Chydaeus weishanensis, 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 : 12-13

Chydaeus weishanensis sp. n.

( Figs 4 , 32–38 )

Type material. Holotype: ♂, China “YUNNAN 2000–2800m 25.11N 100.24E WEIBAOSHAN mts. W slope 25– 28/6.92 Vít. Kubáň leg.”, “COLL. WRASE BERLIN” (cWR).

Paratypes: 1 ♀, China “ YUNNAN 1800–2500 m 25.10N 100.21E WEISHAN mt. 1992 D. Král lgt. 22–25./6” ( NHMB); 1 ♀, “ CHINA (Yunnan) Dali Bai Auton. Pref ., Wuliang Shan , 9 km SW Weishan, 2450–2500 m, 25°10'14"N / 100°14'22"E (W. slope, sec. oak/pine for., pasture, und. stones) 13.VI.2007 D.W.Wrase [35]”, “ Chydaeus spec. 2 Wrase det. 2012” (cWR).

Description. Dorsal habitus: Fig. 4 .

Size. Body length 8.2–9.0 mm, width 3.9–4.2 mm; in holotype 9.0 and 4.2 mm, respectively.

Morphological characters as described for C. kabaki sp. n. except as follows:

Color. Body black or dark brown, slightly shiny on dorsum, with very narrow lateral margins of pronotum and elytra, occasionally also with epipleurae of elytra reddish brown; palpi and antennae unicolorous, light brown; legs brown or dark brown, usually with darker femora and paler tarsi.

Microsculpture. Head with dorsal microsculpture markedly obliterate in male and more distinct, consisting of very fine isodiametric meshes in female. Pronotum in male with microsculpture markedly obliterate, almost indistinct; in female with microsculpture consisting of fine isodiametric meshes along sides and of obliterate, weakly transverse meshes on remaining surface. Elytra in male with isodiametric meshes in narrow area along base and on two lateral intervals throughout and with weakly transverse meshes on remaining surface, meshes on intervals 1 to 5 basally rather strongly obliterate; in female elytral microsculpture distinct throughout, consisting of isodiametric meshes in basal half and on two or three lateral intervals throughout and of weakly transverse meshes on remaining surface.

Head. Comparatively large (HWmax/PWmax = 0.68–0.70 and HWmin/PWmax = 0.59–0.61), finely punctate either throughout or only laterally, with small, moderately convex eyes (HWmax/HWmin = 0.12–0.18). Supraorbital setigerous pores located at level of hind margin of eyes, removed on frons at a distance of about three diameters of pore from supraorbital furrows.

Pronotum. Narrower and with wider base than in C. kabaki sp. n. (PWmax/PL = 1.42–1.49; PWmax/PWmin = 1.19–1.23); basal margin nearly straight medially, slightly oblique laterally; basal angles slightly more than 90°. Pronotal disc more convex, with extremely narrow lateral depressions reaching pronotal basal edge.

Elytra. Slightly more convex than in C. kabaki sp. n. [EL/EW = 1.25–1.34 (1.26–1.34 in male and 1.25 in female), EL/PL = 2.25–2.29 (2.27–2.29 in male and 2.25 in female), EW/PWmax = 1.20–1.22 (1.20–1.22 in male and 1.22 in female)], with obtuser inner humeral angle ( Fig. 33 ). Parascutellar strioles about as long as total width of intervals 1+2 basally, apices of parascutellar strioles free, not connected with striae 1. All intervals basally and apically, and intervals 5 to 9 or 7 and 8 almost throughout minutely punctate.

Ventral side. Metepisterna ( Fig. 32 ) more strongly narrowed posteriad than in C. kabaki sp. n.

Legs. Metacoxae without additional posteromedial setigerous pores and without additional medial setigerous or unsetigerous pores. Tarsomere 5 with three or four pairs of lateroventral setae.

Female genitalia ( Figs 37–38 ). Apical stylomere comparatively wide in lateral aspect, arcuate in ventral aspect.

Aedeagus. Median lobe (34–35) more robust than in C. kabaki sp. n.; terminal lamella shorter and wider, distinctly curved ventrad, with sides more strongly converging posteriad ( Fig. 36 ); internal sac with two elongate spiny patches: a longer one on right side and a shorter one on left side.

Etymology. The specific name refers to Weishan, a mountain in the Chinese province Yunnan, where the type series was collected.

Comparative remarks. Very similar to C. kabaki sp. n. in most characters including the male genitalia, but distinctly differs from the latter species in having the pronotum narrower, inner humeral angle obtuser, median lobe of the aedeagus with shorter and wider terminal lamella, and internal sac with two elongate spiny patches instead of one present in C. kabaki sp. n. The females of two these species are additionally distinguished from each other by the features of elytral microsculpture on intervals 2–8 apically, which consists of slightly transverse meshes in C. weishanensis sp. n. and of nearly isodiametric meshes in C. kabaki sp. n. Chydaeus weishanensis sp. n. easily differs from C. kasaharai and C. shaanxiensis sp. n. in having tarsi glabrous dorsally, elytra impunctate at least in middle portions of internal intervals and pronotal lateral bead not widened basally. Like C. kabaki sp. n., C. weishanensis sp. n. is distinguished from C. shunichii and C. fugongensis by having the pronotum larger, narrower and more convex, the metacoxae without additional setigerous pores, and the median lobe of aedeagus slenderer, curved ventrad at apex and with different armature in the internal sac.

Distribution. This new species is known from the Weishan mountain range in the northern part of the Wuliang Shan, 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 32 – 38. Chydaeus weishanensis sp. n. (32 – 36, holotype; 37 – 38, paratype). 32, left metepisternum; 33, humeral part of left elytron; 34 – 35, median lobe of aedeagus; 36, terminal lamella of median lobe; 37, laterotergite IX and stylus; 38, stylus. 32, 37, ventral aspect; 33, 35 – 36, dorsal aspect; 34, 38, lateral aspect. Scales: A = 0.5 mm (Fig. 36), B = 1.0 mm (Figs 32 – 35, 37 – 38).