Sathytes longitrabis 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 : 843

Sathytes longitrabis Yin and Li , sp. nov.

( Figures 1A , 3D , 4D , 7D , 8D )

Type material

Holotype. Male, labelled ‘ CHINA: Shaanxi Prov. / Zhouzhi County / Houzhenzi / Qinling / Qinlingliangxia / N33.48.973 E107.44.483 // alt. 1820 m / 18 May 2008 / Hao HUANG and Wang XU leg.’.

Description

Male. Body ( Figure 1A ) reddish brown, mouthparts and tarsi lighter; BL 2.21. Head ( Figure 3D ) slightly wider than long, HL 0.43, HW 0.47. Vertexal foveae indistinct, anterior edge of foveae at level of posterior margin of eyes; LE: LP = 1.27: 1. Eyes moderately developed, prominent, each comprises about 20 facets. Antennae with scapes thick and large, pedicels longer than antennomeres III, III–VIII subequal, IX–XI ( Figure 4D ) strongly clubbed, IX ( Figure 7D ) much longer than wide, X much wider than long, XI with single basal protuberance covered with tuft of long apical setae.

Pronotum slightly longer than wide, PL 0.55, PW 0.46. Elytra combined wider than long, EL 0.74, EW 0.89. Abdomen wider than long, AL 0.49, AW 0.78; tergite IV 2.5 times as long as next. Length of aedeagus ( Figure 8D ) 0.17.

Female. Unknown.

Habitat and distribution

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

Etymology

The specific name is combined from two Latin stems: “ long ”, meaning “elongate” and “ trab ”, meaning club, referring to the elongate male antennomere IX.

Remarks

The elongate and nearly cylindrical antennomere IX of the new species is shared only with S. clavatus , S. oculatus and S. tangliangi . Sathytes tangliangi is remotely related and placed in the group of species near S. montanus . Sathytes longitrabis can be separated from the remaining two by apophysis of antennomere IX being located apicomesally, while the apophysis of both S. clavatus and S. oculatus is located posterior to the middle. Sexual modification of antennomere XI in S. longitrabis is formed by a single short protuberance, whereas in S. clavatus it is formed by a small blade-like piece and in S. oculatus by a short curved semi-membranous apophysis.

Figures

Figure 1. Dorsal habitus of Sathytes spp. (A) Sathytes longitrabis; (B) Sathytes paulus.

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.