Chydaeus belousovi, 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 : 14-16

Chydaeus belousovi sp. n.

( Figs 5 , 39–43 )

Type material. Holotype: ♂, China, “ CH, Yunnan Province, Mt. NW Mengku Town 23 40 39 N / 99 46 53 E 23 39 48 N / 99 46 10 E 2720–2825 m, 27.05.2010 Belousov I. & Kabak I. leg.” ( ZIN).

Paratypes: China. YUNNAN: 3 ♂, 3 ♀, same data as holotype (cBL&KB, ZIN, cJS, cWR); 1 ♀, “ CH, Yunnan Province, E sl. Daxueshan , W Niutoushan 24 0 7 31 N / 99 40 21 E 24 0 7 15 N / 99 39 12 E 2940–3375 m, 3.06.2010, Belousov I. & Kabak I. leg.” (cBL&KB); 1 ♂, “ China, Yunnan Province SSE Shuangjiang Town 23 22 22 N / 99 54 47 E, H = 2540 m, 22.06.2011, Belousov, Kabak, Korolev lg” ( ZIN).

Description. Dorsal habitus: Fig. 5 .

Size. Body length 8.7–9.5 mm, width 4.0– 4.3 mm; in holotype 8.8 and 4.1 mm, respectively.

Color. Body brownish black to almost black, shiny on dorsum; labrum, base of mandibles, very narrow lateral margins of pronotum and of elytra, occasionally also elytral suture paler, brown or reddish brown; palpi and antennae, usually also tibiae and tarsi light brown, femora brownish black.

Microsculpture. In both sexes present throughout on dorsum, consisting of fine isodiametric meshes on head and pronotum and of weakly transverse meshes on elytra; meshes on pronotum inside of basal angles slightly obliterate.

Head. Large (HWmax/PWmax = 0.68–0.69 and HWmin/PWmax = 0.58–0.61), with very sparse, indistinct micropunctation. Eyes small, moderately or weakly convex (HWmax/HWmin = 0.13–0.18). Tempora oblique or slightly convex, short, sloped to neck. Clypeus very shallowly emarginate and very vaguely bordered apically. Frontal foveae wide, shallow; clypeo-ocular prolongations short or only suggested. Clypeo-frontal suture thin and shallow. Supraorbital setigerous pores situated at level of slightly behind hind margin of eyes, removed rather far (at a distance of about five or six diameters of pore) on frons from supraorbital furrows. Labrum deeply emarginate apically. Left mandible at apex blunted, not truncate. Ligular sclerite narrow, not or only slightly widened anteriorly; truncate at apex. Antennae in both sexes not reaching to pronotal basal edge, with antennomeres 5 to 7 each about 1.6–1.8 times as long as wide.

Pronotum. Transverse (PWmax/PL = 1.48–1.57), widest at the end of the apical third, rather strongly narrowed basad (PWmax/PWmin = 1.26–1.32), with one lateral seta on each side in widest point. Sides rounded in anterior three-quarters and nearly straight or slightly sinuate in posterior quarter; lateral bead narrow, not widened basally. Apical margin noticeably emarginate, bordered only laterally. Basal margin rather shallowly emarginate medially, slightly oblique laterally, distinctly bordered throughout, as long as or scarcely longer than apical margin and distinctly shorter than elytral base between humeral angles. Apical angles less than 90°, markedly protruding anteriad, narrowly rounded at apices. Basal angles obtuse, each with a small obtuse denticle protruding laterad. Pronotal disc moderately convex apically, flattened basally, markedly sloped to apical angles. Lateral depressions narrow apically, about as wide as antennomere 2, widened behind lateral seta and disappearing in basal third. Basal foveae very shallow and wide, area at basal angles somewhat flat. Pronotal surface rather densely punctate along margins and very sparsely so or occasionally smooth in central portion; punctures very coarse and confluent in latero-basal areas.

Elytra. Moderately convex, oval, rounded at sides, rather wide and short [EL/EW = 1.22–1.31 (1.22–1.25 in male and 1.24–1.31 in female), EL/PL = 2.26–2.41 (2.26–2.38 in male and 2.27–2.41 in female), EW/PWmax = 1.21–1.25 (1.21–1.23 in male and 1.21–1.25 in female)], widest at middle, not fused along suture. Humeri subangulate, without denticle at apices. Subapical sinuations weak. Sutural angles acute, with apices blunt in both sexes. Basal borders slightly sinuate, joined each with lateral margin at very obtuse angle. Striae impunctate, slightly crenulate, weakly impressed basally (more distinctly so in male than in female) and nearly superficial apically. Parascutellar strioles short, at most as long as total width of intervals 1+2 basally; apices of parascutellar strioles free or connected with striae 1; basal setigerous pores present. Intervals nearly flat, rather wide at apex, very finely and sparsely micro-punctate. Umbilicate setal series distinctly interrupted at middle.

Hind wings reduced to very small stubs.

Ventral side. Prosternum finely and rather densely pubescent; prosternal process not projected posteriad. Proepisterna (propleura) indistinctly micro-punctate. Metepisterna ( Fig. 39 ) short, slightly wider than long, markedly narrowed posteriad. Sternum VII (last visible) in both sexes rounded at apex, with two pairs of setae.

Legs. Metacoxa each with or without additional posteromedial setigerous pore and with one or two additional medial setigerous pores. Tarsi glabrous dorsally, tarsomere 5 with three pairs of lateroventral setae. Metatarsi shorter than HWmin, with tarsomere 1 much longer than tarsomere 2, but shorter than tarsomeres 2+3. In male, protarsi moderately enlarged, but narrower than protibia at apical margin (tarsomere 2–4 much wider than long, tarsomere 1 about as long as wide) and tarsomeres 1–4 each with adhesive vestiture ventrally; mesotarsi weakly enlarged, noticeably narrower than mesotibia at apical margin (tarsomeres 1 and 2 longer than wide, tarsomere 3 about as long as wide, tarsomere 4 very small, wider than long, deeply concave apically) and tarsomeres 2 and 3 each with few adhesive scales apically.

Female genitalia ( Figs 40–41 ). Apical stylomere moderately wide in lateral aspect, arcuate in ventral aspect.

Aedeagus. Median lobe ( Figs 42–43 ) robust, bent just behind basal bulb, slightly convex on ventral side medially and somewhat flat before apex, very wide in dorsal aspect, with very short terminal lamella narrowly rounded at tip; apical capitulum absent. Apical orifice in dorsal position, very wide, prolonged to basal bulb. Internal sac with a few folded formations covered by tiny spines.

Etymology. This new species is named after our friend and colleague, the entomologist Igor A. Belousov (St. Petersburg), one of the collectors of the type series.

Comparative remarks. Within the kasaharai group, this new species is easily recognized by having the apex of the left mandible somewhat acute, not truncate, and the supraorbital setigerous pores removed rather far (at a distance of about five or six diameters of pore) on frons from the supraorbital furrows. The latter character is of particular importance for the discrimination of the new species because in most other examined congeners the supraorbital pores are located at a distance of about two or three, very rarely four, diameters of pore from the supraorbital furrows. Chydaeus belousovi sp. n. is most similar to C. shunichii Ito from the westernmost part of the Yunnan Province in having body comparatively wide and flat, tarsi glabrous dorsally and elytra impunctate; the new species is easily distinguished from the latter species, in addition to the mentioned features of shape of the left mandible and differing position of the supraorbital pores, by having body larger (8.7–9.5 mm versus 6.9–8.0 mm in C. shunichii ) and pronotum with much flatter base. The male genitalia of these two species are also different: the median lobe of C. belousovi sp. n. is much wider and possesses a much shorter terminal lamella.

Distribution. Known from south-western Yunnan, China.

Figures

FIGURES 1 – 6. Chydaeus, dorsal habitus (holotypes). 1, C. dissimilis sp. n.; 2, C. shaanxiensis sp. n.; 3, C. kabaki sp. n.; 4, C. weishanensis sp. n.; 5, C. belousovi sp. n.; 6, C. putaoensis sp. n. Scales = 2.0 mm.

FIGURES 39 – 43. Chydaeus belousovi sp. n. (39, 42 – 43, holotype; 40 – 41, paratype). 39, left metepisternum; 40, laterotergite IX and stylus; 41, stylus; 42 – 43, median lobe of aedeagus. 39 – 40, ventral aspect; 41 – 42, lateral aspect; 43, dorsal aspect. Scales: A = 0.5 mm (Figs 42 – 43), B = 1.0 mm (Figs 39 – 41).