Dianotrechus gueorguievi Tian

Tian, Mingyi, Huang, Sunbin, Wang, Xinhui & Tang, Mingruo, 2016, Contributions to the knowledge of subterranean trechine beetles in southern China's karsts: five new genera (Insecta, Coleoptera, Carabidae, Trechinae), ZooKeys 564, pp. 121-156 : 130-133

Taxon classification Animalia Coleoptera Carabidae

Dianotrechus gueorguievi Tian sp. n.

Holotype.

Female, labeled "China, Yunnan Province, Ermu Vill., Kunming District, Dashi Dong (Big Rock Cave), 24°49'13"N / 102°27'56"E, 1940 m in altitude, XI-8-2011, B. Petrov leg.", in SCAU.

Diagnosis.

A small, stout, yellowish brown beetle which is densely pubescent, with short fore body and appendages, convex head, not tumid propleura which invisible from above, rather flat elytra and coarsely punctate elytral striae.

Description.

Length: 3.1 mm (including mandibles), width: 0.9 mm. Habitus as in Fig. 7

Whole body yellowish brown, with palps pale; head and pronotum shiny, elytra dim; frons and vertex glabrous, genae with several short hairs, pronotum with a few fine setae, whole elytra covered with erect setae, these being as long as those on genae; underside generally glabrous, smooth and polished, but a few short hairs present on ventrites II and IV, and in lateral areas of prosternum; microsculptural meshes vanishing on head and pronotum, densely and moderately engraved on elytra. Fore part of body much shorter than elytra, EL/(HLm+PnL) = 1.39.

Head short and stout, much longer than wide (including mandibles), HLm/HW = 1.44, or as long as wide (excluding mandibles), genae broadly convex, frons and vertex moderately convex, frontal furrows entire, strongly divergent backwards; both supra-orbital pores closely located, posterior ones almost on frontal furrows, distance between anterior and posterior pores shorter than that between supra-orbital furrows at the closest point, neck short and broad; clypeus 4-setose, labrum transverse, nearly straight at frontal margin, 6-setose; mandibles rather short; labial suture missing; mentum 4-setose (two laterally and two at base of mental tooth); mentum tooth simple, very short, broad at apex; basal emargination wide and rather deep; ligula small and short, adnated to paraglossae, widened at apex, 6-setose; palps stout and short, penultimate joints much stouter than apical ones; 3rd maxillary palpomere slightly longer than 4th, labial palpomere 2nd distinctly longer than 3rd, bisetose at inner margin, with two additional setae in outer apical parts; 3rd maxillary palpomere with two tiny setae near apex; suborbital pores present, located in median portion of ventral genae, lying far from base of head; antennae short and stout, wholly pubescent, 1st antennomere stouter than others, 1st, 2nd and 4th-10th subequal in length, 3rd slightly longer than 2nd, but slightly shorter than 11th.

Prothorax: propleura not tumid, invisible from above; pronotum transverse, PnL/PnW = 0.84, wider than head, PnW/HW = 1.27, much shorter than head (including mandibles), HLm/PnL = 1.44, or as long as head (excluding mandibles); disc moderately convex; widest at about middle where lateral sides slightly expanded but remaining nearly parallel-sided, reflexed near hind angles; fore lateromarginal seta located at a little before middle, basal one a little before hind angle; fore angles rounded, basal ones rectangular and pointed; base as wide as front; front almost straight, base nearly straight medially, obtusely sinuate near hind angles; median line fine and well-defined, reaching front margin, but ending before basal transverse impression, the latter being distinctly marked and connected to basal foveae; front transverse impression unclear. Scutellum small and short.

Elytra elongate, slender, moderately convex, wider than pronotum, almost twice as long as wide, EL/EW =1.93, widest at about middle of elytra, gently narrowed towards base and subapex; base wide, shoulders rounded, prehumeral angles missing; apex of each elytron rounded; disc moderately convex, striae coarsely punctate, intervals slightly convex; 1st-4th striae and apical striae well-marked, 1st-3rd striae complete, 4th finished at level before median dorsal pore; other striae wanting; basal pore present, lying near basal margin and on side of scutellum; both dorsal pores located on 4th intervals, at about basal third and a little behind the middle of elytra, respectively, pre-apical pore located at apical fusion of 2nd and 3rd striae, level to ending point of apical stria, about twice as far from apex as from suture; marginal umbilicate series with 1st, 2nd, 6th and apical pores close to marginal gutter, 2nd-4th pores equidistant, but 1st more isolated; 5th pore widely removed away from 6th and closer to 4th pore.

Legs moderately long, covered with dense and short hairs; protarsi short, 1st tarsomere not distinctly wider than others, longer than 2nd and 3rd combined, but shorter than 2nd-4th combined; meso- and metatarsi longer, 1st tarsomere as long as 2nd-4th combined, respectively. Ventrites IV-VI each with a pair of paramedian setae, ventrite VII in female with three pairs of setae.

Male: Unknown.

Etymology.

In honour of Dr. Borislav V. Guéorguiev (National Museum of Natural History, Sofia, Bulgaria), an expert in Carabidae .

Distribution.

China (Yunnan) (Fig. 5a). Known only from the limestone Cave Dashi Dong in a western suburb of Kunming City (Fig. 8 A–C).

Dashi Dong is located more than 1 km away from Ermu Village, Xianjie Zhen, Anning, Kunming. The opening of this cave is 27 m wide and 17 m high. Its total length is 1394 m and the total depth is 39.30 m. The temperature in the dark parts is 21 °C. The unique beetle was collected in the dark area. In order to find more specimens of this interesting beetle, we visited this cave three times in July 2014, July 2015 and August 2015, but of no avail.