Chydaeus putaoensis, 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 : 16-18

Chydaeus putaoensis sp. n.

( Figs 6 , 44–48 )

Type material. Holotype: ♂, " N BURMA leg Reuter ca. 60 km NW Putao 2200mNN, 7+ 12.8.2006 " (cJS).

Paratypes: 2 ♂, 5 ♀, same data as holotype (cJS, cWR, ZIN).

Description. Dorsal habitus: Fig. 6 .

Size. Body length 9.0– 9.8 mm, width 4.4–4.9 mm; in holotype 9.1 and 4.4 mm, respectively.

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

Color. Generally slightly darker, often antennomeres partly, tibiae at least apically, tarsi throughout and occasionally also palpi somewhat infuscate.

Microsculpture. Elytra in both sexes with distinct microsculpture consisting of isodiametric meshes along basal border and along sides, also on intervals 8 and 9, and of weakly transverse meshes on remaining surface.

Head. Comparatively large (HWmax/PWmax = 0.65–0.69 and HWmin/PWmax = 0.57–0.61), more convex on clypeus and frons than in C. belousovi sp. n., with deeper frontal foveae and clypeo-frontal suture. Eyes (HWmax/ HWmin = 0.10–0.19) slightly smaller. Labrum more shallowly emarginate apically. Antennae longer, in male surpassing pronotal basal margin by approximately one apical antennomere, in female only reaching to pronotal basal edge; in both sexes with antennomeres 5 to 7 each about 2.0–2.3 times as long as wide.

Pronotum. More transverse (PWmax/PL = 1.56–1.65), widest at beginning of second third, with slightly wider base (PWmax/PWmin = 1.19–1.25) than in C. belousovi sp. n.; basal margin noticeably wider than apical margin. Sides usually more distinctly sinuate in posterior quarter. Basal angles less obtuse, slightly more than 90°, lacking denticle at apex. Lateral depressions usually discernible from apical angles to basal margin. Basal foveae deeper and narrower, reaching pronotal basal margin; area at basal angles between basal foveae and lateral depressions somewhat convex. Pronotal surface rather densely punctate along margins; punctures coarsest and confluent laterobasally.

Elytra. Wider and shorter [EL/EW = 1.20–1.29 (1.26–1.27 in male and 1.20–1.29 in female), EL/PL = 2.55– 2.66 (2.55–2.60 in male and 2.57–2.66 in female), EW/PWmax = 1.26–1.34 (1.26–1.29 in male and 1.26–1.34 in female)], fused along suture, each with a tiny humeral denticle at apex visible from behind. Basal borders slightly more markedly sinuate laterally, joined each with lateral margin at more distinct obtuse angle. In males striae slightly more impressed and intervals on disc slightly more convex than in males of C. belousovi sp. n. Parascutellar basal setigerous pores absent.

Ventral side. Metepisterna ( Fig. 44 ) transverse, noticeably wider than long.

Hind wings reduced to very small stubs.

Legs. Metacoxa each with additional posteromedial setigerous pore and without additional medial setigerous or unsetigerous pores. Tarsomere 5 with two, occasionally three pairs of lateroventral setae. Metatarsi in male about as long as and in female slightly shorter than HWmin. In male, protarsi markedly enlarged, with tarsomere 2 only slightly narrower than protibia at apical margin (tarsomeres 1–4 with adhesive vestiture ventrally); mesotarsi moderately enlarged, narrower than mesotibia at apical margin, with tarsomeres 2 and 3 about as long as wide and with adhesive vestiture ventrally.

Female genitalia ( Figs 47–48 ). Apical stylomere rather strongly widened in middle portion in lateral aspect, somewhat curved in ventral aspect.

Aedeagus. Median lobe ( Figs 45–46 ) robust, but narrower in dorsal aspect than in C. belousovi sp. n., with relatively smaller basal bulb; ventral side convex up to apex; terminal lamella markedly curved dorsad. Internal sac with several folded formations covered by tiny spines.

Etymology. The specific name refers to Putao, a city in Myanmar, in which mountainous environment the type series was collected.

Comparative remarks. This new species is very similar and apparently closely related to C. belousovi sp. n. described above. Both the species share many morphological features, including an almost acute, only slightly blunted apex of left mandible and an unusual position of the supraorbital setigerous pores which are removed rather far from the supraorbital furrows. Chydaeus putaoensis sp. n. distinctly differs from C. belousovi sp. n. in having the antennae longer, the frontal foveae deeper, the pronotum and elytra wider, the parascutellar setigerous pore absent, the pro- and mesotarsi in male more enlarged, and the median lobe of the aedeagus with apex distinctly curved dorsad. Additional distinctive features of C. putaoensis sp. n. are listed in the description. Although we tentatively include this new species in the kasaharai group, in fact it is morphologically and geographically intermediate between this less specialized group of species distributed in China and the more specialized irvinei species group which is adapted to the high altitude environments of the Himalaya. Like all members of the irvinei species group, C. putaoensis sp. n. lacks a parascutellar setigerous pore; however, this new species has a parascutellar striole which is present in all members of the kasaharai species group and absent or only suggested in the members of the irvinei group. Interestingly, C. putaoensis sp. n. shares some characters with some species of the irvinei group (for example, C. ovalipennis Kataev & Schmidt and C. minimus Kataev & Schmidt ) which are unknown outside the irvinei group: elytra fused along suture, tarsomere 5 usually with two pairs of lateroventral setae and apex of left mandible not truncate, only slightly blunted (the latter character is also present in C.

belousovi sp. n. of the kasaharai group). Both C. ovalipennis and C. minimus differ from C. putaoensis sp. n. in having the body smaller (5.5–7.6 mm), the parascutellar striole absent or rudimentary and the supraorbital setigerous pore on head situated at a distance of about two or three diameters of pore from supraorbital furrows.

Distribution. Known only from the type locality (about 60 km north-west of Putao, 2200 m), in the northernmost part of the Kachin State, Myanmar.

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 44 – 48. Chydaeus putaoensis sp. n. (44 – 46, holotype; 47 – 48, paratype). 44, left metepisternum; 45 – 46, median lobe of aedeagus; 47, laterotergite IX and stylus; 48, stylus. 44, 47, ventral aspect; 45, 48, lateral aspect; 46, dorsal aspect. Scale = 1.0 mm.