Ochthebius (Asiobates) sihotealiniensis Zinchenko, 2018

Zinchenko, V. K., 2018, Beetles of the subgenus Asiobates Thompson, 1859 (Ochthebius Laech, 1815, Coleoptera: Hydraenidae) of the Russian Far East, Far Eastern Entomologist 368, pp. 20-24 : 21-22

Ochthebius (Asiobates) sihotealiniensis Zinchenko , sp. n.

Figs 1, 3–6

MATERIAL. Holotype – ♂, Russia: Khabarovsk Province, Botchinsky Nature Reserve ,

cordon Komarov Kluch, 48°15.7' N, 139°25.5' E, h~ 200 m, 21.VI 2016, R. Yu. & А. Yu .

Dudko, E. R. Dudko. Paratypes: idem, 6–7.VII 2016, 1 ♂, 2 ♀, R. Yu. & E. R. Dudko .

dorsal view; 3–6 – aedeagus: 3 – left lateral view; 4 – right lateral view; 5 – ventral view; 6 –

dorsal view; O. lurugossus: 2 – habitus, dorsal view; 7–8 – aedeagus: 7 – left lateral view; 8

– dorsal view. Scale bars 0.5 mm (1–2); 0.2 mm (3–8).

DESCRIPTION. MALE ( Fig. 1 ). Length 1.95 mm. Body black-brown, antennal palpae and legs dark brown.

Labrum distinctly transverse, with emarginate distal margin. Apical palpomere four times shorter than penultimate ones. Head covered with short semi-erect hairs. Forehead-clypeal suture arch-shaped and deeply depressed. Forehead shining and canaliculate at its sides. Eyes large, well-developed.

Pronotum transverse, 1.56 times wider that long, covered with short sparse hairs that are longer on its sides. Anterior margin slightly convex in the middle and notched twice, apical angles sharp; lateral sides strongly sinuate at their basal halves. Hyaline membrane developed. Surface of disc and sides with sparse punctures and distinct microsculpture. Median groove whole and not deep. Anterior disc depressions small and almost completely round,

posterior depressions elongate and oblique.

Elytra oval, shining, with distinct microsculpture, strongly convex; separately rounded at their apexes. Five rows of punctures noticeable on disc between suture and humerus. The rows straight, with strong chaetophorous pores deeply depressed and densely located. Row intervals narrower than puncture diameter. Lateral grooves markedly narrow. Pseudoepipleurae wide anteriorly and evenly narrowed posteriorly, not reaching the elytral apex.

Aedeagus ( Figs 3–6 ), body evenly curved, distal lobe with short archly curved flagellum;

parameres widely moved apart from their bases, distinctly curved lacking apical setae; the right paramere reaches the aedeagus apex, the left one slightly longer reaching the distal lobe.

FEMALE. Similar to the male.

MEASUREMENTS. The length of the body: ♂ and ♀ 1.95–2.0 mm.

DIAGNOSIS. From the East Palaearctic species of the subgenus (viz. Ochthebius hak-

kaidensis Jäch, 1998 – Japan; O. lurugossus Jäch, 1998 – Russia Far East and China; O.

furcatus Pu, 1958, O. unimaculatus Pu, 1958, and O. yunnanensis d’Orchymont, 1925 –

China), having the pronotum without distinct admedian foveae ( Fig. 2 ), the new species can be distinguished by the pronotum with distinct admedian foveae, its anterior margin being slightly convex in the middle, notched twice and with sharp apical angles, as well as by the conformation of genitalia ( Figs 1, 3–6 ). From the three last species, O. sihotealiniensis also differs in the monochromatic dorsal surface of the body. From the Chinese species having distinct admedian foveae (O. flagellifer Jäch, 2003; O. pui Perkins, 1979), it can be separated by the less marked admedian foveae, the shape of the anterior margin of the pronotum and the conformation of genitalia.

DISTRIBUTION. Russia: Khabarovskii krai: Botchinsky Nature Reserve.

ETYMOLOGY. The name is derived from the Sikhote-Alin Mt. Range.

Figures

Figs 1–8. Ochthebius spp. 1, 3–6 – O. sihotealiniensis sp. n., male holotype: 1 – habitus,