Chydaeus wuliangensis, Kataev, Boris M., Wrase, David W. & Schmidt, Joachim, 2014

Kataev, Boris M., Wrase, David W. & Schmidt, Joachim, 2014, New species of the genus Chydaeus from China, Nepal, Myanmar, and Thailand, with remarks on species previously described (Coleoptera: Carabidae: Harpalini), Zootaxa 3765 (1), pp. 1-28 : 22-24

Chydaeus wuliangensis sp. n.

( Figs 51 , 64–65 , 70)

Type material. Holotype: ♂, “ CHINA (Yunnan) Lincang Pref ., Wuliang Shan , old pass road, W-side, 2200 m 24°42'58.6"N / 100°29'52.0"E (small creek valley with primary forest remnant, in leaf litter) 16.IX.2009 D.W.Wrase [47B]”, “ Chydaeus spec. 1 Wrase det. 2012”, “Coll. Wrase BERLIN ” (cWR).

Description (male holotype only). Dorsal habitus: Fig. 51 .

Size. Body length 9.6 mm, width 4.3 mm.

Color. Black, shiny on dorsum; mandibles basally, outer margins of labrum and clypeus, palpi, antennae, tibiae and tarsi reddish brown, femora blackish brown; apices of tibiae infuscate.

Microsculpture. Head dorsally with strongly obliterate, almost indistinct microsculpture. Pronotum with microsculpture consisting of slightly transverse meshes, strongly obliterate on disc and more distinct along sides. Elytral microsculpture consisting of distinct, almost isodiametric meshes along basal borders and of slightly transverse meshes on remaining surface, distinct along sides and in apical third and obliterate on inner intervals basally.

Head. Comparatively large (HWmax/PWmax = 0.70 and HWmin/PWmax = 0.62), covered almost throughout with sparse micropunctures. Eyes small, moderately convex (HWmax/HWmin = 1.13). Temporae moderately long, slightly convex, sloped to neck. Clypeus convex, very shallowly emarginate, rather distinctly bordered apically. Clypeo-frontal suture distinctly deepened. Frontal foveae small, somewhat deep; clypeo-ocular prolongations thin, reaching supraorbital furrows, very superficial at eyes. Supraorbital setae located at level of just behind hind margin of each eye, removed on frons at a distance of about three diameters of pore from supraorbital furrows. Labrum markedly emarginate apically. Left mandible distinctly truncate at apex. Ligular sclerite subtruncate at apex, with apical angles slightly protruding laterally, Antennae short, extended to basal quarter of pronotum, with antennomeres 5 to 7 each about 1.4–1.5 times as long as wide.

Pronotum. Moderately transverse (PWmax/PL = 1.44), widest at beginning of second third, markedly narrowed basad (PWmax/PWmin = 1.35). Sides rounded along entire length, each with one setigerous pore in widest point of pronotum; lateral bead very narrow, not widened posteriad. Apical margin very shallowly emarginate, bordered only laterally. Basal margin very broadly rounded medially, slightly oblique laterally, distinctly bordered along entire length, as long as apical margin and markedly shorter than elytral base between humeral angles. Apical angles slightly less than 90° (lateral aspect), slightly protruding anteriad, narrowly rounded at apices. Basal angles obtuse, each with a small obtuse denticle at apex. Pronotal disc convex, markedly sloped to apical angles and slightly so to basal angles. Lateral depressions extremely narrow apically, slightly widened behind lateral setae and reaching pronotal base. Basal foveae small and moderately deep, areas at basal angles between basal foveae and lateral depressions convex. Pronotal surface punctate rather coarsely and densely along base and very finely along sides and at apex; punctation in central portion extremely fine and sparse.

Elytra. Convex, rounded at sides, moderately wide (EL/EW = 1.38, EL/PL = 2.46, EW/PWmax = 1.23), widest at middle. Humeri angulate, each with a tiny acute denticle visible from behind. Subapical sinuations moderately deep. Sutural angles slightly less than 90°, with blunted apices. Basal borders slightly sinuate, joined each with lateral margin at very obtuse angle. Striae impunctate, slightly crenulate, impressed in basal three-quarters and superficial in apical quarter. Parascutellar strioles and basal setigerous pores present. Intervals flat at apex and slightly convex in remaining portion. All intervals with very fine, sparse micropunctation. Umbilicate setal series almost continuous, with very narrow gap at middle.

Hind wings reduced to very small stubs.

Ventral side. Prosternum covered with fine setae medially; prosternal process not projected posteriad. Proepisterna (propleura) smooth. Metepisterna ( Fig. 64 ) approximately as long as wide, markedly narrowed posteriad. Sternum VII (last visible) rounded at apex, with two pairs of setae along apical margin.

Legs. Metacoxae each without posteromedial setigerous pore or any additional setigerous or nonsetigerous foveae medially. Tarsi glabrous dorsally, tarsomere 5 with three or occasionally four pairs of lateroventral setae. Metatarsi shorter than HWmin, with tarsomere 1 slightly shorter than tarsomeres 2+3. Protarsi (in male) markedly enlarged, but slightly narrower than protibia at apex (tarsomeres 2–4 much wider than long); mesotarsi much narrower than protarsi (tarsomere 1 longer than wide; tarsomere 2 about as long as wide; tarsomere 3 slightly wider than long; and tarsomere 4 much smaller than tarsomeres 2 and 3, and deeply concave apically); protarsomeres 1– 4 and mesotarsomeres 2–4 with adhesive vestiture ventrally.

Aedeagus. Median lobe ( Fig. 65 ) arcuate in lateral aspect, convex on ventral side medially, with triangular terminal lamella directed ventrad. Apical capitulum very small, slightly prominent ventrad and slightly more so dorsad; dorsal flange of apical capitulum situated more distally than its ventral flange. Apical orifice slightly shifted to the right, prolonged to basal bulb. Internal sac with sclerotized elements at middle of median lobe: with two small elongate spiny patches ventrally and with one larger spiny patch on left side.

Etymology. The specific name refers to the Wuliang Shan, a mountain range in Yunnan, China, where the holotype was collected.

Comparative remarks. Based on characters of external morphology and shape and structure of aedeagus, this new species is very close to C. asetosus Kataev & Kavanaugh described from the northern part of the Gaoligong Shan (several localities within Fugong County) in the northwestern portion of Yunnan Province, China. Chydaeus wuliangensis sp. n. is easily discriminated from the latter species by having a seta on each side of pronotum, which is absent in C. asetosus , and additionally by the following distinctive characters: clypeo-frontal suture and frontal foveae deeper, antennae shorter, elytral intervals superficial, not impressed in apical quarter, umbilicate setal series almost continuous, pro- and mesotarsi in male less strongly enlarged, and metatarsi slenderer. The shape of the median lobe of the aedeagus is almost the same as in C. asetosus , but the armature of the internal sac is quite different: two small elongate spiny patches ventro-medially and one larger spiny patch on left side medially; in contrast, the internal sac of C. asetosus has two basal and usually one medial spiny patches; medial spiny patch, if present, located on right side of medial lobe. In habitus and external characters including a seta on pronotal sides, C. wuliangensis sp. n. is very similar to four other species from Yunnan ( C. baoshanensis Kataev & Liang , C. satoi Ito , C. convexus Ito and C. malaisei Kataev & Schmidt ), but is markedly distinguished from them in having the pronotum more strongly narrowed basad, the clypeo-frontal suture deeper, and the mesotarsi of male less strongly enlarged. In addition, the shape and structure of the median lobe of the aedeagus in all these species are quite different from those of the new species; further, sternum VII (last visible) in males of C. satoi , C. convexus and C. malaisei is distinctly truncate at apex as opposed to that of C. wuliangensis sp. n., which is rounded.

Distribution. Known only from the northern part of Wuliang Shan, western Yunnan, China ( Fig. 70 ).

Figures

FIGURE 70. Map of Yunnan Province (China), illustrating localities for the Chydaeus convexus species subgroup.

FIGURES 49 – 52. Chydaeus, dorsal habitus (holotypes). 49, C. ganeshensis sp. n.; 50, C. chuliensis sp. n.; 51, C. wuliangensis sp. n.; 52, C. luxiensis sp. n. Scales = 2.0 mm.

FIGURES 64–69. Chydaeus. 64–65, C. wuliangensis sp. n. (holotype); 66–69, C. luxiensis sp. n. (66, 69, holotype; 67–68, paratype). 64, 66, left metepisternum; 65, 69, median lobe of aedeagus; 67, laterotergite IX and stylus; 68, stylus. 64, 66–67, ventral aspect; 65, 68–69, lateral aspect. Scale = 1.0 mm.