Sathytes excertus 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 : 838-842

Sathytes excertus Yin and Li , sp. nov.

( Figures 3B , 4B , 7B , 8B )

Type material

Holotype. Male, labelled ‘ CHINA: Yunnan Prov. / Gongshan County / Qiqi , alt. 1900 m / 2 July 2010 / Liang TANG leg.’.

Paratypes. Three females, same label data as holotype.

Description

Male. Body reddish brown, mouthparts and tarsi lighter; BL 2.07. Head ( Figure 3B ) wider than long, HL 0.37, HW 0.44. Vertexal foveae large and distinct, posterior edge of foveae located anterior to level of posterior margin of eyes; LE: LP = 2.14: 1. Eyes well-developed, prominent, each comprises about 20 facets. Antennae with scapes thick and large, pedicels larger than antennomeres III, III longer than but as same width as IV, IV–VI subequal in length and width, VII–VIII subequal in width, slightly wider than IV–VI, IX–XI ( Figure 4B ) strongly clubbed; membranous apophysis on antennomere IX as in Figure 7B ; antennomere X much wider than long; XI with conspicuously long basal protuberance covered by tuft of long apical setae.

Pronotum about as long as wide, PL 0.44, PW 0.42. Elytra combined longer than wide, EL 0.79, EW 0.73. Abdomen wider than long, AL 0.47, AW 0.65; tergite IV nearly three times as long as next. Length of aedeagus ( Figure 8B ) 0.22.

Female. Similar to male in size: BL 1.97–2.03, HL 0.37–0.38, HW 0.45–0.47, PL 0.46–0.47, PW 0.45–0.47. Elytra combined wider than long, EL 0.61–0.62, EW 0.71–0.73, AL 0.53–0.56, AW 0.69–0.70. Eyes comprise about 12 facets each.

Habitat and distribution

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

Etymology

The specific name is derived from the unique form of antennomere XI in the male.

Remarks

The new species is similar to S. appendiculatus in sharing the strongly laterally protruding basal protuberance of the antennomere XI. It can be readily separated by

antennomere XI having a single basal protuberance while there are two in S. appendiculatus , and the structure of the protuberance is completely different.

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 4. Antennomeres VIII–XI of Sathytes spp. (A) Sathytes cristatus; (B) Sathytes excertus; (C) Sathytes larinus; (D) Sathytes longitrabis; (E) Sathytes longwangshanus; (F) Sathytes magnus. Scale bars 0.2 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.