Cheilosia ( Cheilosia ) pseudogrossa Stackelberg, 1968

Bot, Sander, Mengual, Ximo, Meutter, Frank Van de & Skevington, Jeffrey H., 2025, Review of the genus Cheilosia Meigen, 1822 (Diptera: Syrphidae) from the Caucasus, with the description of 14 new species, European Journal of Taxonomy 1023, pp. 1-181 : 114-116

Cheilosia ( Cheilosia) pseudogrossa Stackelberg, 1968

Fig. 58

Cheilosia pseudogrossa Stackelberg, 1968: 228 .

Cheilosia pseudogrossa – Stackelberg & Richter 1968: 248. — Stackelberg 1970: 59. — Barkalov 1993: 714. — Barkalov & Mutin 2018: 483. — Mengual et al. 2020: 20.

Cheilosia pseudogrossa Stackelberg, 1956 [sic] — Gujabidze 2002: 246.

Differential diagnosis

Cheilosia pseudogrossa is genetically and morphologically very similar to C. grossa . It can however easily be identified from it by the pilose face (bare in C. grossa ). Other differences in the male (we could not study the female) include the postpedicel being dark orange to brown (black in C. grossa ), face ventrolateral of facial tubercle not swollen (swollen in C. grossa ), pile on anepimeron with straight apex (with wavy apex in C. grossa ) and terga III–IV pruinose (lateral sides of tergum III widely shiny and tergum IV entirely shiny except anterior margin in C. grossa ).

Material examined

Not collected in 2018, but collected in 2023.

GEORGIA – Mtskheta-Mtianeti • 1 ♂; Lutkhubi ; 42.3984° N, 44.7996° E; 2068 m a.s.l.; 8 May 2023; S. Bot leg.; SBA, SB.003236 = ZFMK-TIS-8027992 • 1 ♂; Lutkhubi; 42.4006° N, 44.7956° E; 2130 m a.s.l.; 8 May 2023; F. Van de Meutter leg.; FMT, ZFMK-TIS-8027940 .

Genetics

The two DNA sequences of C. pseudogrossa cluster together with high support (BS = 99.7%) in our NJ tree. See Genetics under C. grossa .

Biology

During our expeditions, collected on 8 May at an altitude between 2068 and 2130 m a.s.l. on flowering willow Salix sp.

Distribution

Caucasus ( Abkhazia region, Georgia, Russia).