Tangius glabellus Yin & Li

Yin, Zi-Wei, Li, Li-Zhen & Zhao, Mei-Jun, 2012, Contributions to the knowledge of the myrmecophilous pselaphines (Coleoptera, Staphylinidae, Pselaphinae) from China. I. Ta n g i u s glabellus gen. et sp. nov. from Tibet, Zootaxa 3397, pp. 55-61 : 56-58

Tangius glabellus Yin & Li , new species

( Figs. 1 –28)

Type material. Holotype: CHINA: 3, labeled ‘ China: Tibet / Motuo County / Hanmi / alt. 2,200 m, 19.viii.2005 / Liang Tang leg. // HOLOTYPE [red] / Tangius glabellus sp. n. / Yin & Li, det. 2012 / SNUC’. Paratypes: CHINA: 2Ƥ, same label data as the holotype, both bear the following label: ‘ PARATYPE [yellow] / Tangius glabellus / Yin & Li, det. 2012 / SNUC’.

Description. Male. Body length 3.2 mm. Head ( Fig. 4 ) slightly elongate, finely punctate; clypeus covered with sparse short setae; maxillary palpi ( Fig. 8 ) with palpomeres III–IV pubescent; antennae setose, gradually broader through entire length ( Fig. 6 ), with antennomeres II–X transverse, IX largest ( Fig. 7 ). Pronotum ( Fig. 2 ) glabrous, with fine punctation; area lateral and posterior to lateral antebasal foveae roughly sculptured. Elytra finely punctate ( Fig. 3 ), lacking pubescence, narrowed at base. Hind wings fully developed. Metaventrite ( Fig. 9 ) with posterior margin deeply notched medially. Legs glabrous except for tarsi and apical half of tibiae; protrochanters ( Figs. 11, 12 ) slightly protuberant at ventral margin; mesotibiae ( Fig. 14 ) with triangular apical projection at mesal margin; metatrochanters ( Fig. 16 ) with sharp ventral spine; all femora ( Figs. 10, 13, 15 ) with ring-shaped sulcus near base. Abdomen slightly wider than long; tergite IV ( Fig. 5 ) largest, tergite VIII ( Fig. 18 ) and sternite VII ( Fig. 17 ) transverse, apically covered with long setae. Aedeagus ( Figs. 19–21 ) asymmetric; median lobe broadened apically, with sharp needle-shaped spine at right side; dorsal lobe slender, apically curved rightward in dorsal view and ventrally in lateral view; lacking dorsal diaphragm; basal foramen large.

Female ( Fig. 1 ). Similar to male in general habitus. Body length 3.5 mm. Eyes smaller than in male. Tergite VIII ( Fig. 23 ) hemispheric; sternite VIII ( Fig. 22 ) transverse; genital sclerites as in Fig. 24 .

Distribution. China: Tibet (= Xizang Autonomous Region).

Etymology. The specific name refers to the nearly glabrous dorsal surface of the new species.

Host ant. Unknown.

Biology. The field trip to Motuo County by Liang Tang (August, 2005) was in rainy season, with a lot of rain every day. The beetles were found in the central part of a nest of ‘small and yellow ants’ ( Lasius ?) under a big fallen tree, in a typical subtropical evergreen broad-leaved forest. Since no ant specimens were collected, their identification is impossible.

Figures

FIGURE 1. Habitus of Tangius glabellus, female. Scale bar = 1.0 mm.

FIGURES 2 – 5. Details of Tangius glabellus, male. 2. Pronotum. 3. Right elytron. 4. Head. 5. Tergite IV.

FIGURES 6 – 16. Details of Tangius glabellus, male. 6. Right antenna. 7. Antennomeres IX – XI. 8. Left maxillary palpus. 9. Meso- and metaventrite. 10. Front leg. 11, 12. Protrochanter. 13. Middle leg. 14. Mesotibia. 15. Hind leg. 16. Metatrochanter. Scale bars: 12, 14, 16 = 0.1 mm.

FIGURES 17 – 24. Details of Tangius glabellus. 17. Male sternite VIII. 18. Male tergite VIII. 19. Aedeagus, in dorsal view. 20. Aedeagus, in lateral view. 21. Aedeagus, in ventral view. 22. Female sternite VIII. 23. Female tergite VIII. 24. Sclerites of female genitalia. Scale bars: 19 – 23 = 0.2 mm, 24 = 0.1 mm.