Labomimus howaichuni, Zhang & Li & Yin, 2019

Zhang, Yu-Qing, Li, Li-Zhen & Yin, Zi-Wei, 2019, Fifteen new species and a new country record of Labomimus Sharp from China, with a checklist of world species (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 4554 (2), pp. 497-531 : 508

Labomimus howaichuni sp. nov.

( Figs 7B , 9 )

Type material (2 ♂♂, 5 ♀♀). Holotype: CHINA: ♂: ‘ China : Hong Kong, Ng Tung Chai (梧桐 寨), leaf, decaying wood, sifted, ca. 150 m, 04.iv.2013, X.- B. Song & Z.- W. Yin leg.’ (SNUC). Paratypes: CHINA: 1 ♂, 5 ♀♀: same data as the holotype ( SNUC) .

Diagnosis of male. Length 3.47–3.81 mm; antennomeres IX–XI elongate, lacking modification; short metaventral processes narrowing toward apex; protrochanter and profemur each with small ventral spine, protibia with tiny apical projection; mesotrochanter with two ventral spines; aedeagus strongly asymmetric, with median lobe strongly elongate and round at apex.

Description. Male ( Fig. 7B ). Length 3.47–3.81 mm. Head slightly longer than wide, HL 0.74–0.77 mm, HW 0.69–0.72 mm; eyes prominent, each composed of about 40 facets. Antenna with scape about 2.8 times as long as wide, antennomeres II–VIII more or less elongate, antennomeres IX–X ( Fig. 9A ) enlarged, much longer than wide. Pronotum ( Fig. 9B ) longer than wide, PL 0.69–0.74 mm, PW 0.68–0.69 mm, sides slightly angulate at apical third. Elytra much broader than long, EL 0.90–0.99 mm, EW 1.28–1.34 mm. Metaventral processes ( Fig. 9C ) short, narrowing apically. Protrochanter ( Fig. 9D ) with small spine at ventral margin, profemur with small but distinct spine at middle, protibia ( Fig. 9E ) with tiny projection at apex; mesotrochanter ( Fig. 9F ) with two small spines at ventral margin, mesofemur simple; metacoxa, metatrochanter, and metafemur ( Fig. 9G ) simple. Abdomen broad at base and narrowed posteriorly, AL 1.14–1.31mm, AW 1.23–1.34 mm; tergite IV longest, more than twice as long as tergite V; sternite IX as in Fig. 9H . Length of aedeagus ( Fig. 9 I–K) 0.62 mm; elongate median lobe asymmetric, curved dorso-ventrally and narrowing apically; parameres short.

Female. Similar to male in general appearance; eyes smaller, each composed of about 23 facets; antennae simple, lacking metaventral processes. Measurements: BL 2.80–2.89 mm, HL 0.54–0.55 mm, HW 0.53–0.54 mm, PL 0.57–0.58 mm, PW 0.53–0.54 mm, EL 0.66–0.67 mm, EW 1.01–1.08 mm, AL 1.03–1.09 mm, AW 1.09–1.20 mm.

Distribution. China: Hong Kong.

Etymology. The specific epithet is named after Ho Wai-Chun ( Hong Kong) for his various helps in the field.

Comparative notes. The new species can be readily separated from all congeners by the relatively large body size, simple and elongate antennal clubs, weakly modified and elongate legs, and particularly, the unique form of the aedeagus.

Figures

FIGURE 7. Dorsal habitus of Labomimus males. A. L. dulongensis. B. L. howaichuni. Scale bar: 1 mm.

FIGURE 9. Diagnostic features of Labomimus howaichuni, male. 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: A, B, D, F, G = 0.3 mm; C, I, J, K = 0.2 mm; H = 0.1 mm; E = 0.05 mm.