Trechus chaklaensis, Schmidt, 2009

Schmidt, Joachim, 2009, Taxonomic and biogeographical review of the genus Trechus Clairville, 1806, from the Tibetan Himalaya and the southern central Tibetan Plateau (Coleoptera: Carabidae: Trechini) 2178, Zootaxa 2178 (1), pp. 1-72 : 56-57

The Trechus chaklaensis group

Diagnosis: Head with frontal furrows deep, +/- strongly curved at middle. Frons and supraorbital areas strongly convex. Temples smooth. Mandibles normal. Pronotum cordate, with hind angles well produced. Pronotal base +/- rectilinear in middle and with outer fifth more strongly curved anteriorly. Basal transverse depression of pronotum diffuse, limited towards disc; laterobasal foveae broadly developed. Pronotal median line distinct, deeper near base. Hind wings reduced to small stubs. Humerus broadly rounded. Each elytron with parascutellar seta, preapical seta and two discal setae on third interval, with anterior discal seta located on stria III at the end of the anterior elytral quarter, and with middle dorsal seta located on stria III somewhat behind elytral middle. Stria VIII slightly or moderately impressed from level of the fifth umbilicate pore backwards and more deeply impressed at levels of seventh and eighth pores. Recurrent elytral preapical sulcus deeply impressed and directed to the end of the fifth stria. Ventral surface smooth. Legs relatively short, with thick femora and thin tibia and tarsi; protibiae slightly dilated towards apices, hardly bowed, without a longitudinal groove on external surface. Two basal protarsi of male dilated, dentoid at the inner apical border. Aedeagal median lobe small, with basal bulb average and strongly bent downwards, and with basal velum well developed; in dorsal view more slender, in lateral view with terminal lamella straight and moderately short, not hooked at tip. Internal sac with a strongly sclerotized and sharply limited transverse fold (copulatory piece) in middle of third quarter of median lobe. Parameres rather stout, with left paramere slightly longer than right one, both with four setae at tip.

Species included: Monotypic: T. chaklaensis sp. n. ( South Central Tibet) .