Eumerus grunini Barkalov et Mutin, 2024

Barkalov, A. V. & Mutin, V. A., 2024, TWO NEW HOVERFLY SPECIES OF THE GENUS EUMERUS MEIGEN, 1822 (DIPTERA: SYRPHIDAE) FROM RUSSIA, Far Eastern Entomologist 510, pp. 1-6 : 4-6

Eumerus grunini Barkalov et Mutin , sp. n.

https://zoobank.org/NomenclaturalActs/ 8A1D7890-1E36-467D-910B-46304D21448D

Figs. 8‒12 , 15–16

TYPE MATERIAL. Holotype ‒ ♂, Russia: Trasbaikal Region [=Chita Region], Borzinskij district, Rudnik Abachajtuj, 12. V 1959, Grunin leg. [ ZISP]. Original labels in Russian: “ЧитинскаЯ область, БорЗинский р-н, рудник Абачайтуй 12. V.1959 (Грунин)” . Paratypes: 4♂, the same place and time [of them 3♂ in ZISP and 1♂ in SZMN]; 1♂, the same place but 13. V 1959, Grunin leg. [ ZISP].

DESCRIPTION. Male. Body length 7.2‒8.3 mm, wing length 5.0‒6.0 mm.

Head ( Fig. 15 ). Face black, finely grey pollinose, with dense erect white pile. Gena narrow, shiny. Frontal triangle with dense pressed white pile, hiding main color of frons; angle of approximation of eyes less 90⁰. Antenna brownish-black; basoflagellomere irregular form, grey pollinose, with comparatively big sensory fossa; arista short ( Fig. 9 ). Eyes with dense long white pile, connected on distance approximately equal to 4 ommatidia. Vertex black, non pollinose, with white pile; ocellar triangle almost equilateral ( Fig. 11 ). Occiput pruinose, except dorsal occiput shiny, with white pile.

Thorax. Mesonotum black, shiny, without pruinose pattern, covered with short erect white pile. Pleura shiny, with semi-erect white pile. Legs. Coxae and trochanters black, without any process. Femora black, with narrowly yellow tips; metafemur slender, with semierect yellow pile dorsally and two rows of black spikes in apico-ventral 1/3 ( Fig. 10 ). Pro- and mesotibia mostly black, except basal 1/4-1/5 and apices narrowly brownish-yellow. Metatibia brownish in basal half and black apically, with short black procumbent setulae ventrally. Tarsi black dorsally and yellow ventrally, except entirely yellow 5th tarsomere ( Fig. 10 ). Wing membrane mainly hyaline, yellowish basally, microtrichose except bare bases of basal cells.

Abdomen. Broadest on central part of tergum II and gradually tapering to top. Terga black with blueish reflection, except yellow posterior margin of tergum IV, without pruinose or yellow maculae; pilosity short pressed or semi-pressed white except some short black pile on central part. Sternites I-IV brownish. Sternum VI black, with yellow pile. Sterna IV raised medially, but without forming a keel, its posterior margin with distinct cut ( Fig. 12 ).

Genitalia ( Fig. 8 ). Epandrium with strong reduced anterior surstylar lobe; posterior surstylar lobe noticeably elongated, with rounded top. Cercus very small. The hypandrium is curved, tapering evenly towards the apex.

DIAGNOSIS. E. grunini sp. n. differs from known Palaearctic species by absence of any pruinose marks, vittae or maculae on mesonotum as well as on abdominal terga and by construction of male genitalia.

DISTRIBUTION. Russia: Transbaikal Region.

ETHYMOLOGY. The new species is named in honor of the famous Soviet dipterologist Konstantin Yakovlevich Grunin, who collected the type material.

Figures

Figs 8‒12. Eumerus grunini sp. n. 8 – male genitalia laterally; 9 – 2‒3 segments of antenna laterally; 10 – metaleg laterally; 11 – ocellar triangle dorsally; 12 – tip of abdomen ventrally. Scale bars in mm.

Figs 13‒16. Eumerus ssp. 13, 14 ‒ E. pilosus sp. n.; 15, 16 ‒ E. grunini sp. n.; (13, 15 ‒ male laterally; 14, 16 ‒ head dorsally). Scale bars: 13, 15 = 1.0 mm; 14, 16 = 0.5 mm.