Chydaeus kabaki, 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 : 9-12

Chydaeus kabaki sp. n.

( Figs 3 , 23–31 )

Type material. Holotype: ♂, China “CH, S Sichuan, S Yanyuan 27 22 0 1 N / 101 30 17 E 27 21 0 4 N / 101 30 33 E 2825–3290 m, 29.06.2010 Belousov I. & Kabak I. leg.” ( ZIN).

Paratypes: 2 ♂, 2 ♀, same data as holotype (cBL&KB; ZIN); 2 ♂, 2 ♀, same as above, but “ 27 21 34 N / 101 30 25 E 27 21 0 4 N / 101 30 33 E 3035–3290 m ” (cBL&KB; ZIN); 2 ♂, “ CHINA S Sichuan 20 km S Muli (Bowa) 27.45N 101.13E 3500 m M. Bocak lgt. 29.vi.1998 ” (cWR).

Description. Dorsal habitus: Fig. 3 .

Size. Body length 8.0–10.0 mm, width 4.7–5.7 mm; in holotype 9.2 and 5.2 mm, respectively.

Color. Body black, shiny on dorsum, in most specimens base of mandibles and labrum paler; palpi light brown yellow; antennae brown, with antennomeres 1–3 usually more or less infuscate; legs brown or dark brown, often femora almost black and tarsi brownish yellow.

Microsculpture. Head in both sexes with very fine, almost isodiametric meshes under and behind eyes; occasionally strongly obliterate, indistinct meshes recognized also on clypeus and frons. Pronotum with microsculpture very fine, strongly obliterate, consisting of mixture of isodiametric and weakly transverse meshes. Elytra with distinct microsculpture present throughout, consisting in male of isodiametric meshes along base and of weakly transverse meshes on remaining surface, in female microsculpture consisting largely of more or less isodiametric meshes, with weakly transverse meshes on interval 1.

Head. Comparatively large (HWmax/PWmax = 0.68–0.72 and HWmin/PWmax = 0.59–0.64), very finely punctate, with distances between punctures greater than their diameters; punctation obliterate or absent in medial portions of clypeus, frons and vertex. Eyes comparatively small, moderately convex (HWmax/HWmin = 0.12– 0.19). Tempora oblique, flat or occasionally slightly convex, sloped to neck. Clypeus slightly emarginate, in most specimens vaguely bordered apically. Frontal foveae small, shallow; clypeo-ocular prolongations short, often only suggested. Clypeo-frontal suture slightly impressed. Supraorbital setigerous pores located at level of hind margin of eyes, removed on frons at a distance of about two diameters of pore from supraorbital furrows. Labrum markedly emarginate apically. Left mandible truncate at apex. Ligular sclerite narrow, truncate or somewhat rounded at apex, with apical angles slightly protruding laterad. Antennae in male reaching to pronotal basal edge, in female shorter, reaching to pronotal basal quarter; in both sexes with antennomeres 5 to 7 each about 1.6–1.8 times as long as wide.

Pronotum. Transverse (PWmax/PL = 1.52–1.59), widest at the beginning of the second third or slightly before middle, noticeably narrowed basad (PWmax/PWmin = 1.22–1.28). Sides largely rounded, slightly sinuate just at basal angles, each with one setigerous pore at about third from apical angle; lateral bead narrow, almost not widened posteriad. Apical margin shallowly emarginate, bordered only laterally. Basal margin nearly straight or slightly emarginate, distinctly bordered throughout, slightly longer than apical margin and slightly shorter than elytral base between humeral angles. Apical angles slightly less than 90° (lateral aspect), slightly protruding anteriad, narrowly rounded at apices. Basal angles right or acute, sharp at apices. Pronotal disc moderately convex, weakly flattened basally, markedly sloped to apical angles and less so to basal angles. Lateral depressions very narrow, almost not or only slightly widened in basal half, occasionally disappearing in basal third. Basal foveae somewhat small and shallow, in some specimens slightly deepened, area at basal angles slightly convex. Pronotal surface rather coarsely and densely punctate along margins and very finely so in central portion; punctures coarsest and confluent in and around basal foveae.

Elytra. Convex, oval, rounded at sides, comparatively wide and short [EL/EW = 1.24–1.29 (1.25–1.29 in male and 1.24–1.25 in female), EL/PL = 2.24–2.40 (2.23–2.40 in male and 2.24–2.35 in female), EW/PWmax = 1.14– 1.21 (1.14–1.18 in male and 1.15–1.21 in female)], widest at middle, not fused along suture. Humeri angulate, without denticle at apices. Subapical sinuations distinct, not deep. Sutural angles not separated from each other medially, slightly less than 90°, with apices blunted at both sexes. Basal borders nearly straight, evenly arched anteriad laterally, joined each with lateral margin at sharp, obtuse angle ( Fig. 31 ). Striae impunctate, slightly crenulate, impressed along entire length but rather shallowly so just at apex. Parascutellar strioles present, shorter than total width of intervals 1+2 basally; apices of parascutellar strioles connected with striae 1; basal setigerous pores present. Intervals on disc slightly convex, flattened and rather wide at apex, in most specimens impunctate or in some specimens two lateral intervals with indistinct, sparse micro-punctation. Umbilicate setal series distinctly interrupted at middle.

Hind wings reduced to very small stubs.

Ventral side. Prosternum glabrous; prosternal process not projected posteriad. Proepisterna (propleura) very indistinctly, vaguely punctate. Metepisterna ( Fig. 25 ) short, slightly wider than long, markedly narrowed posterad. Sternum VII (last visible) in both sexes rounded at apex, with two pairs of setae.

Legs. Metacoxae without additional medial setigerous or nonsetigerous pores, with (in specimens from Muli environs) or without (in specimens from Yanyuan environs) additional posteromedial setigerous pores. Tarsi glabrous dorsally, tarsomere 5 with four (occasionally three or five) pairs of lateroventral setae. Metatarsi shorter than HWmin, with tarsomere 1 longer than tarsomere 2, but shorter than tarsomeres 2+3. In males, protarsi markedly enlarged, narrower than protibia at apical margin (tarsomere 2–4 much wider than long, tarsomere 1 about as long as wide, and tarsomeres 1–4 with adhesive vestiture ventrally); mesotarsi enlarged less strongly than protarsi, about as wide as mesotibia at apex (tarsomere 1 slightly longer than wide; tarsomere 2 about as long as wide, tarsomere 3 wider than long, tarsomere 4 distinctly smaller than tarsomeres 2 and 3, deeply concave apically), tarsomeres 2–4 with adhesive vestiture ventrally, but tarsomere 4 only with few adhesive scales apically.

Female genitalia ( Figs 26–27 ). Apical stylomere comparatively wide and moderately curved.

Aedeagus. Median lobe ( Figs 24, 28, 29–30 ) slender, bent ventrad between middle and basal bulb, somewhat convex on ventral side. Terminal lamella in dorsal aspect rather narrow, much longer than wide, narrowly rounded at apex, with sides evenly converging posteriad ( Fig. 23 ); apex in lateral aspect curved ventrad. Apical orifice slightly shifted to the left, prolonged to basal bulb. Internal sac with long, narrow and winding spiny patch in basal half of median lobe.

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

Comparative remarks. Chydaeus kabaki sp. n. is similar to the two preceding species in habitus and in many structural characters including metepisterna slightly wider than long, elytral parascutellar strioles comparatively short, parascutellar setigerous pores present and median lobe of aedeagus lacking apical capitulum. Based on these characters, this new species should also be included in the kasaharai group. Chydaeus kabaki sp. n. distinctly differs from C. kasaharai and C. shaanxiensis sp. n. in having the following distinctive features: head medially and elytra impunctate, elytral striae smoother, pronotal sides only slightly sinuate just before basal angles, inner humeral angles obtuser, tarsi glabrous on dorsal side and aedeagus with terminal lamella longer and curved ventrad at apex; the structure of the internal sac of C. kabaki sp. n. with long winding spiny patch is very distinct from that of C. kasaharai and C. shaanxiensis sp. n. Chydaeus kabaki sp. n. is distinguished from C. shunichii and C. fugongensis by having pronotum comparatively larger, narrower and more convex, and median lobe of aedeagus slenderer, curved ventrad at apex and with different armature of the internal sac.

Distribution. This new species is known from southern Sichuan, 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 23–31. Chydaeus kabaki sp. n. (23, 25, 28, 30–31, holotype; 24, 26–27, 29, paratypes). 23, terminal lamella of median lobe; 24, 28–30, median lobe of aedeagus; 25, left metepisternum; 26, stylus; 27, laterotergite IX and stylus; 31, 23, 29–31, dorsal aspect; 24, 26, 28, lateral aspect; 25, 27, ventral aspect. Scales: A = 0.5 mm (Fig. 23), B = 1.0 mm (Figs 24–31).