Sathytes obliquus Shen & Yin, 2020

Shen, Qi & Yin, Zi-Wei, 2020, Five new species and a new record of Sathytes Westwood from eastern China (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 4751 (2), pp. 386-394 : 392-393

Sathytes obliquus Shen & Yin , sp. nov.

( Fig. 5 )

Type material ( 1 ex.). HOLOTYPE: CHINA: ♂, ‘ China: C. Zhejiang, Zhuji City, Caota Town (草»镇), Dashanxia Vill. (± ƜTIJ), 29°38’44”N, 120°07’53”E, leaf litter, sifted, 100 m, 29.v.2012, T-X. Zhao leg.’ ( SNUC).

Diagnostic description. Male. Body ( Fig. 5A ) reddish-brown, mouthparts and tarsi paler. Body length 2.85 mm. Head slightly wider than long, length from anterior margin of clypeus to base 0.54 mm, width across eyes 0.60 mm. Each eye composed of about 20 facets. Length of eyes (0.17 mm) / length of tempora (0.15 mm) approximately 1.1:1. Length of antenna 1.39 mm; club ( Fig. 5B ) formed by antennomeres 9–11; antennomere 9 ( Fig. 5C ) broadest at apical 1/3, with semi-membranous apophysis at apex of expansion; antennomere 10 transverse, obconical; antennomere 11 ( Fig. 5B ) about 1.6 times as long as wide, with large apically truncate protuberance bearing tuft of long apical setae at base ( Fig. 5D ). Pronotum slightly longer than broad, length along midline 0.50 mm, maximum width 0.48 mm. Elytra transverse, length along suture 0.95 mm, maximum width 1.10 mm. Abdomen widest at tergite 1 ( IV), and narrowing apically; mid-length of dorsally exposed part 0.76 mm, maximum width 0.93 mm. Length of aedeagus ( Fig. 5E ) 0.33 mm; broad median lobe slightly constricted near middle.

Female. Unknown

Comparative notes. Sathytes obliquus is morphologically most similar to S. longitrabis Yin & Li in sharing the semi-membranous apophysis located at the apical half of antennomere 9, and antennomere 11 bearing single protuberance at the base. These two species can be separated by the much larger body of the new species (2.85 mm vs. 2.21 mm), and the protuberance of antennomere 11 is relatively much longer.

Distribution. China: Zhejiang.

Etymology. The specific name refers to the oblique antennomere 9 of the male.

Figures

FIGURE 5. Sathytes obliquus sp. nov., male. A. Dorsal habitus. B. Antennal club. C. Antennomere 9. D. Modification of antennomere 11, enlarged. E. Aedeagus, ventral. Scale bars: 0.5 mm in A; 0.2 mm in B; 0.1 mm in C, E; 0.02 mm in D.