Fifteen new species of Sathytes Westwood from China (Coleoptera, Staphylinidae, Pselaphinae), with an updated checklist of world species Author Yin, Zi-Wei C515106C-5782-4471-AE11-483B49606A67 Laboratory of Systematic Entomology, College of Life Sciences, Shanghai Normal University, 100 Guilin Road, Xuhui District, Shanghai 200234, China. pselaphinae@gmail.com Author Shen, Qi 195E5F86-BD32-45F2-BF46-014394EF380F Laboratory of Systematic Entomology, College of Life Sciences, Shanghai Normal University, 100 Guilin Road, Xuhui District, Shanghai 200234, China. 2974259092@qq.com text European Journal of Taxonomy 2020 2020-10-26 722 37 74 journal article 10.5852/ejt.2020.722.1133 4134339 B9393832-6F0C-4649-AF54-CAAF43234326 Sathytes tianquanus sp. nov. urn:lsid:zoobank.org:act: 3303B110-9BE0-49BE-B87D-6E22C868629F Fig. 12 Differential diagnosis The male of S. tianquanus sp. nov. is morphologically close to that of S . obliquus Shen & Yin, 2020 ( Zhejiang ) and S . longitrabis ( Shaanxi ) in the apophysis of antennomere 9 located at anterior half of the segment. It differs from S . obliquus by the much more transverse antennomere 9; and from S . longitrabis Fig. 12. Sathytes tianquanus 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. by the larger body size ( 2.92 mm vs 2.21–2.42 mm ), more elongate antennomere 11 and more transverse antennomere 9. Etymology The new species is named after Tianquan County, where the type locality of this species is situated. Type material ( 5 specimens ) Holotype CHINA • ♂ ; Sichuan , Tianquan ( XAEn ), Er’lang Shan ( ĹḇƜ ); 29°52′23″ N , 102°48′34″ E ; alt. 2200–2300 m ; 13 Jul. 2012 ; Z. Peng and Z.-W. Yin leg.; old pass; leaf litter, sifted ; SNUC . Paratypes CHINA • 4 ♀♀ ; same collection data as for holotype; SNUC . Description Male MEASUREMENTS. AeL = 0.32 mm ; AnL = 1.34 mm ; AL = 0.79 mm ; AW = 0.92 mm ; TBL = 2.92 mm ; EL = 0.89 mm ; EW = 1.07 mm ; HL = 0.61 mm ; HW = 0.58 mm ; LE = 0.19 mm ; LT = 0.18 mm ; PL = 0.63 mm ; PW = 0.63 mm . Body ( Fig. 12A ) reddish-brown, mouthparts and tarsi paler. Head slightly longer than wide. Each eye composed of about 22 facets; LE:LT = 1.1. Antennal clubs ( Fig. 12B ) formed by antennomeres 9–11; antennomere 9 ( Fig. 12C ) broadest at apical ¼, each with semi-membranous apophysis at apex of mesal expansion; antennomere 10 strongly transverse, obconical; antennomere 11 ( Fig. 12B ) about 1.6 times as long as wide, each with large basal protuberance bearing tuft of long apical setae at apex ( Fig. 12D ). Pronotum about as long as wide. Elytra moderately transverse. Abdomen widest at tergite 1 (IV) and narrowing apically. Aedeagus ( Fig. 12E ) slightly asymmetrical at apex. Female MEASUREMENTS.AnL= 1.20–1.21 mm ; AL = 0.90–0.91 mm ; AW = 0.89–0.90 mm ; TBL = 2.81–2.85 mm ; EL = 0.74–0.75 mm ; EW = 0.96–0.97 mm ; HL = 0.57–0.58 mm ; HW = 0.53–0.54 mm ; LE = 0.15 mm ; LT = 0.16 mm ; PL = 0.60–0.61 mm ; PW = 0.60–0.61 mm . Slightly smaller than male in size. Each eye composed of about 16 facets; LE: LT = 0.9. Antennal clubs lacking modifications. Distribution China : Sichuan .