Nitidotachinus dui Li, 1999

Zheng, Dan-Lin, Li, Li-Zhen & Zhao, Mei-Jun, 2014, Review of Nitidotachinus Campbell (Staphylinidae, Tachyporinae) from Mainland China, ZooKeys 447, pp. 87-107 : 90-91

Taxon classification Animalia Coleoptera Staphylinidae

Nitidotachinus dui Li, 1999 Figs 1C, 4

Nitidotachinus dui Li, 1999: 197; Schülke 2000: 907; Herman 2001: 850; Smetana 2004: 340.

Specimens examined.

China: 1 male (holotype), 1 female (paratype), Mt. West Tianmu Reserve, Lin’an City, Zhejiang Prov., 6-12.V.1998, Li-Zhen Li leg.; 1 male, 8 females, same locality as above, (alt. 300-400m), 11-15.VI.2006, Jia-Yao Hu and Liang Tang leg.; 1 female, Mt. Longwang Reserve (alt. 300-500m), Anji County, Zhejiang Prov., 24.IV.2004, Liang Tang leg.; 4 males, 7 females, Danzhu (alt. 450-600m), Xianju County, Zhejiang Prov., 2.VI.2006, Jin-Wen Li and Shan-Jia Shen leg.; 1 male, Mt. Dapan Reserve (alt. 550-700m), Pan’an County, Zhejiang Prov., 7.VI.2006, Jin-Wen Li and Shan-Jia Shen leg.; 3 female, same locality and collectors as above, 6.VI.2006; 1 female, Qingliangfeng (alt. 1050-1070m), Lin’an City, Zhejiang Prov., 9.V.2005, Li-Long Zhu and Li-Zhen Li leg.

Description.

Body (Fig. 1C) relative small in size, 4.8-5.0 mm (total length); 2.6-2.8 mm (length of forebody). Color piceous, shining; head black; 1st and 2nd antennal segments, mouthparts, lateral margins of pronotum, narrow apical margins of abdominal segments, and tarsi light reddish brown; disc of pronotum, 3rd to 11th antennal segments, and legs except for tarsi dark reddish brown.

Head subtriangular, 0.48 times as wide as pronotum; surface finely and sparsely punctate, with dense microsculpture consisting of irregular meshes and transverse wave lines. Antennae moderately long, reaching backward to the apical third of elytra; 1st and 2nd segments glabrous except for a few long setae, 3th to 11th densely pubescent; the relative length of each segment from base to apex: 12.0: 7.0: 17.0: 12.0: 15.0: 14.0: 14.0: 13.0: 13.0: 12.5: 17.0; the 10th segment twice as long as wide. Maxillary palpus moderately long, relative lengths of 4th and 3rd segments: 2.0: 1.0.

Pronotum broad, transverse, 0.63 times as long as wide, widest at basal third. Surface with dense and fine microsculpture consisting of transverse wave lines; punctures similar to those on head.

Elytra in sutural length 0.73 times as long as wide; 1.17 times as long as the median length of pronotum; sides gradually widened posteriad; apical margins sinuate. Surface with punctures courser and microsculpture somewhat finer than those on pronotum.

Abdomen gradually narrowed from base to apex. Surface sparsely and finely punctate and pubescent, with short transverse microsculpture only at sides of third tergite.

Male: Fore tarsal segments I–IV dilated; the relative lengths of hind tarsal segments from base to apex: 14.0: 5.0: 4.0: 4.0: 9.0. Eighth tergite (Fig. 4C) 4-lobed; inner lobes much longer than outer lobes. Sixth sternite (Fig. 4A) arcuately emarginate at middle in apical margin, with nine peg setae on each side of the emargination. Seventh sternite (Fig. 4B) subtriangularly depressed at middle in posterior part, deeply and sinuately emarginated in apical margin, sparsely covered with some peg setae near middle of the subtriangular depression, densely bordered by long black spiniform setae on posterior margin. Eighth sternite (Fig. 4D) 2-lobed, deeply incised between the lobes, the depth 0.33 times as long as the median length of sternite. Aedeagus (Figs 4 G–H) moderate in size, with parameres and median lobe fused, asymmetrical, narrowed apicad, distinctly widened and truncated at apices in ventral view.

Female: Fore tarsal segments 1-4 normal. Eighth tergite (Fig. 4E) 4-lobed; inner lobes slightly longer than outer lobes. Eighth sternite (Fig. 4F) 6-lobed; inner lobes much broader than intermediate lobes, fimbriate apically, separated from each other by a “V” shaped emargination.

Distribution.

China (Zhejiang Province).

Remarks.

This species can be easily recognized from the others of the genus by parameres and median lobe of aedeagus being fused and the asymmetrical truncated apices of parameres.