Oreodytes mongolicus Brinck, 1943

Enkhnasan, Davaadorj & Boldgiv, Bazartseren, 2019, Endemic and sub-endemic water beetles of Mongolia and their distribution ranges, Journal of Species Research 8 (4), pp. 395-406 : 399-400

Oreodytes mongolicus Brinck, 1943 ( Fig. 2 )

Diagnosis. Body length 4.0 - 4.5 mm. Oblong-oval, slightly convex. Dorsum yellow, with narrow black stripe on the vertex; a more or less distinct additional dark spot near the eyes; pronotum with two spots near the base that are either fused or more less reduced; the following areas on the elytra black: suture, six longitudinal lines which do not reach the base, two oblong spots, and sometimes also a more or less long dash at the lateral margin. Three inner lines contiguous at the posterior end; three outer lines also often contiguous at the end; venter black; epipleura yellow; legs and antennae reddish; last antennal segments black apically. Pronotum much narrower than elytra, with a transverse depression or flattened near the base; sides of pronotum slightly rounded; lateral ridge very weak; lateral dash short and shallow; posterior angles almost rectangular; their apex not blunt. Elytra of male slightly oblique, with weakly marked indentation; in the female, there is indentation before the sutural denticle, which is slightly produced posteriorly. Dorsum markedly shagreened, slightly more shagreened in the female and also with more or less scattered dots, which are of slightly different size ( Brinck, 1943).

Material examined. Zavkhan aimag: 2♂♂, 1$, Tosontsengel soum, 16 km of river Delgerekh , N48.15785, E97.21437 ; Arkhangai aimag: 1$, Khangai soum, River Khoid Ekhen , N47.75747, E99.35827 ; Övörkhangai aimag: 1♂, Bat-Ölzii soum, River Orkhon, N46.89303, E102.39457 . Töv aimag: 1♂, 1$, Erdene soum, River Tuul, Gorkhi-Terelj National Park , N48.09549, E107.84265 ; Bayan-Ölgii aimag: 2$$, Ulaan Hus soum, 14 km NE of Jalpak, River Khar Yamaat , N49.38138, E88.6839 ; 5♂♂, 2$$, Khovd gol near the soum centre, N49.0419, E89.41659 ; 2♂♂, 1$, Nogoonnuur soum, River Baga Khatuu , N49.7734, E90.02274 ; 1♂, 2$$, Tributary of River Khovd, at Develyn aral, N50.01458, E91.6014 ; 2♂♂, 4$$, pond 20 km NW of Nogoonnuur , N49.71056, E89.98618 ; Uvs aimag: 1$, Undurkhangai soum, river Baruun Turuun 20 NNE of soum center, N49.44592, E94.79595 ; 1♂, 2$$, Ömnögovi soum, unnamed (Bornuur) lake, 24 km NNE of soum center; 1$, River Orlogo , 25 km N of soum center, N49.33993, E91.68145 ; 1♂, Khovd soum, spring Deed Nuuryn Bulag , 37 km E of soum center, N49.298, E91.28097 ; 1$, Turgen soum, Tributary of River Khöndlön , N50.01458, E91.6014 ; 1♂, 1$, River Turgen , N49.88653, E91.34708 ; 8♂♂, 4$$, Confluence of rivers Javart and Turgen , 33 km SW of soum center, N49.89234, E91.35239 ; 4♂♂, 2$$, Bökhmörön soum, river Tavan Salaa , N49.7038, E90.23026 ; 3♂♂, 4$$, Tarialan soum, River Kharkhiraa gol, 4 km W of soum center, N49.77959, E91.86026 ; Hövsgöl aimag: 3♂♂ 7$$, Renchinlhumbe soum, river Arsain gol, N51.25344, E99.66698 ; 2♂♂, 1$, three connected ponds, 19 km N of soum center, N51.25344, E99.66698; 3$$, Arbulag soum, lake Davst (salty), 3 km N of soum center, N49.90643, E99.39368 .

Published records. Guéorguiev, 1965:128 - Bayankhongor, Övörkhangai; Guéorguiev, 1968:25- Töv ; Guéorguiev, 1968a:287, 288- Zavkhan, Khovd; Guéorguiev, 1972:34 - Khentii; Bellstedt, 1985:138 - Ulaanbaatar; Shaverdo et al., 2008:51 - Zavkhan, Hövsgöl, Arkhangai, Töv, Övörkhangai; Enkhnasan and Boldgiv, 2019:106 - Bayan-Ölgii, Uvs, Hövsgöl.

Remarks. Oreodytes mongolicus Brinck, 1943:155 - [Holotype ♂ (Private collection of P. Brinck): Mongolia, Kemtchik, 1914, leg. F. Jensen].

This species was collected from Central Asian Inland Basin and Arctic Ocean Basin in Mongolia. It was collected from many sampling points of these two basins. Specimens are kept at the Institute of Biology, MAS.

Figures

Fig. 2. Oreodytes mongolicus Brinck, 1943. Photos by Enkhnasan. a. Dorsal habitus, male, b. Head and pronotum, c. Adeagus, laterial view.