Selatosomus huanghaoi Qiu, 2018

Qiu, Lu, 2018, A new species of Selatosomus Stephens and the occurrence of Pristilophus melancholicus (Fabricius) in China (Coleoptera: Elateridae: Dendrometrinae), Zootaxa 4418 (6), pp. 588-593 : 589-590

Selatosomus huanghaoi Qiu , new species

( Figs. 1–2 ; 4 A)

Chinese common name: 黄氏金叩甲

Type material. Holotype: male, China: Yunnan: Tuguan Village [土官村], Xiaozhongdian Town [小中甸镇], Shangri-la City [香格里拉市], Diqing Tibetan Autonomous Prefecture [迪庆藏族自治州], 2800m, 26.IV.2015, Hao Huang leg. ( SWU) . Paratype: 1 male, same data as holotype ( SNUC) .

Diagnosis. This species can be distinguished from the majority of other Selatosomus species by less convex body, sparse pubescence and smaller pronotum. It may be confused with Selatosomus nanpingensis Schimmel, Tarnawski, Han et Platia, 2015 by the purple sheen of the body, but it can be readily distinguished from the latter by the following characteristics: 1) antennomere 3 is 1.8 times longer than antennomere 2, while antennomere 3 is 2.7 times longer than antennomere 2 in S. nanpingensis ; 2) pronotum and elytra with pubescence very short and sparse, invisible to the naked eye, while pubescence denser and clearly visible to the naked eye in S. nanpingensis ; 3) pronotum with hind angles short, lateral sides slightly arched, and interspaces between punctures on pronotal disc flat and smooth, while pronotum with hind angles long, lateral sides much more arched, and interspaces between punctures wrinkled in S. nanpingensis ; 4) elytra surface smooth, while elytra surface coarsely punctured in S. nanpingensis ; 5) apical portion of paramere thick, while apical portion of paramere thin, hook part smaller in S. nanpingensis .

Description. Male holotype ( Figs. 1 A–C ). Body length 16.7 mm, body width (elytral width) 5.9 mm, elytral length 11.0 mm, pronotal length 4.1 mm (measured along midline), pronotal width 4.3 mm (measured along midline), antennal length 5.0 mm. Ground color of body brownish black; dorsal surface with strong metallic violet sheen (observed in a diffuser), the violet sheen particularly lustrous on elytra; ventral surface with dark blue metallic sheen; claws brownish yellow. Pubescence yellowish white, very fine and short, invisible to the naked eye. Body somewhat flat ( Fig. 1 B ), pronotal length 0.43 times elytra length, as wide as the base of elytra.

Head: declined from base to apex, vertex with a very shallow V-shaped depression, surface in front of depression wrinkled. Intervals between punctures about 0.5–2.0 times their diameter. Frontal region with lateral sides ridged above antennae, medially declined. Eyes small, globular. Antenna ( Fig. 2 F , basal part) not exceeding hind angles of pronotum, short by about the length of last antennomere; antennomeres narrower towards apex. Antennomere 1 elongate oval shaped; antennomere 2 short, apically enlarged, as long as wide at apex; antennomere 3 about 1.75 times longer than wide, 1.8 times longer than antennomere 2, 0.85 times as long as antennomere 4; antennomere 4 elongate and triangular; antennomeres 5–8 distinctly pentagon-shaped, antennomeres 9–10 triangular, antennomere 11 with apex blunt. Mandible bidentate, the inner margin of the apical tooth with a small convex process. Apical palpomere of maxilla small, triangular. Labrum transverse, anterior margin convex, with several long setae.

Thorax: pronotum almost as wide as long, surface somewhat flat. Lateral sides of pronotum carinate; anterior margin thoroughly pubescent, outline slightly sinuate; lateral sides slightly convex; hind angles ( Fig. 2 E ) slightly divergent, distinctly carinated, apex blunt. Surface of pronotum with indistinct pubescence; punctures small and shallow, denser laterad ( Figs. 2 I –J ; disc with interspaces between punctures about 2–4 times their diameter; laterally with interspaces between punctures about 0.5–1 times their diameter), interspaces between punctures smooth and flat. Middle of pronotum with an impunctate line extending from base to apex, base medially with small depression reflecting greenish blue sheen ( Fig. 2 J ).

Hypomeron flat, densely punctate and pubescent; prosternal sutures straight; prosternum with deep greenish blue reflection, medially with sparse punctures and pubescence, impunctate posteriorly; prosternal collar with two depressions; prosternal process ( Fig. 2 K ) very large, convex ventrally, in lateral view, surface with large punctures, apex blunt.

Scutellar shield ( Fig. 2 G ) quadrate, base straight, apex bluntly protruded, lateral margins linear, parallel.

Elytra ( Fig. 2 L ) not arched, surface smooth and shining, with many fine grain-like impressions, pubescence indistinct; striae not deep, punctures of the striae small, with strial punctures spaced about 1–3 times their diameter; interstriae slightly elevated, smooth, punctures between striae very small, shallow and sparse. Elytra widening from base to middle (widest in 3/5 from the base).

Legs slender, tarsi simple, tarsomeres 1 to 4 becoming gradually shorter, tarsomere 5 the longest, tarsomere 4 the shortest. Metacoxal plate shape as Fig. 2 H , lateral ca. 1/3 distinctly narrowed.

Abdomen: dark blue metallic, finely punctured and pubescent. Tergite VIII ( Fig. 2 B ) nearly trapezoid, narrower towards apex, margins with long setae; basal margin obtuse-angularly emarginated, lateral corners round at base; lateral margins linear; apex truncated, lateral corners blunt at apex. Tergite IX ( Fig. 2 C ) short, medially widely and deeply emarginated, paired apices long-setose ( Fig. 2 C ). Tergite X ( Fig. 2 C ) stout, apex rounded. Sternite IX ( Fig. 2 A ) oval, with apex obtusely angled, distal portion pubescent.

Genitalia ( Fig. 2 D ): penis longer than parameres, robust basally, distal portion distinctly narrowed, apex bluntly rounded; paramere robust, the outer margin slightly convex from base to about half of length, distal portion concave, hook sharp, apex of paramere round.

Male paratype ( Fig. 1 D ). Similar to holotype, smaller (body length 14.8 mm), the metallic reflection not strong purplish, but mixed with light green and purplish red.

Female and larva. Unknown.

Distribution. China (northern Yunnan) ( Fig. 4 A ).

Natural history. Unknown.

Etymology. Named after the collector, the Chinese butterfly and stag beetle expert Mr. Hao Huang.

Figures

FIGURE 1. A–D. Habitus of Selatosomus huanghaoi Qiu, new species, holotype: A. dorsal view; B. lateral view; C. ventral view.Paratype:D. dorsal view.Scale bar 2 mm for all.

FIGURE2. A–L. Features of Selatosomus huanghaoiQiu, new species, holotype:A.sternite IX, ventral view; B.tergite VIII, dorsal view; C. tergite IX–X, dorsal view; D. aedeagus, ventral view; E. hind angle of pronotum; F. antennomeres 1–6; G. scutellar shield; H. left metacoxal plate; I. left portion of pronotum; J. middle portion of pronotum; K. prosternal process, lateral view; L. surface of left elytron.Scale bars 1 mm.

FIGURE 4. A–B. Distribution maps: A. Selatosomus huanghaoi Qiu, new species in Yunnan; B. recorded localities of Pristilophus melancholicus in China.