Sinoscalpellum sinensis, Xian-Qiu & Zhong-Li, 2014

Xian-Qiu, Ren & Zhong-Li, Sha, 2014, Description of a new genus and species of the subfamily Arcoscalpellinae Zevina, 1978 (Cirripedia: Thoracica: Scalpellidae) from deep waters of the South China Sea, Journal of Natural History 48 (17), pp. 1055-1060 : 1057-1059

Sinoscalpellum sinensis sp. nov.

( Figure 1 )

Holotype

K120110-3. Capitulum : length 7.6 mm, width 3.8 mm. Peduncle : length 1.2 mm, width 0.8 mm. Attached on sediment grain. Agassiz trawl. Collected from South China Sea, St.MBMCAS007, 17°15.0209 ′ N, 112°20.1947 ′ E. 13 September 2011. Depth 1238 m. Xu Kui-Dong, Zhang Jun-Long and Ning Ping Coll.

Diagnosis

Female, capitulum large, shuttle-shaped, 14 calcified plates fully covered, white, membranous interspace narrow, growth lines indistinct. Scutum larger, irregular rectangular, growth line weak, umbo apical, slightly covered tergum, rostral margin arched, rostral part of tergal margin slightly concave, lateral margin slightly arched. Tergum large, triangular, umbo apical, rostral margin straight, carinal margin slightly median concave, scutal margin nearly straight. Carina arched, dorsal surface smooth, longitudinal hollow absent or indistinct, umbo apical. Upper latus rectangular, scutal margin straight, umbo on sub-medial of scutal margin, tergal and carinal margins straight, median of basal margin slightly concave. Carinal latus rectangular, narrow and long, ratio of long and wide about 14:5, umbo at basi-carinal angle, two lateral plates intersecting each other on dorsal surface, upper carinal angle slightly acute, basi-rostral angle acute and reaching low-rostral angle of inframedian latus. Rostral latus triangular, rectangular in ventral view; scutal margin longer than basimargin, at upper part of protuberances of inframedian latus, umbo at upper rostral angle. Inframedian latus narrow and long, funnel-shape, rostral margin slightly concave, carinal margin longest, slightly arched, scutal margin straight, tergal margin straight and short, umbo at basi-rostral angle, as acute angle below rostral latus and protruded beyond rostral latus. Rostrum small, round triangular, between umbos of two rostral latera.

Peduncle shorter than capitulum, with transverse scales; attached to sediment grain.

Dorsal surface of prosoma smooth.

Labrum bullate, crest with a row of small teeth. Mandible with three teeth, inferior angle pectinate. Cutting edge of maxilla I with a notch and setae, with three large spines above and four spines below. Maxilla II with distinct notch on frontal portion, with setae, maxillar lobe slender and long. Palp small, conical, with setae.

Numbers of segments of cirri I– VI of holotype as follows :

I II III IV V VI

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10 12 17 18 17 18 18 18 19 18 18 17

Anterior ramus of cirrus I shorter than posterior. Anterior and posterior rami of II–VI sub-equal in length, slender and long, each of intermediate segments bears four or five pairs of setae on anterior margin, dorsal margin of segments with small teeth. Caudal appendage slender, five segments, with setae. Penis absent. Dwarf male not known.

Etymology

The sinensis is from Latin for Chinese.

Habitat

Based on this record, the new species, which has not yet been found elsewhere in tropical deep seas, should be attached to sediment grains.

Figures

Figure 1. Sinoscalpellum sinensis sp. nov. (A) Side view of body; (B) dorsal view of carinal latus; (C) ventral view of rostrum, inframedian latus and rostral latus; (D) soft body; (E) labrum and palp; (F) mandible; (G, H) maxilla I; (I) maxilla II; (L) caudal appendage and basal part of cirrus VI; (J) intermediate segment of cirrus IV; (K) intermediate segment of cirrus VI.