Tachinus (s. str.) yini Feng, Li & Schuelke

Feng, Ting, Schuelke, Michael & Li, Li-Zhen, 2013, A taxonomic revision of the silphaeformis species-group of the genus Tachinus Gravenhorst (Staphylinidae, Tachyporinae) from China, ZooKeys 359, pp. 53-99 : 80-84

Tachinus (s. str.) yini Feng, Li & Schuelke sp. n. Figs 7C, 7D, 9N, 10N, 12E, 14B, 17B, 19F, 20O, 22E

Type locality.

China, Sichuan Province, Luding, Hailuogou Natural Reserve.

Type material.

Holotype: ♂, CHINA: Sichuan Prov. Ganzi A. R., Luding County, Hailuogou, alt. 3,000 m, 21.vii.2006, HU & TANG leg. (SNUC). Paratypes: 17 ♂♂, 29 ♀♀, same data as for the holotype (SNUC); 95 ♂♂, 96 ♀♀, CHINA: Sichuan Prov., Gonggashan–Hailuogou, 29°35'N, 102°00'E, 2800-3200 m, 3-6.vii.1994, D. Král & J. Farkač leg. (cSme, cSch); 40 ♂♂, 41 ♀♀, CHINA: Sichuan Prov., Gongga Shan, Hailuogou, above Camp 3, 3050 m, 29°35'N, 102°00'E, 6.vii.1996, A. Smetana, J. Farkač & P. Kabátek leg. (cSme, cSch); 10 ♂♂, CHINA: Sichuan Prov., Gonggashan mts., 29°53'N, 102°01'E, 4000 m, 9.-11.vii.1994, D. Král & J. Farkač leg. (NHMB, cSch); 6 ♂♂, 5 ♀♀, CHINA: Sichuan Prov., Gongga Shan, Hailuogou, above Camp 3, 3200 m, 29°35'N, 102°00'E, 7.vii.1996, A. Smetana, J. Farkač & P. Kabátek leg. (cSme, cSch); 2 ♂♂, 1 ♀, CHINA: Sichuan Prov., Gongga Shan, Hailuogou, in front of glacier 1, 2850 m, 29°35'N, 102°00'E, 7.vii.1998, A. Smetana leg. (cSme, cSch); 1 ♂, CHINA: Sichuan, Gongga Shan, Hailuogou, above Camp 3, 3200 m, 7.VII. 1996 29°35'N, 102°00'E / collected by J. Farkač, P. Kabátek and A. Smetana (NHMB); 23 ♂♂, 12 ♀♀, CHINA: W Sichuan, Rte. 138, 15 km W Kangding, 3250 m, 29°57'N, 101°54'E 19.VII.98, J. Král / 1998 China Expedition J. Farkač, D. Král, J. Schneider & A. Smetana (NHMB, cSch).

Description.

Measurements of males (holotype): BL 3.61-4.00 (3.61); FL 2.95-3.11 (2.95); PL 0.89-0.95 (0.95); EL 1.50-1.56 (1.56); SEL 0.10-0.12 (0.12); HW 0.83-0.89 (0.89); PW 1.39-1.45 (1.45); EW 1.56-1.61 (1.61); relative length of antennomeres I–XI: 20: 13: 14: 8: 12: 12: 12: 11: 12: 11: 28. Measurements of females: BL 4.06-4.34; FL 3.50-3.67; PL 0.89-1.06; EL 1.50-1.71; SEL 0.27-0.29; HW 0.83-0.89; PW 1.39-1.57; EW 1.56-1.65; relative length of antennomeres I–XI: 20: 14: 15: 9: 13: 13: 14: 12: 13: 14: 27.

Body (Figs 7C, 7D) black; head, antennomeres V–XI, pronotum, disc of elytra and abdomen black; posterior margin of elytra, posterior margin of posterior abdominal tergites and legs reddish brown. Mouthparts and basal four antennomeres sometimes brownish.

Head slightly transverse, HW: PW = 0.53-0.64 (0.61), surface with fine and sparse punctation, sometimes invisible between microsculpture, microsculpture very distinct, consisting of irregular meshes on disc, of more transvers meshes on posterior portion. Ocular setae fine but distinct. Antennomeres X shorter than wide.

Pronotum: PL: PW = 0.57-0.76 (0.66), surface with punctation finer than that of head, microsculpture consisting of transverse meshes.

Elytra, EL: PL = 1.58-1.75 (1.64), EL: EW = 0.93-1.00 (0.97), EW: PW = 1.08-1.16 (1.11) in males; EL: PL = 1.42-1.92, EL: EW = 0.91-1.10, EW: PW = 0.99-1.19 in females; punctation denser and coarser than that of pronotum, microsculpture consisting of short transverse meshes.

Abdomen with punctation coarser than that of head, microsculpture consisting of transverse striae or meshes.

Male. Posterior margin of elytra slightly and evenly emarginate at middle. Sternite VII (Figs 9N, 10N) with apical margin broadly and deeply emarginate; apical margin bent ventrad, with broad area of coarse granules. Tergite VIII (Fig. 12E) dis tinctly transverse, lobes almost fused, apical margin weakly sinuate. Sternite VIII as in Fig. 14B. Median lobe of aedeagus (Fig. 17B) with pair of ear-shaped apical projections, parameres as broad as the projection of the median lobe, apically truncate.

Female. Elytra distinctly longer than in male, posterior margin broadly rounded, weakly produced near sutural angle. Abdominal tergite VIII (Fig. 19F) with sinuate posterior margin, lateral angles each with only one long seta. Fimbriate median lobes of sternite VIII (Fig. 20O) separated by shallow emargination, median lobes distinctly longer than sublateral ones.

Etymology.

The species is named after Zi-Wei Yin (Shanghai), for his various help during this study.

Remarks.

Males of this species can bes eparated from those of the other species by the aedeagal median lobe with broad ear-shaped apical projections. Females are distinguished by the sinuate posterior margin and the chaetotaxy of the lateral angles (each with only one long seta) of tergite VIII, from those of Tachinus maderianus by the shape of the sutural angle of the elytra.