Pselaphodes aduncus, Huang & Li & Yin, 2018

Huang, Meng-Chi, Li, Li-Zhen & Yin, Zi-Wei, 2018, Eleven new species and a new country record of Pselaphodes (Coleoptera: Staphylinidae: Pselaphinae) from China, with a revised checklist of world species, Acta Entomologica Musei Nationalis Pragae 58 (2), pp. 457-478 : 458-459

Pselaphodes aduncus sp. nov.

( Figs 1A , 2 )

Type material ( 1 ex.). HOLOTYPE: ♁, CHINA: ‘ China: Yunnan, Xishuangbanna (MṚDzḿ), Menglong Town (ÛAEü), Mengsong (Û ※), 20°30′41″N, 100°30′19″E, 1700 m, 03.iv.2018, sifting, Peng, Shen, Cheng leg.’ ( SNUC).

Diagnosis of male. Length 3.06 mm; antennomere XI constricted near base; metaventrite with one large, sheet median process; protrochanter with hook-like ventral spine; protibia with small projection at apex; mesotrochanter with acute ventral spine.

Description. Male ( Fig. 1A ). Body reddish brown, BL 3.06 mm. Head as long as wide, HL 0.63 mm, HW 0.63 mm; each eye composed of about 45 facets; with well-developed ocular canthus. Antennomeres IX–XI ( Fig. 2A ) forming distinct club, antennomeres IX–X enlarged and elongate, antennomere XI constricted near base. Pronotum ( Fig. 2B ) wider than long, PL 0.60 mm, PW 0.64 mm, rounded at anterolateral margins, strongly constricted at apical third. Elytra wider than long, EL 0.97 mm, EW 1.17 mm. Metaventral processes fused, sheet-like ( Fig. 2C ). Protrochanter ( Fig. 2D ) with hook-like ventral spine; protibia ( Fig. 2E ) with small apical projection; mesotrochanter with acute ventral spine ( Fig. 2F ); metatrochanter and metafemur ( Fig. 2G ) simple. Abdomen broad at base and narrowed apically, AL 0.86 mm, AW 1.15 mm. Sternite IX ( Fig. 2H ) semi-membranous. Length of aedeagus ( Figs. 2 I–K) 0.63 mm; median lobe broad and asymmetric, parameres elongate, almost symmetric, endophallus composed of one elongate and one short sclerite.

Female. Unknown.

Comparative notes. The unique form of the antennomere XI, presence of one large, sheet-like median process of the metaventrite, hook-like ventral spine of the protrochanter, and structure of the aedeagus readily separate P. aduncus from all other known congeners.

Etymology. The specific epithet is the Latin adjective aduncus referring to the hook-like spine of the protrochanter in the male of the new species.

Distribution. China: Yunnan.

Figures

Fig. 1. Dorsal habitus of Pselaphodes males. A – P. aduncus sp. nov.; B – P. anjiensis sp. nov. Scale bar: 1 mm.

Fig. 2. Male diagnostic features of Pselaphodes aduncus sp. nov. A – antennal club; B – pronotum; C – metaventral process, in lateral view; D – protrochanter and profemur; E – apex of protibia; F – mesotrochanter and mesofemur; G – metatrochanter and metafemur; H – sternite IX; I–K – aedeagus, in dorsal (I), lateral (J), and ventral (K) view. Scale bar: 0.3 mm in A–B, D, F–G; 0.2 mm in C, I–K; 0.1 mm in E, H.