Poecilasma obliqua Hoek 1907
Creators: name: Chan, Benny K. K.
name: Hayashi, Ryota
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Pedunculata
Poecilasmatidae
Poecilasma
Poecilasma obliqua

description: Poecilasma obliqua (Hoek, 1907)
(Figs. 2 E, 12, 13)
Poecilasma oblequum Hoek, 1907: 12, pl. 1, figs. 11–22.— Liu & Ren 1985: 231, fig 27: pl. 6: 17. Poecilasma (Trilasmis) oblequum.— Krüger, 1911: 39.
Temnaspis obliqua.— Broch, 1931: 128.
Trilasmis (Poecilasma) oblique.— Hiro 1937b: 408, figs. 8–9.— Hiro 1937a: 83, fig. 68.
Material examined. RUMF-ZC-1560, one specimen (13.2 mm) on Chaceon granulatus (Sakai) (Brachyura, Geryionidae RUMF-ZC-1093); collected by a bait trap off Kumejima, 26°17.433´N 126°43.142´E – 26°17.498´N 126°42.487´E, 19–20 Nov. 2009, depth 457– 547 m.
Diagnosis. Capitulum globular, white, plates smooth. Tergum very narrow, occludent margin very short.
Description. Capitulum globular, white; 5 capitular plates - 1 carina, paired tergum and scutum. Tergum triangular, very narrow; occludent margin shortest (Fig. 2 E). Scutum D-shaped; tergal and carinal margins convex; occludent margin straight, vertical; basal margin perpendicular to occludent margin (Fig. 2 E). Peduncle yellow, with concentric rings (Fig. 2 E).
Maxilla globular; all margins setose; setae simple. Maxillule strongly notched; two large setae above notch, one large setae in notch; region below notch protuberant; short setae below (Fig. 12 A, B). Mandible with 4 teeth, first separated from remainder; cutting margin smooth; inferior angle acute (Fig. 12 C, D). Mandibular palps subtriangular, tapering distally (Fig. 12 E); serrulate setae distally (Fig. 12 F) and on exterior margin. Labrum concave with numerous (>100) small, sharp teeth (Fig. 12 G, H).
Cirrus I with 1 oval shaped filamentary appendage at base (Fig. 13 B); anterior and posterior rami 8- and 6-segmented, respectively (Fig. 13 A); large, robust, short simple setae at tip of both rami and on segment junction of greater curvature of ramus (Fig. 13 E); serrulate setae along mid and proximal region of lesser curvature of ramus (Fig. 13 C, D). Setal type of cirri II–VI simple. Cirrus II, anterior and posterior rami 10- and 17-segmented, respectively. Cirri III and IV with anterior and posterior rami 13- and 14-segmented, respectively. Cirrus V with anterior and posterior rami 12- and 13-segmented, respectively. Cirrus VI with anterior and posterior rami 14-segmented; intermediate segment of lesser curvature of posterior ramus with 7 to 10 serrulate setae at junction of each segment (Fig. 13 F). Caudal appendage short, length similar to height of proximal segment of pedicel of cirrus VI; serrulate setae distally (Fig. 13 G). Penis setose, large bundle of setae distally (Fig. 13 H).
Distribution. Pacific Ocean, South China Sea.
Remarks. This species has been recorded previously in Japanese waters (Hiro 1937b).
description: Published as part of Chan, Benny K. K. & Hayashi, Ryota, 2012, Epibiotic barnacles (Crustacea: Cirripedia: Thoracica) collected by the Kumejima 2009 Expedition, with descriptions of two new species *, pp. 21-48 in Zootaxa 3367 on page 39, DOI: 10.5281/zenodo.281652