Sathytes chayuensis, 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 : 42-44

Sathytes chayuensis sp. nov.

urn:lsid:zoobank.org:act:B95327A9-4E88-4DA8-818F-319126D7340A

Fig. 3

Differential diagnosis

The male of S. chayuensis sp. nov. can be separated from that of all congeners by a single basal protuberance on the terminal antennomere and by the remarkably elongate antennomere 11.

Etymology

The new species is named after Chayu County, where the type locality of this species is situated.

Type material (4 specimens)

Holotype

CHINA • ♂; Xizang, Chayu Co. (ṘḎn), Xiachayu To. (TṘḎđ), Talin Bridge (ŖWv); 28.53340539° N, 96.97800188° E; alt. 1541 m; 30 Jul. 2019; Liang Lü leg.; SNUC.

Paratypes

CHINA • 2 ♂♂, 1 ♀; same collection data as for holotype; SNUC .

Description

Male

MEASUREMENTS. AeL = 0.33 mm; AnL = 1.53–1.56 mm; AL = 0.76–0.79 mm; AW = 0.97–1.01 mm; TBL = 2.80–2.99 mm; EL = 0.93–0.96 mm; EW = 1.10–1.15 mm; HL = 0.58–0.61 mm; HW = 0.55– 0.57 mm; LE = 0.21 mm; LT = 0.21 mm; PL = 0.66–0.70 mm; PW = 0.64–0.68 mm.

Body ( Fig. 3A ) reddish-brown, mouthparts and tarsi paler. Head wider than long. Each eye composed of about 25 facets; LE:LT = 1. Antennal clubs ( Fig. 3B ) formed by antennomeres 9–11; antennomere 9 ( Fig. 3C ) slightly transverse, inner margin angularly expanded mesally, each with single semimembranous apophysis anterior to apex of expansion; antennomere 10 strongly transverse, obconical; antennomere 11 ( Fig. 3B ) about 2.1 times as long as wide, each with single apically concave basal protuberance covered with tuft of elongate setae at apex ( Fig. 3D ). Pronotum about as long as wide. Elytra strongly transverse. Abdomen widest at tergite 1 (IV) and narrowing apically. Aedeagus ( Fig. 3E ) flattened and slightly asymmetrical.

Female

MEASUREMENTS. AnL = 1.42 mm; AL = 0.91 mm; AW = 1.07 mm; TBL = 3.05 mm; EL = 0.98 mm; EW = 1.16 mm; HL = 0.67 mm; HW = 0.63 mm; LE = 0.19 mm; LT = 0.21 mm; PL = 0.71 mm; PW = 0.71 mm.

Slightly larger than male in size. Each eye composed of about 15 facets; LE: LT = 0.9. Antennal clubs lacking modifications.

Distribution

China: Xizang.

Figures

Fig. 3. Sathytes chayuensis sp. nov., ♂. 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.