 or more cuspidate setae ( Fig. 7 B); mandible with 3, equally spaced teeth ( Fig. 7 C), first separated from second and third, cuspidate setae on lower margin, inferior angle with large, cuspidate setae ( Fig. 7 E); mandibular palp narrow, elongated, serrulate setae on superior margin and distally ( Fig. 7 D), inferior margin naked; labrum slightly concave, small denticles in straight row ( Fig. 7 F). Cirrus I short, separated from cirri II–VI, rami subequal ( Fig. 8 A), outer ramus longer (8-segmented), inner ramus flattened (6-segmented); cirri II–VI long, slender, similar in length ( Fig. 8 B, C); cirrus II with outer ramus 12- segmented; inner ramus 13-segmented; cirrus VI with outer ramus 15-segmented, inner ramus 17-segmented; caudal appendages short, length ~ 1/3 inner ramus of cirrus VI, 10-segmented, setae distally ( Fig. 8 C). Distribution. Indonesia, the Philippines and 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 7. Trianguloscalpellum diota. A. Maxilla, B. Maxillule, C. Mandible, D. Mandibular palp, E. Lower margin of mandible, F. Labrum, insert showing the cutting edge. Scale bars in µm.

FIGURE 8. Trianguloscalpellum diota. Line drawings of A. Cirrus I, B. Cirrus II, C. Cirrus VI, showing the caudal appendage. Scale bars in mm.