Labomimus sugayai, 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 : 558-560

Labomimus sugayai sp. nov.

( Figs 3B , 5 )

Type material (30 exs). Holotype: CHINA: Taiwan: ♂: ‘ Szuling , TAOYUAN , TAIWAN (桃园縣四陵), 1100 m, 19.XI. 2000, Hroshi Sugaya leg. (in the leaf litter).’ ( MHNG) . Paratypes: CHINA: Taiwan: 9 ♂♂, 4 ♀♀: same data as the holotype ( MHNG, SNUC); 3 ♂♂, 4 ♀♀: ‘ Chihpenwenchuan , TAITUNG , TAIWAN, 台東縣知本溫泉

(400 m) 6–8.XI. 2000, Hroshi Sugaya leg. (in the leaf litter)’ ( MHNG, SNUC); 1 ♂, 2 ♀♀: ‘ Nanshanchi (800 m) , NANTOU, TAIWAN, 南投 縣南山溪 , 28.V. 2000, Hroshi Sugaya leg. (in the leaf litter)’ ( MHNG); 1 ♂, 1 ♀: ‘ Aowanta (1400 m) , NANTOU, TAIWAN, 南投 縣奧萬大 , 15.XI. 2000, Hroshi Sugaya leg. (in the leaf litter)’ ( MHNG); 1 ♂: ‘ Shouchia (300 m) , PINTUNG, TAIWAN, 屏東縣壽卡, 5.XI. 2000, Hroshi Sugaya leg. (in the leaf litter)’ ( MHNG); 1 ♀: ‘ Kenting-kunyen , PINTUNG TAIWAN, 屏東縣墾公園 , 4.XI. 2000 (300 m), Hroshi Sugaya leg. (in the leaf litter)’ ( MHNG); 1 ♂, 1 ♀: ‘ TAIWAN, Nantou Hsien, Shanlingchi , 1650 m , 16. V. 1990, A. Smetana. ’( MHNG) .

Diagnosis of male. Length over 3.50 mm; postgenae broadly expanded laterally. Antennomeres 9–11 elongate, unmodified; antennomere 9 much longer than wide. Pronotum with round lateral margins; metaventral processes moderately elongate, apically broadened. Protibiae with small apical spine; mesotrochanters with distinct ventral spine; metacoxae with blunt ventral projection. Aedeagus elongate, median lobe asymmetric at apex, with pointed apex.

Description. Male ( Fig. 3B ). Length 3.73–3.91 mm. Head longer than wide, HL 0.86–0.92 mm, HW 0.77– 0.87 mm; postgenae broadly expanded laterally; eyes prominent, each composed of about 32 facets. Antennae with scape (antennomere 1) about 4.0 times as long as wide, antennomeres 2–8 more or less elongate, antennomeres 9– 11 ( Fig. 5A ) enlarged, antennomere 9 much longer than wide. Pronotum ( Fig. 5B ) slightly longer than wide, PL 0.74–0.76 mm, PW 0.69–0.72 mm, with round lateral margins. Elytra much broader than long, EL 0.8 5– 0.88 mm, EW 1.16–1.26 mm. Metaventral processes ( Fig. 5C ) moderately elongate, apically broadened in lateral view. Protrochanters ( Fig. 5D ) and profemora simple, protibiae ( Fig. 5E ) with small, acute spine at apex; mesotrochanters ( Fig. 5F ) with small, sharp spine at ventral margin, mesofemora simple; metacoxae ( Fig. 5G ) with distinct, blunt ventral projection. Abdomen broad at base and narrowed posteriorly, AL 1.19–1.31 mm, AW 1.06– 1.23 mm; tergite 1 (IV) longest, about twice as long as tergite 2 (V); sternite 7 (IX) as in Fig. 5H . Length of aedeagus ( Fig. 5 I–K) 0.56 mm; median lobe asymmetric, narrowing apically in dorso-ventral view; elongate parameres strongly broadened dorso-ventrally, extending beyond apex of median lobe, rounded at apex; endophallus composed of one elongate and one short sclerite.

Female. Similar to male in general appearance; eyes smaller, each composed of about 32 facets; antennae simple, lacking metaventral processes; mesotrochanters with two distinct spines at ventral margin. Measurements: BL 3.66–3.81 mm, HL 0.83–0.85 mm, HW 0.68–0.69 mm, PL 0.72–0.74 mm, PW 0.71–0.72 mm, EL 0.85–0.88 mm, EW 1.23–1.29 mm, AL 1.26–1.34 mm, AW 1.29–1.40 mm.

Distribution. China: Taiwan.

Etymology. The specific epithet is dedicated to Hroshi Sugaya, who collected a majority of the specimens of the new species.

Comparative notes. The new species is placed as a member of the L. shibatai -group based on the laterally expanded postgenae of the male. It is most similar to L. sichuanicus Hlaváč, Nomura & Zhou from Sichuan in the simple, unmodified antennal club, and similar spination of the legs and configuration of the aedeagus. These two species can be separated by using the following key.

Figures

FIGURE 3. Dorsal habitus of Labomimus dilaticeps (A), and L. sugayai (B). Scale bar: 1.0 mm.

FIGURE 5. Diagnostic features of Labomimus sugayai, 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), 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.