Chydaeus ganeshensis, 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 : 18-21

Chydaeus ganeshensis sp. n.

( Figs 49 , 53–55 )

Type material. Holotype: ♂, “ NEPAL Ganesh Himal Sundung Danda 27–2850m 24–25.IV.2008 lg. Hirthe/Jäger ca 28°03'07N 85°04'37” (cJS).

Paratypes: 1 ♀, same data as holotype (cJS); 4 ♀, " NEPAL Ganesh Himal Pasamcho Danda 2700m 28°03'34,2N 85°05'23,3E 26.IV.07 lg. Hirthe & Jäger " (cJS, ZIN); 1 ♀, “ NEPAL Ganesh Himal SE-slope 11.6.2000 Rupchet 35–3600 m ”, “Expedition Iman Ghalé, Santos Tamang, Ram, Santa & Santé Gurung” ( ZIN); 1 ♀, “ NEPAL Ganesh Himal W-slope Pangsang Bhanjyang 25–2700m, 3.V.08 lg. Hirthe & Jäger, ca 28°09'52N 85°07'39” (cJS).

Description. Dorsal habitus: Fig. 49 .

Size. Body length 5.7–6.2 mm, width 2.6–2.8 mm; in holotype 5.7 and 2.6 mm, respectively.

Color. Brownish black, shiny on dorsum; palpi, antennae, knees and tarsi brown; femora and tibiae almost black.

Microsculpture. Head with isodiametric microsculpture; meshes in female distinct throughout, in male distinct under and behind eyes and obliterate on remaining surface. Pronotum in male with microsculpture consisting of fine isodiametric meshes along sides and of more or less obliterate, weakly transverse meshes on remaining surface; in female with microsculpture consisting throughout of distinct, more or less isodiametric meshes. Elytral microsculpture in both sexes consisting of isodiametric meshes in narrow area along basal borders and on two lateral intervals and of weakly transverse meshes on remaining surface; meshes in male fine, somewhat obliterate, in female distinct.

Head. Comparatively large (HWmax/PWmax = 0.71–0.72 and HWmin/PWmax = 0.61–0.63), impunctate. Eyes small, weakly convex (HWmax/HWmin = 0.10–0.19). Tempora short, oblique, sloped to neck. Clypeus shallowly emarginate. Frontal foveae small, deepened; clypeo-ocular prolongations very short, usually only suggested. Clypeo-frontal suture very shallow, superficial. Supraorbital setigerous pore located at level of just behind hind margin of eyes, removed at a distance of about two diameters of pore from supraorbital furrows. Labrum shallowly emarginate apically. Apex of left mandible not truncate, only slightly blunted. Ligular sclerite almost not widened apically, truncate at apex. Antennae surpassing pronotal basal edge by approximately one apical antennomere, with narrow antennomeres 2 to 4 and rather wide (about 1.3–1.6 times as long as wide) antennomeres 5 to 10.

Pronotum. Transverse (PWmax/PL = 1.41–1.50), widest at beginning of second third, markedly narrowed basad (PWmax/PWmin = 1.20–1.26). Sides gently rounded anteriorly, distinctly sinuate in basal third, each with one setigerous pore in widest point; lateral bead not widened basally. Apical margin rather shallowly emarginate, bordered only laterally. Basal border nearly straight, at most somewhat rounded just at basal angles, distinctly bordered throughout, about as long as apical margin and noticeably shorter than elytral base between humeral angles. Apical angles acute, slightly protruded anteriad, blunt at apices. Basal angles right or obtuse, rather sharp at apices, without denticles. Pronotal disc moderately convex, slightly sloped towards basal angles and markedly so towards apical angles. Lateral furrows narrow up to basal angles, lateral depressions absent. Basal foveae small, oval or somewhat elongate, not deep, separated from lateral furrows and basal pronotal margin by convexities. Area between basal foveae slightly convex. Base of pronotum irregularly and vaguely punctate.

Elytra. Convex, oval, rounded at sides, comparatively wide [EL/EW = 1.31–1.34 (1.34 in male and 1.31–1.32 in female), EL/PL = 2.55–2.74 (2.55 in male and 2.74 in female), EW/PWmax = 1.35–1.42 (1.35 in male and 1.39– 1.42 in female)], widest at middle, fused along suture. Humeri subangulate, each with traces of an obtuse denticle at apex. Sutural angles less than 90°, with apices rather sharp in both sexes. Basal borders nearly straight medially, slightly curved anteriad laterally, joined each with lateral margins at very obtuse angle. Striae impunctate, slightly crenulate, slightly impressed on disc, superficial and slightly evanescent at apex. Parascutellar strioles absent or rudimentary, parascutellar pore absent. Intervals impunctate, very slightly convex basally and flat apically. Umbilicate setal series widely interrupted at middle, consisting of five basal and eight or nine apical setae.

Hind wings reduced to very small stubs.

Ventral side. Prosternum covered with short setae anteriorly; prosternal process not projected posteriad. Proepisterna (propleura) nearly smooth, at most vaguely micro-punctate anteriorly. Metepisterna ( Fig. 54 ) transverse, markedly wider than long, somewhat narrowed posteriad. Sternum VII (last visible) in both sexes with two pairs of setae along apical margin and rounded at apex.

Legs. Metacoxae each with an additional posteromedial setigerous pore and with an additional unsetigerous fovea medially. Tarsi glabrous dorsally, tarsomere 5 with two pairs of lateroventral setae. Metatarsi shorter than HWmin, with tarsomere 1 about equal in length to tarsomeres 2+3. In male, protarsi markedly enlarged, but narrower than protibia at apex (tarsomere 1 about as long as wide, tarsomeres 2–4 very short, much wider than long), and tarsomeres 1–4 with adhesive vestiture ventrally; mesotarsi weakly enlarged, narrower than mesotibia at apex (tarsomeres 1 and 2 longer than wide and tarsomeres 3 and 4 about as long as wide), and tarsomeres 2 and 3 with adhesive vestiture ventrally.

Female genitalia ( Fig. 55 ). Laterotergite IX very small, transverse; apical stylomere short and wide.

Aedeagus. Median lobe ( Fig. 53 ) bent ventrad behind basal bulb, slightly curved dorsad just at apex, with sides rounded in medial portion and markedly converging in apical portion. Terminal lamella very short, obtuse at apex, without apical capitulum. Apical orifice in dorsal position, prolonged to basal bulb. Internal sac without any distinct sclerotized elements.

Etymology. The specific name refers to the Ganesh Himal, a mountain range in Central Nepal, where the type series was collected.

Comparative remarks. Based on characters of external morphology and structure of male genitalia, C. ganeshensis sp. n. is very close to C. minimus Kataev & Schmidt described from the Manaslu Himal, Central Nepal. The new species differs from the latter one in the following distinctive features: clypeo-frontal suture shallower, superficial, pronotal lateral depressions absent even at basal angles, elytra wider, and metacoxae each with an oval unsetigerous fovea medially. Additionally, the male of the new species is distinguished from that of C. minimus by having the protarsomeres shorter, the mesotarsomeres 2 and 3 with adhesive vestiture ventrally and the median lobe of aedeagus with a more acute apex.

Distribution. This new species seems to be endemic to the Ganesh Himal, Central Nepal. Judging from the morphological similarity and the apparently allopatric distributions of C. ganeshensis sp. n. and C. minimus , this new species seems to be a geographical vicariant of the latter.

Figures

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 53–63. Chydaeus. 53–55, C. ganeshensis sp. n.; 56 – 63, C. chuliensis sp. n. (53–54, 56–61, holotypes; 55, 62–63, paratypes). 53, 57–58, median lobe of aedeagus; 54, 59, left metepisternum; 55, 62, laterotergite IX and stylus; 56, terminal lamella of median lobe; 60, protarsus; 61, mesotarsus; 63, stylus. 53, 56, 58, 60–61, dorsal aspect; 54–55, 59, 62, ventral aspect; 57, 63, lateral aspect. Scales: A = 0.5 mm (Figs 53, 55–56), B = 1.0 mm (Figs 54, 57–63).