North West Pacific deep-sea barnacles (Cirripedia, Thoracica) collected by the TAIWAN expeditions, with descriptions of two new species Author Chan, Benny K. K. Author Prabowo, Romanus Edy Author Lee, Kwen-Shen text Zootaxa 2010 2405 1 47 journal article 10.5281/zenodo.194179 19ddd29f-a941-40dd-95aa-ecafcedba6da 1175-5326 194179 Arcoscalpellum truncatum ( Hoek, 1883 ) Figures 1 C, 5 Scalpellum truncatum Hoek, 1883 : 92 , pl. 6 fig. 13. — Zevina, 1973 : 846 . Arcoscalpellum truncatum . — Zevina, 1981 : 334 , fig. 254. Material examined. NMNS 005087-00073, 1 specimen , Stn. CP185 ( 22º0.54’N , 119º 27.94’E , 26 Aug. 2002 , depth: 2334–2543 m ), CL 12.94 mm , CW 7.39 mm , PL 4.06 mm ; CEL-BB-46D, 1 specimen , Stn. CP375 ( 24º16.240’N , 122º11.720’E , 27 Aug. 2006 , depth: 2216–2497 m ), CL 18.17 mm , CW 9.29 mm , PL 4.39 mm . Diagnosis. 14 fully calcified capitular plates, white, surfaces striated with radiating lines; tergum pentagonal, bluntly truncated; inframedian latus narrow, triangular, touching upper latus; carinolatus with umbo at basicarinal angle, located in middle of carinal margin; carina bowed, umbo apical. 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. FIGURE 4. Euscalpellum rostratum . A. Maxilla, B. Maxillule, C. Mandible, D. Mandibular palp, E. Caudal appendage, F. Cirrus I, G. Cirrus II. Scale bars in µm, except F, G in mm. Description. 14 fully calcified, white plates, surfaces with prominent ridges ( Fig. 1 C); tergum pentagonal, bluntly truncated, occludent and basal margins straight, carinal margin slightly convex ( Fig. 1 C); scutum with umbo apical, apex projecting over tergum, occludent and basal margins straight, tergal margin slightly concave, occludent and basal margins forming right angle ( Fig. 1 C); upper latus trapeziform, carinal margin short, straight ( Fig. 1 C); scutal margin long, concave, umbo apical, apex projecting over scutum ( Fig. 1 C); rostrolatus quadrangular, scutal and basal margins parallel, umbo at occludent margin of scutum ( Fig. 1 C); carinolatus irregular shape, subquadrangular, carinal margin concave, other margins straight, umbo at basicarinal angle, in middle portion of carinal margin, angle not extending beyond carina ( Fig. 1 C); rostrum narrow, small ( Fig. 1 C). Maxilla triangular, with setae on all margins, maxillary lobe long, naked ( Fig. 5 A); cutting edge of maxillule notched, 4 cuspidate setae above notch, notch naked,>7 cuspidate setae below notch ( Fig. 5 B); mandible tri-dentate, teeth sharply pointed ( Fig. 5 C), lower margin short, with sparse setae, inferior angle setose ( Fig. 5 C); mandibular palp elongated triangle, superior margin with sparse setae, denser distally ( Fig. 5 D); cirrus I with rami subequal ( Fig. 5 F), separated from cirri II–VI; outer ramus longer, slender (10- segmented), inner ramus flattened (8-segmented); cirrus II with outer ramus longer (19-segmented) than inner ramus (14-segmented; Fig. 5 H); cirri III–VI similar, rami long, slender, 28–30 segmented ( Fig. 5 E); caudal appendages short, slender, slightly longer than first segment of basal pedicle of cirrus VI, 7-segmented ( Fig. 5 G). Distribution. New Zealand , Australia and Taiwan . Remarks. This is a new record for Taiwanese waters.