Wumengius fengi, Tian & Huang & Jia, 2023

Tian, Mingyi, Huang, Sunbin & Jia, Xinyang, 2023, A contribution to cavernicolous beetle diversity of South China Karst: eight new genera and fourteen new species (Coleoptera: Carabidae: Trechini), Zootaxa 5243 (1), pp. 1-66 : 11-15

publication ID	https://doi.org/ 10.11646/zootaxa.5243.1.1
DOI	https://doi.org/10.5281/zenodo.7642370
persistent identifier	https://treatment.plazi.org/id/039587AD-BF32-FFA7-FF7F-409A23A6FE90
treatment provided by	Plazi
scientific name	Wumengius fengi
status	sp. nov.

Treatment

Wumengius fengi n. sp.

Figures 1d View FIGURE 1 , 5–7 View FIGURE 5 View FIGURE 6 View FIGURE 7

Material. Holotype male, 26.31 °N / 104.70 °E, 1435 m, the cave Da Dong near village Tuoluo, Hongguang , Duge , Liupanshui , Guizhou, 2019. VII. 6, Zegang Feng & Chen Zhang leg., in SCAU. GoogleMaps

Diagnosis. Anophthalmic, medium-sized cave beetle, with moderately elongated body and appendages, eyeless and depigmented; fore part (head plus prothorax) evidently shorter than elytra, surface glabrous.

Description. Length: 6.0 mm; width: 2.0 mm. Habitus as in Figure 5 View FIGURE 5 .

Body yellowish brown, but mouthparts palps and tarsi pale; moderately shiny and whole body glabrous though genae with a few setae and lateral margins of elytra covered with short setae; microsculptural engraved meshes more or less isodiametric on head, moderately transverse on pronotum and elytra; fore body much shorter than elytra, (HLm+PL) / EL = 0.71.

Head stout, slightly longer than wide, HLm/HW = 1.52, HLl/HW = 1.1; genae not evidently expanded, widest at about 1/3 of head from neck to apical margin of labrum; frons and vertex convex; clypeus transverse, quadrisetose; labrum transverse, frontal margin strongly bisinuate, and so there is a prominent median lobe, 6-setose; anterior supraorbital setiferous pores located at about middle and the posterior ones near neck constriction; labial suture invisible, mentum with a seta on each side of tooth which is much shorter than lateral lobes, basal fovea widely concave, with a seta on each side; ligula thick and short, adnated to paraglossae, 8-setose at apex; palps moderately elongated, glabrous except 2 nd labial palpomere which is unisetose on inner margin, and with an additional seta medially on outer margin and another on inner side of subapex; 2 nd labial palpomere 1.3 times as long as 3 rd, 3 rd maxillary palpomere 1.1 times as long as 4 th; suborbital pore present ( Figure 6A View FIGURE 6 ); antennae rather short and stout, pubescent from 2 nd antennomere; scape stouter, as long as pedicel, the 3 rd – 5 th longest, the comparative length of each antennomere from the 1 st to 11 th in holotype as: 1 st (1.00) / 2 nd (1.00) / 3 rd (1.40) / 4 th (1.40) / 5 th (1.35) / 6 th (1.35) / 7 th (1.30) / 8 th (1.20) / 9 th (1.10) / 10 th (1.00) / 11 th (1.40).

Pronotum almost as long as head including mandibles, much wider than head, PW/HW = 1.42; slightly wider than long, PW/PL =1.11; base and front straight, base slightly wider than front PbW/PfW = 1.10; lateral margin feebly bordered throughout, strongly and feebly contracted forwardly and backwardly respectively, nearly straight before hind angles; fore latero-marginal setae at about apical 2/9; disc moderately convex; median line well-defined, basal transversal impression and foveae well-marked. Scutellum small.

Elytra elongated and a little amygdaloid, much longer than wide, EL/EW = 1.72; much wider than pronotum, EW/PnW = 1.59; lateral sides finely bordered throughout, marginal gutters well-marked; disc moderately convex, depressed medially near base; striae fine, punctures of striae invisible, intervals slightly convex. Chaetotaxy ( Figure 6B View FIGURE 6 ): dorsal and preapical pores well marked, anterior and medial dorsal pores located on 3 rd stria, at about 2/9 and middle of elytra from base respectively; the preapical pore located at the apical anastomosis of 2 nd and 3 rd striae, and at about apical 1/6 of elytra, much closer to elytral suture than to apical margin; basal pore present; 4 th pore not backwardly shifted; 7 th, 8 th and apical pores distant from marginal gutter; the anguloapical pore present, closer to elytral margin than to suture.

Legs thin and slender, bearing setae or short pubescence; the 1 st tarsomere much shorter than 2 nd –4 th tarsomeres together in fore leg, whereas as long as and longer than those in middle and hind legs respectively.

Ventrites smooth, IV–VI each with two pairs of paramedial setae VII bisetose apically in male.

Male genitalia ( Figure 6C, D View FIGURE 6 ): The median lobe of aedeagus slender and moderately elongate, base small, slightly arcuate at middle, distinctly narrowed at apex, which is pointed and reflexed; endophallus armed with a small copulatory piece which is about 1/5 as long as the median lobe; in dorsal view the apical lobe widened, broadly rounded at apex; parameres much shorter than the median lobe, each bearing four long setae at apex.

Etymology. Named after Mr. Zegang Feng, an expert on Pseudoscorpions in Hebei University, Baoding, who collected the type specimen.

Distribution. China (Guizhou). Known only from the cave Da Dong in Shuicheng ( Figure 7 View FIGURE 7 ).

Da Dong is located in Tuoluo village, opening on a sub hill and with a large entrance. Inside this short cave there are some nice speleothems. A small underground stream runs through the main passage, which is wet in most parts. Unfortunately, the cave fauna is very poor.

In order to get more material, we visited this cave in July 2020 and searched carefully throughout the main passage but found nothing.