Sathytes usitatus 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 : 851-852

Sathytes usitatus Yin and Li , sp. nov.

( Figures 3M , 6A , 7M , 8M )

Type material

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

Paratypes. 27 males, same label data as holotype type; 25 females, same label data as holotype ; one male, two females, same label data as holotype , but ‘alt. ca. 2000 m / 25 May 2009 / Jian-Qing ZHU leg.’.

Description

Male. Body reddish brown, mouthparts and tarsi lighter; BL 2.23–2.42. Head ( Figure 3M ) slightly wider than long, HL 0.43–0.49, HW 0.47–0.49. Vertexal foveae quite indistinct, anterior edge of foveae located about level of posterior margin of eyes; LE: LP = 1: 1. Eyes well developed, prominent, each comprises about 20 facets. Antennae with scapes thick and large; pedicels larger than antennomeres III. III–V subequal in width. VI–VIII subequal in width, slightly narrower than VI. IX–XI ( Figure 6A ) strongly clubbed; semi-membranous apophysis on antennomere IX as in Figure 7M ; antennomere X wider than long. XI with single blunt basal protuberance with tuft of specialized setae at apex.

Pronotum about as long as wide, PL 0.53–0.56, PW 0.54–0.55. Elytra combined wider than long, EL 0.69–0.73, EW 0.85–0.86. Abdomen wider than long, AL 0.58–0.64, AW 0.76–0.77; tergite IV about 2.6 times as long as next. Length of aedeagus ( Figure 8M ) 0.19.

Female. Slightly bigger than male; BL 2.30–2.40, HL 0.47–0.49, HW 0.48–0.52, PL 0.50–0.51, PW 0.50–0.52. Elytra combined wider than long, EL 0.61–0.65, EW 0.81–0.85, AL 0.72–0.75, AW 0.76–0.85. Eyes each comprises about 15 facets.

Habitat and distribution

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

Etymology

The specific name indicates that it is a common species.

Remarks

Sathytes usitatus has single basal protuberance on antennomere XI. This species is similar to S. larinus by sharing the broad antennomere XI. It may be best separated by the basal protuberance of antennomere XI being longer, the apophysis of antennomere IX being longer and more slender and located anterior to the middle, and less broad aedeagus.

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 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.