Sathytes tibialis 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 : 850-851

Sathytes tibialis Yin and Li , sp. nov.

( Figures 3L , 5F , 6H , 7L , 8L,P )

Type material

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

Paratypes. One male, same label data as holotype ; three females, same label data as holotype ; one male, labelled ‘ CHINA: Yunnan Prov. / Tengchong County / Datang / 9 May 2005 / Hao HUANG leg .’.

Description

Male. Body reddish brown, mouthparts and tarsi lighter; BL 1.78–1.92. Head ( Figure 3L ) wider than long, HL 0.38–0.39, HW 0.44–0.45. Vertexal foveae quite indistinct, anterior edge of foveae located at level of posterior margin of eyes; LE: LP = 1.23: 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 5F ) strongly clubbed; semi-membranous apophysis on antennomere IX as in Figure 7L ; antennomere X ( Figure 6H ) slightly wider than long, XI with two truncate basal protuberances, the more basal one covered with tufts of apical setae.

Pronotum slightly longer than wide, PL 0.47–0.48, PW 0.44–0.45. Protibiae ( Figure 8P ) strongly expanded mesally at middle. Elytra combined wider than long, EL 0.56–0.57, EW 0.72–0.73. Abdomen wider than long, AL 0.37–0.48, AW 0.64–0.68; tergite IV about twice as long as next. Length of aedeagus ( Figure 8L ) 0.18.

Female. Slightly larger than male; BL 2.07–2.12, HL 0.41–0.42, HW 0.46–0.47, PL 0.47–0.48, PW 0.47–0.48. Elytra combined wider than long, EL 0.57–0.61, EW 0.71–0.76, AL 0.62–0.66, AW 0.72–0.75. Eyes each comprises about 15 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 male expanded protibiae.

Remarks

This new species is placed near the group of species that have two basal protuberances of antennomere XI. Sathytes tibialis can be easily separated from all other Sathytes species by the male protibiae being expanded mesally at middle, coupled with its relatively elongate antennomere IX, short curved apophysis of antennomere IX located sub-basally and aedeagus being broad basally and dramatically narrowed from middle toward apex.

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.