Metaverruca recta ( Aurivillius, 1898 )

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 : 36

Metaverruca recta ( Aurivillius, 1898)

Figures 2 G, 25, 26

Verruca recta Aurivillius, 1898: 195 .

Verruca sculpta Aurivillius, 1898: 197 .

Verruca halotheca Pilsbry, 1916: 188 , pl. 12 figs 9, 10.

Verruca cookei . — Rosell, 1989: 299, pl. 11 figs r, s, u, v (non Verruca cookei Pilsbry, 1927 ). — Rosell, 1991: 33 (non Verruca cookei Pilsbry, 1927 ).

Metaverruca recta . — Buckeridge, 1994: 116, figs 13a–f. — Young, 1998: 52.

Material examined. NMNS 20050614, 1 specimen, Stn. CP278 (24º23.63’N, 122º14.13’E, 14 Jun. 2005, depth: 1222–1239 m), BD 9.44 mm.

Diagnosis. External shell smooth, growth lines widely spaced; orifice D-shaped; movable tergum and scutum with 3 articular ribs; fixed scutum with myophore.

Description. Shell white, smooth, low conic, with operculum sub-parallel to base, growth lines widely spaced, orifice D-shaped; rostral and carinal apices marginal, movable tergum and scutum with 3 articular ribs ( Fig. 2 G). Maxilla bilobed, dense setae in 3 main clusters ( Fig. 25 A); maxillule notched, 2 large cuspidate setae above notch, 7 fine setae in notch, 7 large setae below notch on expanded margin ( Fig. 25 B); mandible with 3 teeth ( Fig. 25 C, G), lower margin with several small teeth or large pectinations, inferior angle terminating in several cuspidate setae ( Fig. 25 E); labrum cutting edge with sharp, fine teeth ( Fig. 25 F, H). Cirrus I with rami subequal, outer ramus 13-segmented, inner ramus 12-segmented ( Fig. 26 A); cirrus II with rami subequal, outer ramus 11-segmented, inner ramus 8-segmented ( Fig. 26 B); caudal appendage short, 7- segmented, length within basal length of basal segment of cirrus VI ( Fig. 26 C).

Distribution. Caledonia, the Philippines, Taiwan, Atlantic Ocean,

Remarks. Metaverruca recta is one of the largest verrucids. This is a new record for Taiwanese waters.

Figures

FIGURE 2. Taiwanese deep-sea barnacles (right side view on A – C, top view for D – I). A. Annandaleum japonicum biramosum, B. Litoscalpellum spinosus sp. nov., C. Scalpellum stearnsii, D. Altiverruca longimandible sp. nov., E. Altiverruca navicula, F. Metaverruca defayeae, G. Metaverruca recta, H. Rostratoverruca krugeri, I. Hexelasma velutinum.

FIGURE 25. Metaverruca recta. A. Maxilla, B. Maxillule, C. Mandible, D. Mandibular palp, E. Lower margin of mandible, F. Labrum, G. Second and third teeth of mandible, H. Cutting edge of mandible, showing fine teeth. Scale bars in µm.

FIGURE 26. Metaverruca recta. A. Cirrus I, B. Cirrus II, C. Caudal appendage.