Sathytes similis 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 : 393-394

Sathytes similis Shen & Yin , sp. nov.

( Fig. 6 )

Type material (7 exx). HOLOTYPE: CHINA : ♂, ‘ China: W. Jiangxi, Yichun City, Mingyueshan National Park (OiRNJDzë ḢDZ) , 27°35’32–46”N, 114°17’13”–16’40”E, path in mixed forest, grass, leaf litter, sifted, 1200–1600 m, 12.vii.2013, Song, Yin, Yu leg.’ ( SNUC) . PARATYPE: CHINA : 1 ♀, same label data as holotype ( SNUC) ; 1 ♂, ‘ China: W. Jiangxi, Pingxiang City, Wugongshan National Park (ǨṁƜOiẎĿDz), 27°27’55”N, 114°09’58”E, broad leaf, sifted, 1000–1350 m, 20.vii.2013, Song, Yin, Yu leg.’( SNUC) ; 2 ♀♀, same label data except for ‘cable way station to Dian-jiang-tai (ĕ"â), 27°27’39”N, 114°10’03”E, 1340–1400 m, 19.vii.2013 ’ ( SNUC) ; 1 ♀, ‘Chi- na: W. Jiangxi, Ji’an City (ṅkhv), Jinggang Shan, Shuikou , 26°32’42”N, 114°08’03”E, mixed leaf litter, sifted, 790–900 m, 30.vii.2014, Chen, Hu, Lü & Yu leg. ’; China: S. Zhejiang, Longquan City, Fengyang Shan, Da-Tianping , 27°54’36”N, 119°10’20”E, bush leaf, moss, ferns, sifted & beating, 1320 m, 27.iv.2014, Peng, Song, Yan, Yin & Yu leg.’ ( SNUC) .

Diagnostic description. Male. Body ( Fig. 6A ) dark reddish-brown, mouthparts and tarsi paler. Body length 1.95–2.10 mm. Head moderately wider than long, length from anterior margin of clypeus to base 0.36–0.39 mm, width across eyes 0.44–0.47 mm. Each eye composed of about 20 facets. Length of eyes (0.14 mm) / length of tempora (0.09 mm) approximately 1.6:1. Length of antennae 1.01–1.04 mm; club ( Fig. 6B ) formed by antennomeres 9–11; antennomere 9 ( Fig. 6C ) slightly transverse, semi-membranous apophysis at nearly upper half on mesal surface; antennomere 10 strongly transverse, obconical; antennomere 11 ( Fig. 6B ) about 1.9 times as long as wide, with two truncate basal protuberances, the more basal one covered with two tufts of specialized setae at apex ( Fig. 6D ). Pronotum slightly longer than wide, length along midline 0.45–0.51 mm, maximum width 0.43–0.49 mm. Elytra transverse, length along suture 0.61–0.68 mm, maximum width 0.76–0.77 mm. Abdomen widest at tergite 1 ( IV), and narrowing apically; mid-length of dorsally exposed part 0.48–0.54 mm, maximum width 0.66–0.68 mm. Length of aedeagus ( Fig. 6E ) 0.25 mm; median lobe almost symmetric.

Female. Similar to male in size. Body length 1.98–2.03 mm. Head slightly wider than long, length from anterior margin of clypeus to base 0.42–0.43 mm, width across eyes 0.45–0.46 mm. Each eye composed of about 20 facets. Length of eyes (0.12 mm) / length of tempora (0.05 mm) 2.4:1. Length of antennae 0.89–0.93 mm. Pronotum slightly longer than wide, length along midline 0.46–0.49 mm, maximum width 0.44–0.47 mm. Elytra moderately transverse, length along suture 0.58–0.62 mm, maximum width 0.75–0.76 mm. Abdomen widest at tergite 1 ( IV), and narrowing apically; mid-length of dorsally exposed part 0.53–0.58 mm, maximum width 0.71–0.73 mm.

Comparative notes. Sathytes similis is morphologically close to S. paulus Yin & Li and S. wuyishanus Yin & Li in the form of antennomeres 9 and 11, and may be separated from both by the much larger body size (1.95–2.10 mm vs. 1.59–1.66 mm of S. paulus , and 1.54 mm of S. wuyishanus ), and the relatively more transverse antennomere 2 in relation to antennomere 3.

Distribution. China: Zhejiang, Jiangxi.

Etymology. The new specific epithet ‘ similis ’ refers to the morphological similarity between the new species and its congeners.

Figures

FIGURE6. Sathytes similis sp. nov., male (A. population of Jiangxi. B–E. population of Zhejiang). 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.