Eumerus tadzhikorum Stackelberg, 1949

Grkovic, Ana, Smit, John, Radenkovic, Snezana, Vujic, Ante & Steenis, Jeroen van, 2019, Two new European long-legged hoverfly species of the Eumerusbinominatus species subgroup (Diptera, Syrphidae), ZooKeys 858, pp. 91-108 : 98-99

Eumerus tadzhikorum Stackelberg, 1949 Figs 1C, D; 2C, D; 6

Notes.

Described from Tajikistan and known from southern Kazakhstan, Kyrgyz, Tajikistan, Turkmenistan and Uzbekistan ( Peck 1988). The holotype is held in ZISP and has been examined by the last author. Additional material of E. tadzhikorum identified by Stackelberg was studied too.

Material examined.

Holotype ♂ Eumerus tadzhikorum Stackelberg, 1949: “16.VI.[19]44”, " Eumerus typ. '46 / tadzhikorum sp. nov. / Stackelberg det.", " Holotypus '49 / Eumerus / tadzhikorum Stack." [red label, partly handwritten], " Lectotypus Eumerus / tadzhikorum Stack / design. V. Richter " [red label, partly handwritten], ( ZISP).

Additional material. Kazakhstan: "KZ Oblast Almaty / Tamgaly 886 m / lat 43.802 lng 75.534 / 8 V 2015 leg. S. Bot", 1♂ ( SBPC); " KAZAKHSTAN 29.V.2001 / SE Chilik 700m / 43°40'N 78°29'E / leg. M. Hauser ", 1♂ ( CSCA) . Armenia : “Мегри на р. Аракс / Армения / В. Рихтер” with added handwritten " 2.5 km B. m. g. / стаиции / 7.V. 974", 1♂ ( ZISP) .

Diagnosis.

Male. Eyes clearly separated by width of basoflagellomere. Wing with a dark spot (Fig. 1C, D). Antenna black and as high as long (Fig. 2D). Metafemur with row of about 7 rather long black setae, which are about 1/3 as long as width of metafemur. Abdomen partly red (Fig. 1C, D). Posterior surstyle lobe anteriorly with fan-like protruding structure, separated by deep incision.

Remarks.

This species is extremely similar to E. binominatus and it is possibly a subjective junior synonym of this species. The length of the setae on the apico-ventral side of the metafemur seems to vary in number and length. Due to lack of material no conclusion will be drawn here.