Labomimus dadongmontis, Zhang & Yin, 2019

Zhang, Yu-Qing & Yin, Zi-Wei, 2019, Three new species of Labomimus Sharp (Coleoptera: Staphylinidae: Pselaphinae) from Taiwan, China, with an updated key for L. shibatai Sawada-group, Zootaxa 4586 (3), pp. 553-561 : 554

Labomimus dadongmontis sp. nov.

( Figs 1 , 2 )

Type material (17 exx) Holotype: CHINA: Taiwan : ♂: ‘Fengchif(h!)u (1950 m), CHIAI (= Chiayi, 嘉義) , TAIWAN, 奮起 湖 (大凍 山), 12–13. XI. 2000, Hroshi Sugaya leg. (in the leaf litter)’ ( MHNG) . Paratypes: CHINA: 5 ♂♂, 11 ♀♀: same data as the holotype ( MHNG, SHNU) .

Diagnosis of male. Length slightly over 3.0 mm. Antennomeres 9–10 enlarged, lacking obvious modification. Pronotum with round lateral margins. Metaventral processes short, narrowed apically. Mesotrochanters with tiny ventral spine; metacoxae with thin ventral projection. Aedeagus moderately stout, with symmetric median lobe.

Description. Male ( Fig. 1 ). Length 3.17–3.22 mm. Head longer than wide, HL 0.72–0.73 mm, HW 0.62–0.63 mm; eyes prominent, each composed of about 28 facets. Antennae with scape (antennomere 1) about 4.5 times as long as wide, antennomeres 2–8 more or less elongate, antennomeres 9–11 ( Fig. 2A ) enlarged, unmodified. Pronotum ( Fig. 2B ) slightly longer than wide, PL 0.63–0.70 mm, PW 0.58–0.69 mm, with round lateral margins. Elytra much broader than long, EL 0.68–0.73 mm, EW 1.12–1.17 mm. Metaventral processes ( Fig. 2C ) short, apically narrowing in lateral view. Protrochanters and profemora ( Fig. 2D ) simple; mesotrochanters ( Fig. 2E ) with small spine on ventral margin, mesofemora simple; metacoxae ( Fig. 2F ) with thin, apically narrowing projection on ventral margin. Abdomen broad at base and narrowed posteriorly, AL 1.06–1.14 mm, AW 1.20–1.23 mm; tergite 1 (IV) longest, more than twice as long as tergite 2 (V); sternite 7 (IX) as in Fig. 2G . Length of aedeagus ( Fig. 2 H–J) 0.49 mm; median lobe symmetric and apically rounded, narrowing toward apex; elongate parameres strongly broadened dorso-ventrally, rounded at apex; endophallus composed of one short and one long sclerite.

Female. Similar to male in general appearance; eyes smaller, each composed of about 24 facets; antennae simple, lacking metaventral processes; mesotrochanters with three distinct spines on ventral margin. Measurements: BL 3.39–3.62 mm, HL 0.75–0.78 mm, HW 0.58–0.62 mm, PL 0.68–0.70 mm, PW 0.69–0.70 mm, EL 0.68–0.88 mm, EW 1.16–1.25 mm, AL 1.20–1.31 mm, AW 1.28–1.41 mm.

Distribution. China: Taiwan.

Etymology. The new species is named after the type locality, i.e., Dadong Mountain.

Comparative notes. Labomimus dadongmontis is similar to L. jinfomontis Zhang, Li & Yin from Chongqing, and L. maoershanus Yin & Li from Guangxi in sharing simple male antennal clubs. It can be readily separated from L. jinfomontis by the foveae of the head and pronotum being more distinct, the relatively much longer antennomeres 1, 5, 6, and shorter antennomere 9, the much shorter metaventral processes, the different spination of the legs, as well as the much stouter and more asymmetric median lobe of the aedeagus. The new species clearly differs from L. maoershanus by the round lateral margin of the pronotum, which of the latter species are markedly angularly expanded.

Figures

FIGURE 1. Dorsal habitus of Labomimus dadongmontis. Scale bar: 1.0 mm.

FIGURE 2. Diagnostic features of Labomimus dadongmontis, male. A. Antennal club. B. Pronotum. C. Metaventral process, in lateral view. D. Protrochanter and profemur. E. Mesotrochanter and mesofemur. F. Metatrochanter and metafemur. G. Sternite IX. H–J. Aedeagus, in dorsal (H), lateral (I), and ventral (J) view. Scale bar: A, B, D, E, F = 0.3 mm; C, H, I, J = 0.2 mm; G = 0.1 mm.