Cheilosia (Eucartosyrphus) longula (Zetterstedt, 1838)

Fig. 42

Eristalis longula Zetterstedt, 1838: 613.

Cheilosia longula – Barkalov 1993: 712.

Differential diagnosis

Cheilosia longula is a small (body length: 6–9 mm), slender species, characterized by a bare face, bare eye, bicoloured legs, hyaline wings and lunule with reduced medial arm. Similar to C. ruffipes and C. scutellata, but these species have a broad facial tubercle, semicircular in dorsal view, while in C. longula the facial tubercle is narrow, almost conical in dorsal view. Like C. flavissima, but that species is paler, in the male the face is partly yellow, and the wing base is yellow (black in C. longula) and in the female the pro- and mesofemur and scutellum are completely yellow (pro- and mesofemur black with narrow yellow apices and scutellum at least along anterior margin black in C. longula).

Material examined

GEORGIA – Mtskheta-Mtianeti • 1 ♀; 42.6669° N, 44.6127° E; 2139 m a.s.l.; 13 Jul. 2019; A. Ssymank leg.; ASW, ZFMK-TIS-8009291.

Genetics

DNA barcodes of C. longula from Europe, Russian Far East and the Caucasus cluster together with high support (BS = 99.9%).

Remarks

Reported from Georgia for the first time.

Distribution

Europe, Caucasus, eastwards to eastern Siberia. Within the Caucasus, occurrence in countries other than Georgia uncertain. Barkalov (1993) reports it from the Greater Caucasus without specifying the country. Not reported from the Russian Caucasus in the Russian Checklist (Barkalov & Mutin 2018).