Sathytes transversus, 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 : 58-60

Sathytes transversus sp. nov.

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Fig. 13

Differential diagnosis

The male of S. transversus sp. nov. is most similar to that of S. usitatus from Yunnan in the similar form of the antennomeres 9 and 11, but can be clearly separated form it by the larger body size ( 2.61–2.72 mm vs 2.23–2.42 mm), more posteriorly located apophysis of antennomere 9 and longer basal protuberance of antennomere 11.

Etymology

The specific name refers to the strongly transverse antennomere 9 of the male.

Type material ( 7 specimens)

Holotype

CHINA • Ƌ; 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 • 3 ƋƋ, 1 ♀; same collection data as for holotype; 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 • 1 Ƌ; Xizang, Motuo County, near 80 K; 29°41′09″ N, 95°30′10″ E; alt. 2330 m; 9 Jul. 2018; Cheng, Peng and Shen leg.; mixed leaf litter, sifted; SNUC .

Description

Male

MEASUREMENTS. AeL = 0.24 mm; AnL = 1.19–1.22 mm; AL = 0.73–0.75 mm; AW = 0.82–0.83 mm; TBL = 2.61–2.72 mm; EL = 0.74–0.77 mm; EW = 0.96–0.99 mm; HL = 0.55–0.58 mm; HW = 0.51– 0.53 mm; LE = 0.17 mm; LT = 0.16 mm; PL = 0.59–0.62 mm; PW = 0.53–0.57 mm.

Body ( Fig. 13A ) reddish-brown, mouthparts and tarsi paler. Head slightly longer than wide. Each eye composed of about 20 facets; LE:LT = 1.1. Antennal clubs ( Fig. 13B ) formed by antennomeres 9–11; antennomere 9 ( Fig. 13C ) strongly transverse, each with semi-membranous apophysis at apex of mesal expansion, and at approximately apical ²/5 of antennomere; antennomere 10 strongly transverse, obconical; antennomere 11 ( Fig. 13B ) about 1.4 times as long as wide, each with single moderately long basal protuberance covered with tuft of setae at apex ( Fig. 13D ). Pronotum about slightly longer than wide. Elytra moderately transverse. Abdomen widest at tergite 1 (IV) and narrowing apically. Aedeagus ( Fig. 13E ) slightly asymmetrical at apex.

Female

MEASUREMENTS. AnL = 1.16 mm; AL = 0.71–0.72 mm; AW = 0.86–0.87 mm; TBL = 2.52–2.55 mm; EL = 0.69–0.70 mm; EW = 0.91–0.92 mm; HL = 0.56 mm; HW = 0.49 mm; LE = 0.13 mm; LT = 0.16 mm; PL = 0.56–0.57 mm; PW = 0.55–0.56 mm.

Slightly smaller than male in size. Each eye composed of about 16 facets; LE: LT = 0.8. Antennal clubs lacking modifications.

Distribution

China: Xizang.

Figures

Fig. 13. Sathytes transversus sp. nov., Ƌ (population from 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.