Cheilosia (Cheilosia) uviformis Becker, 1894

Fig. 74

Chilosia uviformis Becker, 1894: 499 .

Differential diagnosis

Cheilosia uviformis is difficult to identify, mainly because it is inconclusive in two characters often used in the identification of Cheilosia: the sterna are only slightly pruinose, which could be interpreted as either pruinose or shiny, and in the female the eye is sparsely pilose, which could easily be missed and consequently, the eye pilosity could be interpreted as either bare or pilose (the eye is distinctly pilose in the male). It is very similar to C. psilophthalma, whose Caucasian population also has slightly pruinose sterna. It is distinguishable from C. psilophthalma by bicoloured claws with orange base and black apex (claws all black in C. psilophthalma); the male by densely pruinose frons (shiny or indistinctly pruinose in that of C. psilophthalma) and narrow parafacia, about half as wide as width of postpedicel (about 0.8 times as wide as width of postpedicel in C. psilophthalma) and the female by sparse pilose eye (with distinct pile in that of C. psilophthalma). For differences with other species of Cheilosia, see Bot & Van de Meutter (2023).

Material examined

Cheilosia uviformis was not collected in 2018, but collected in 2019.

GEORGIA – Racha-Lechkhumi and Kvemo Svaneti • 1 ♂; 42.9150° N, 43.1430° E; 1969 m a.s.l.; 19 Jun. 2019; S. Bot leg.; SBA, SB.002942 • 1 ♂; 42.9160° N, 43.1428° E; 1975 m a.s.l.; 19 Jun. 2019; X. Mengual leg.; ZFMK, ZFMK-DIP-00066504 • 4 ♂♂; Tsana; 42.9089° N, 43.1425° E; 1900 m a.s.l.; 19 Jun. 2019 F. Van de Meutter leg.; FMT. – Samegrelo-Zemo Svaneti • 1 ♂; 43.1133° N, 42.7378° E; 1800 m a.s.l.; 14 Jun. 2019; X. Mengual leg.; ZFMK, ZFMK-DIP-00066507 = ZFMKTIS-8008814 • 3 ♂♂, 1 ♀; Ushguli; 42.9500° N, 43.0719° E; 2270 m a.s.l.; 15 Jun. 2019; F. Van de Meutter leg.; FMT • 8 ♂♂; 43.0671° N, 42.9471° E; 2684 m a.s.l.; 15 Jun. 2019; J.H. Skevington leg.; CNC, CNC1386513, CNC1386514, CNC1386523, CNC1386528, CNC1386534, CNC1386537, CNC1386554, CNC1386558 • 1 ♂; 42.9437° N, 43.0539° E; 2220 m a.s.l.; 15 Jun. 2019; X. Mengual leg.; ZFMK, ZFMK-DIP-00066506 • 2 ♂♂; 42.9498° N, 43.0718° E; 2270 m a.s.l.; 15 Jun. 2019; X. Mengual leg.; ZFMK, ZFMK-DIP-00066505, ZFMK-DIP-00066508 = ZFMK-TIS-8008813 • 5 ♂♂; Ushguli; 42.56° N, 43.04° E; 2260 m a.s.l.; 15 Jun. 2019; J. van Steenis leg.; JSB, 2019-01.123, 2019- 01.124, 2019-01.126 to 2019-01.128 • 2 ♂♂; 42.9480° N, 43.0700° E; 2258 m a.s.l.; 15 Jun. 2019; S. Bot leg.; SBA, SB.002950, SB.002951 • 1 ♂; Ushguli; 42.94° N, 43.05° E; 2220 m a.s.l.; 15–17 Jun. 2019; X. Mengual leg.; Malaise trap; ZFMK, ZFMK-TIS-8010119 • 1 ♀; same data as for preceding; ZFMK, ZFMK-TIS-8010118 • 4 ♀♀; Ushguli; 42.94° N, 43.05° E; 2220 m a.s.l.; 15–17 Jun. 2019; J. van Steenis leg.; JSB, 2019-01.100 to 2019-01.103 • 3 ♂♂; 42.9090° N, 43.0070° E; 2294 m a.s.l.; 16 Jun. 2019; S. Bot leg.; SBA, SB.002947 to SB.002949 • 1 ♂; Ushguli; 42.56° N, 43.04° E; 2260 m a.s.l.; 16 Jun. 2019; J. van Steenis leg.; 2019-01.180; JSB • 4 ♂♂, 2 ♀♀; 2 km SW of Ushguli; 43.0052° N, 42,8986° E; 2550 m a.s.l.; 17 Jun. 2019; F. Van de Meutter leg.; FMT • 1 ♀; 2 km SW of Ushguli; 43.0052° N, 42,9036° E; 2550 m a.s.l.; 17 Jun. 2019; F. Van de Meutter leg.; FMT • 3 ♂; 42.8980° N, 43.0080° E; 2601 m a.s.l.; 18 Jun. 2019; S. Bot leg.; SBA, SB.002944 to SB.002946 • 1 ♀; same data as for preceding; SBA, SB.002943 • 3 ♂♂, 6 ♀♀; 2 km SW of Ushguli; 43.0052° N, 42,8986° E; 2550 m a.s.l.; 18 Jun. 2019; F. Van de Meutter leg.; FMT • 3 ♂♂; 42.8964° N, 43.0047° E; 2658 m a.s.l.; 18 Jun. 2019; J.H. Skevington leg.; CNC, CNC1386812, CNC1386814, CNC1386817 • 1 ♀; same data as for preceding; CNC, CNC1386806 • 1 ♂; Zagarari Pass; 42.91° N, 43.09° E; 2585 m a.s.l.; 18 Jun. 2019; J. van Steenis leg.; JSB, 2019-01.145 .

Genetics

DNA barcodes of European and Caucasian specimens of C. uviformis cluster together with high support (BS = 100%).

Remarks

Reported from the Caucasus for the first time.

Biology

Remarkably, only sampled in 2019 while areas of occurrence were also visited in other years. Collected between 14 June and 20 June at an altitude between 1800 and 2684 m a.s.l. All specimens were caught visiting willow Salix sp. catkins on alpine and subalpine grasslands.

Distribution

Europe and Caucasus (Georgia).