Sathytes perpusillus Yin and Li, 2012

Yin, Zi-Wei, Li, Li-Zhen & Zhao, Mei-Jun, 2012, Taxonomic study on Sathytes Westwood (Coleoptera: Staphylinidae: Pselaphinae) from China. Part I, Journal of Natural History 46 (13 - 14), pp. 831-857 : 847-848

Sathytes perpusillus Yin and Li , sp. nov.

( Figures 3H , 5B , 6F , 7H , 8H )

Type material

Holotype. Male, labelled ‘ CHINA: Yunnan Prov. / Nabanhe N. R. / Benggangxinzhai / alt. 1750 m / Jia-Yao HU and Zi-Wei YIN leg.’.

Paratypes. Two males, same label data, but ‘ Bengganghani / alt. 1900 m / 1 May 2009 ’; one female , same label data, but ‘ Nanmugahe / alt. 1650 m, 30 April 2009 ’; one female , same label data, but ‘ Shanshenmiao / alt. 1700 m / 29 April 2009 ’; one female , same label data, but ‘ Benggangxinzhai / alt. 1750 m, 3 May 2008 ’; five females , labelled ‘ CHINA: Yunnan Prov. / Gongshan County / Qiqi , alt. 1900 m / 2 July 2010 / Liang TANG leg .’.

Description

Male. Body reddish brown, mouthparts and tarsi lighter; BL 1.48–1.52. Head ( Figure 3H ) wider than long, HL 0.30–0.31, HW 0.36–0.37. Vertexal foveae indistinct, posterior edge of foveae located at level of posterior margin of eyes; LE: LP = 1.75: 1. Eyes well-developed, prominent, each comprises about 20 facets. Antennae with scapes thick and large; pedicels larger than antennomeres III, III–IV subequal in width, V–VI subequal in width, slightly wider than IV, VII–VIII subequal in width, slightly wider than VI, IX–XI ( Figure 5B ) strongly clubbed; semi-membranous apophysis on antennomere IX as in Figure 7H ; antennomere X much wider than long, XI ( Figure 6F ) with two small blunt basal protuberances sparsely covered with long apical setae.

Pronotum about as long as wide, PL 0.36–0.37, PW 0.37–0.39. Elytra combined much wider than long, EL 0.43–0.44, EW 0.60–0.61. Abdomen wider than long, AL 0.39–0.40, AW 0.54–0.56; tergite IV twice as long as next. Length of aedeagus ( Figure 8H ) 0.17.

Female. Similar to male in size: BL 1.47–1.58, HL 0.29–0.32, HW 0.34–0.36, PL 0.35–0.37, PW 0.34–0.38. Elytra combined wider than long, EL 0.37–0.42, EW 0.55–0.60, AL 0.46–0.47, AW 0.51–0.59. Eyes each comprises about 10 facets.

Habitat and distribution

Sifted from the mixed leaf litter of a broad-leaved forest. Southwest China (Yunnan).

Etymology

The specific name refers to the small body size.

Remarks

The new species is placed closest to S. minutus and S. excavatus by sharing the protuberances of antennomere XI being small, and the more basal protuberance lacking tuft of setae. It can be separated by the larger size, elytra each with four basal foveae and the apophysis of antennomere IX being long and located basally. While S. minutus is distinctive within the genus by elytra possessing three basal foveae, coupled with the small body size and the apophysis of antennomere IX located subapically. Sathytes excavatus is best separated by the lower protuberance of antennomere XI with two large apical setae and being longer than the more apical one.

Figures

Figure 3. Head (left half) of Sathytes spp. (A) Sathytes cristatus; (B) Sathytes excertus; (C) Sathytes larinus; (D) Sathytes longitrabis; (E) Sathytes longwangshanus; (F) Sathytes magnus; (G) Sathytes paulus; (H) Sathytes perpusillus; (I) Sathytes rarus; (J) Sathytes sichuanicus; (K) Sathytes tangliangi; (L) Sathytes tibialis; (M) Sathytes usitatus; (N) Sathytes wuyishanus; (O) Sathytes yunnanicus. Scale bars 0.2 mm.

Figure 5. Antennomeres VIII–XI of Sathytes spp. (A) Sathytes paulus; (B) Sathytes perpusillus; (C) Sathytes rarus; (D) Sathytes sichuanicus; (E) Sathytes tangliangi; (F) Sathytes tibialis. Scale bars 0.2 mm.

Figure 6. Details of Sathytes spp. (A–C) antennomeres VIII–XI; (D–J) antennomere IX, enlarged; (A) Sathytes usitatus; (B) Sathytes wuyishanus; (C) Sathytes yunnanicus; (D) Sathytes cristatus; (E) Sathytes paulus; (F) Sathytes perpusillus; (G) Sathytes rarus; (H) Sathytes tibialis; (I) Sathytes wuyishanus; (J) Sathytes yunnanicus. Scale bars: A–C 0.2 mm; D–J 0.05 mm.

Figure 7. Antennomere IX of Sathytes spp. (A) Sathytes cristatus; (B) Sathytes excertus; (C) Sathytes larinus; (D) Sathytes longitrabis; (E) Sathytes longwangshanus; (F) Sathytes magnus; (G) Sathytes paulus; (H) Sathytes perpusillus; (I) Sathytes rarus; (J) Sathytes sichuanicus; (K) Sathytes tangliangi; (L) Sathytes tibialis; (M) Sathytes usitatus; (N) Sathytes wuyishanus; (O) Sathytes yunnanicus. Scale bars 0.2 mm.

Figure 8. Details of Sathytes spp. (A–O) aedeagus; (P) protibia; (A) Sathytes cristatus; (B) Sathytes excertus; (C) Sathytes larinus; (D) Sathytes longitrabis; (E) Sathytes longwangshanus; (F) Sathytes magnus; (G) Sathytes paulus; (H) Sathytes perpusillus; (I) Sathytes rarus; (J) Sathytes sichuanicus; (K) Sathytes tangliangi; (L, P) Sathytes tibialis; (M) Sathytes usitatus; (N) Sathytes wuyishanus; (O) Sathytes yunnanicus. Scale bars 0.1 mm.