Trisinus shaolingiger Yin and Nomura

Yin, Zi-Wei, Nomura, Shûhei & Zhao, Mei-Jun, 2012, Batrisoplisus Raffray, 1908, a new synonymy of Trisinus Raffray, 1894 (Coleoptera, Staphylinidae, Pselaphinae), with description of three new Chinese species, Zootaxa 3222, pp. 61-68 : 62-64

Trisinus shaolingiger Yin and Nomura , new species

( Figs. 1 , 3, 6, 9, 12)

Type material (23). Holotype: CHINA: 3, labeled ‘ CHINA: Yunnan Prov. / Nabanhe N. R. / Bengganghani, Nanmugahe / N22.08.383 E100.34.126 / 13.xi.2008, alt. 1,700 m / J.Y. Hu & L. Tang leg.’ ( SNUC). Paratype: CHINA: 3, same label data as the holotype, except ‘...Bengganghani / Shanshenmiao / N22.08.450 E100.35.289 / 11.xi.2008, alt. 1,700 m’ ( SNUC).

Description. Male. Body ( Fig. 1 ) yellowish-brown, maxillary palpi and tarsi lighter; body length 1.64–1.72 mm, body width 0.68–0.7 mm.

Head slightly wider than long, coarsely punctate; clypeus short and roundly expanded anteriorly; frons weakly depressed medially; vertexal foveae connected by U-shaped sulcus; postgenae slightly narrowed; gula with single median fovea. Eyes convex and ovoid. Antennae (Fig. 3) with antennomere IX extremely protrude and gradually narrowed laterally. Maxillary palpi short, palpomeres I minute, II elongate, expanded at apical 2/3, III slightly longer than wide, subcylindrical, IV largest, fusiform.

Pronotum slightly wider than long, expanded laterally, coarsely punctate at median portion, smooth at lateral portions; lateral antebasal foveae present; basal margin of pronotum with both inner and outer pair of basolateral foveae. Elytra wider than long, coarsely punctate; each elytron with two basal foveae; subhumeral fovea present; discal striae reaching 4/5 of elytral length; marginal sulcus extended from subhumeral fovea to posterior margin. Venter with lateral mesoventral foveae straightly inserted; median mesoventral foveae widely forked; lateral mesocoxal foveae and lateral metaventral foveae present; paired small projections located posterior to metacoxae. Legs normally elongate; mesotibiae (Fig. 6) with tiny apical spine.

Abdomen roundly narrowed posteriorly, covered with setae; tergite IV largest, more than four times as long as tergite V, with thick triangular ridge formed by inner and outer marginal carinae; median basal foveae shallow; basolateral foveae present; discal carinae reaching 1/3 of tergal length; tergite V–VI subequal in length, each transverse; VII twice as long as VI, VIII transverse, strongly convex at middle, with two long setae, arcuately emarginate at posteromedian margin; sternite IV with large mediobasal foveae and setose basolateral foveae, V–VII subequal in length, VIII broad and transverse, concave at median portion, IX semi-membranous.

FIGURES 3–8. Details of Trisnus shaolingiger (3, 6), T. pharelatus (4, 7) and T. shuixiuifer (5, 8). 3–5. Male antenna. 6–8. Mesotibia. Scale bars: 0.2 mm.

Aedeagus ( Figs. 9, 12 ) asymmetric, ventral stalk expanded apically in ventral views; dorsal lobe sharpened at apex.

Female. Unknown.

Distribution. Southwest China: Yunnan Province.

Remarks. This species can be readily distinguished from its Chinese congeners by the form of the unique strongly modified antennomere IX.

Etymology. The species name is a combination of the word ‘shaolinge’, an ancient Chinese weapon and the Latin suffix ‘ -ger ’ meaning ‘armed by’. The name refers to the unique shape of the male antenna.

Figures

FIGURES 1 – 2. Male habitus of Trisinus shaolingiger (1) and T. pharelatus (2). Scale bars: 0.5 mm.

FIGURES 9 – 14. Aedeagus of Trisinus shaolingiger (9, 12), T. pharelatus (10, 13) and T. shuixiuifer (11, 14). 9 – 11. Lateral view. 12 – 14 Ventral view. Scale bars: 0.1 mm.