Sathytes xizangensis, Yin & Shen, 2020

Yin, Zi-Wei & Shen, Qi, 2020, Fifteen new species of Sathytes Westwood from China (Coleoptera, Staphylinidae, Pselaphinae), with an updated checklist of world species, European Journal of Taxonomy 722, pp. 37-74 : 63-65

Sathytes xizangensis sp. nov.

urn:lsid:zoobank.org:act:F9F70319-A210-4FAC-A99E-1176460E4E55

Fig. 16

Differential diagnosis

The male of S. xizangensis sp. nov. is morphologically similar to that of S. grandis ( Nepal) , S. chayuensis sp. nov. ( China: Xizang), S. magnus ( China: Xizang) and S. tangliangi ( China: Yunnan) in sharing the single basal protuberance of antennomere 11 and oblique mesal margin of antennomere 9. It can be separated from S. grandis and S. magnus by the much smaller body size (2.53–2.73 mm vs 3 mm for S. grandis and 3.36 mm for S. magnus ) and more distal position of the apophysis of antennomere 9; from S. chayuensis sp. nov. by the much shorter antennomere 11; and from S. tangliangi by the larger basal protuberance and more distal position of the apophysis of antennomere 9.

Etymology

The new species is named after Xizang Province (= Tibet), where the type locality of this species is situated.

Type material (29 specimens)

Holotype

CHINA • ♂; Xizang, Nyingchi, Pailong Country ; 30°0′34.71″ N, 94°57′57.64″ E; alt. 2190 m; 15 Jul.– 1 Aug. 2019; Z.-W. Yin leg.; FIT (flight intercept trap); SNUC.

Paratypes

CHINA • 23 ♂♂, 2 ♀♀; same collection data as for holotype; SNUC • 2 ♂♂; Xizang, Linzhi City, Pailong Village ; alt. 2069 m, 30°01′11.11″ N, 95°00′0.46″ E; 15 Mar. 2017; X.-B. Song leg.; SNUC • 1 ♂; Xizang, Linzhi City, near Pailong village; 30°01′10″ N, 94°59′48″ E; alt. 2040 m; 6 Jul. 2018; Cheng, Peng and Shen leg.; mixed leaf litter, sifted; SNUC .

Description

Male

MEASUREMENTS. AeL = 0.22 mm; AnL = 1.25–1.29 mm; AL = 0.65–0.73 mm; AW = 0.82–0.88 mm; TBL = 2.53–2.73 mm; EL = 0.76–0.83 mm; EW = 0.95–1.01 mm; HL = 0.55–0.58 mm; HW = 0.46– 0.49 mm; LE = 0.17 mm; LT = 0.17 mm; PL = 0.57–0.59 mm; PW = 0.55–0.57 mm.

Body ( Fig. 16A ) reddish-brown, mouthparts and tarsi paler. Head longer than wide. Each eye composed of about 22 facets; LE: LT = 1. Antennal clubs ( Fig. 16B ) formed by antennomeres 9–11; inner margin of antennomere 9 ( Fig. 16C ) moderately oblique, semi-membranous apophysis at middle of mesal margin; antennomere 10 transverse, obconical; antennomere 11 ( Fig. 16B ) about 1.7 times as long as wide, each with single basal protuberance covered with tuft of setae at apex ( Fig. 16D ). Pronotum approximately as long as broad. Elytra moderately transverse. Abdomen widest at tergite 1 (IV) and narrowing apically. Aedeagus ( Fig. 16E ) almost symmetrical.

Female

MEASUREMENTS.AnL= 1.17–1.21 mm; AL = 0.77–0.78 mm; AW = 0.78–0.79 mm; TBL = 2.58–2.67 mm; EL = 0.71–0.73 mm; EW = 0.88–0.90 mm; HL = 0.54–0.58 mm; HW = 0.46–0.49 mm; LE = 0.15 mm; LT = 0.17 mm; PL = 0.56–0.58 mm; PW = 0.54–0.56 mm.

Similar to male in size. Each eye composed of about 20 facets; LE:LT = 0.9. Antennal clubs lacking modifications.

Distribution

China: Xizang.

Figures

Fig. 16. Sathytes xizangensis sp. nov., ♂ (population of Pailong). A. Dorsal habitus. B. Antennal club. C. Antennomere 9. D. Modification of antennomere 11, enlarged. E. Aedeagus, ventral view. Scale bars: A = 0.5 mm; B = 0.2 mm; C, E = 0.1 mm; D = 0.05 mm.