Eumerus kopetdagicus Barkalov et Mutin, 2022

Barkalov, V. A. & Mutin, V. A., 2022, Two new species of the genus Eumerus Meigen, 1822 (Diptera: Syrphidae) from Central Asia, Far Eastern Entomologist 461, pp. 24-30 : 25-26

Eumerus kopetdagicus Barkalov et Mutin sp. n.

https://zoobank.org/NomenclaturalActs/ 8A06A088-A372-4FF2-937A-5806B83D9750

Figs 1‒6

TYPE MATERIAL. Holotype ‒ ♂, Turkmenistan: Kopet Dag , 20 km E Nohur, Kara-

Yalchi Gorge, 28.IV 1991, V. Dubatolov, V. Zinchenko leg. [ SZMN]. Original label: “Турк-

мениЯ, Копетдаг, 20 км В Нохура, уЩ. КараЯлчи, 28.04.1991, leg. В . В . Дубатолов, В.К.

Зинченко”. Paratype: 1 ♂, Turkmenistan: Central Kopet Dag , Dushak Mountain, 1800 -

1900 m, 10.IV 1987, V. Dubatolov leg. [ SZMN] .

DESCRIPTION. Male. Body length 9.0‒ 9.6 mm, wing length 6.1‒6.2 mm.

Head. Face narrow, black with blueish reflection, grey pollinose in middle, with dense erect silver pile. Frons narrow, with appressed dense silver pile, masking its coloration. Vertex long, shiny black, with white and black pile; ocellar triangle equilateral. Occiput shiny black,

without pollinose, with yellow pile. Scapus and pedicel of antenna dark brown; basoflagellomere small, irregular form ( Fig. 1 ), mainly dark-brown except light-brown basal part, with deep groove separating light and dark parts, on apical part with clearly demarcated ellipsoidal fossa; arista rather short, thickened in basal ¼, black with lighter tip. Eyes with short distinct white pile, coalescent at one point touching for a distance of 5 ommatidia ( Fig. 2 ).

Thorax. Scutum and scutellum coarsely punctate, shiny, with short erect yellow pile;

scutellum with distinct marginal bearding. Pleura shiny black, with short yellow pile; katatergum with short dense brown pile ( Fig. 5 ). Legs: pro- and mesocoxae brown, metacoxa black;

femora mainly black except yellow apex, with short yellow pile; metafemur moderately swollen

( Fig. 6 ); tibiae yellow in basal 1/3 and apically, shorter than femora; metatibia without any setulae baso-ventrally; tarsi blackish dorsally and yellow ventrally, basal and apical tarsomeres yellowish apically. Wings hyaline; membrane in the main with microtrichia except basal half of cells bm and cup bare.

Abdomen coarsely punctate, mostly black except brownish posterior 1/3 of tergum IV,

with grey pollinose narrow oblique maculae on terga II, III and IV; tergum II with erect white pile laterally and short appressed black and white pile otherwhere; sternum IV with shallow incision ( Fig. 3 ). Genitalia – Fig. 4 .

Female. Unknown.

head dorsally; 3 ‒ sternum IV ventrally; 4 ‒ genitalia laterally. Scale bars in mm.

DIAGNOSIS. In the key to Palaearctic Eumerus species (Stackelberg, 1961) E. kopetdagicus sp. n. keys out to E. latitatsis Macquart, 1838 , but well differs from latter by entirely shiny scutum, without pollinose vittae (scutum of E. latitarsis with distinctly visible pattern of pollinose maculae and vittae). In addition, E. latitarsis is the endemic of Canary Islands.

The new species is very similar to E. atricolorius Gilasian et van Steenis, 2020 found in Iran and also known only from the male, but differs from latter by mainly black dorsal surface of abdomen as well as yellow basal 1/3 of tibiae ( E. atricolorius has abdomen predominantly reddish-brown and tibiae with basal narrow orange margin). Male genitalia of E. kopetdagicus sp. n. is also a like of the E. atricolorius one, however posterior lobe of surstylus (lateral view) has not visible rows of short median setulae and is covered rather by thin pile.

DISTRIBUTION. Turkmenistan: Kopet Dag Mountains.

ETHYMOLOGY. The species name reflects the geographic location of catching of the type material.

Figures

Figs 1‒4. Eumerus kopetdagicus sp. n., male. 1 ‒ pedicel and flagellomere laterally; 2 ‒

Figs 5‒10. Eumerus ssp. 5 ‒ 6 ‒ E. kopetdagicus sp. n.: 5 ‒ male laterally; 6 ‒ metaleg