Diamesa kasymovi Kownacki et Kownacka

Diamesa kasymovi Kownacki et Kownacka View in CoL

( Figs 7 View FIGURES 1–7 , 13 View FIGURES 8–14 , 29–30 View FIGURES 27–30 )

Diamesa kasymovi Kownacki et Kownacka, 1973: 32 View in CoL ; Willassen & Serra-Tosio 1988: 94; Langton & Visser 2003: 27; Ashe & O’Connor 2009: 278; Ghaderi et al. 2024: 82 View Cited Treatment .

Material examined. 5 adult males, RUSSIA: Republic of Dagestan, Tlyaratinsky District, Caucasus Mountains , Sulak River basin, Dzhurmut River , alt. 1775 m a. s. l., 10.VIII.2021, 41.9727 N 46.5068 E, leg. D. Palatov GoogleMaps ; 1 adult male, same data except Kabardino-Balkarian Republic, Elbrussky District, The Adyl-Su River , Terek River basin, opposite the Dzhan-Tugan mountain hotel, 06.VIII.2023, 43.217675 N 42.691864 E, leg. D. Palatov. GoogleMaps

Description

Adult male (n = 2, except when otherwise stated). Total length 3.1–3.3 mm. Total length/wing length 1.11. Coloration. Dark brown. Head, thorax, abdomen and legs dark brown. Wings greyish, with brownish veins. Head. Eyes hairy, reniform. Temporal setae including 4–6 preoculars,8–12 verticals. Clypeus with 8–10 setae. Antenna with 8 flagellomeres and reduced plume of setae ( Fig. 7 View FIGURES 1–7 ); number and length of these setae on 1–7 flagellomeres respectively: 1 (68 μm), 1 (88 μm), 2 (72–108 μm), 3 (60–96 μm), 2 (120 μm), 3 (80–108 μm), 3 (88–100); terminal flagellomere with 2 setae, 60–64 μm long in basal part and with 1 subapical setae, 36 μm long. Length of 1–8 flagellomeres (μm): 72–76, 40–44, 40–48, 36–40, 36–40, 36, 40, 120–140; AR 0.37–0.47. Palpomere length (μm): 44–48, 76–84, 108–120, 120–124, 128–192. Palpomere 3 in distal part with sensilla capitata with diameter 16 μm. Head width/palpal length 1.11–1.32. Antennal length/palpal length 0.79–0.90.

Thorax. Antepronotum with 12 ventrolateral setae. Dorsocentrals 9, prealars 5–7. Scutellum with 20–26 setae, 172 µm long.

Wing ( Fig. 13 View FIGURES 8–14 ). Length 2.8–3.0 mm, width 0.92–0.96 mm. Costal extension 49–60 µm long. Anal lobe rounded-angular. Squama with 24–25 setae, 131–361 μm long. R and R 1 with 30–31 setae, R 4+5 with 17–24. RM/MCu 3.3.

Legs. Spur of front tibia 44–48 µm long. Spurs of mid tibia 40–44 µm and 40–52 µm long. Spurs of hind tibia 76 µm and 44–48 µm long. Hind tibial comb with 15–16 setae. Length (μm) and proportions of leg segments are as in Table 7.

Hypopygium ( Figs 29–30 View FIGURES 27–30 ). Tergite IX with 20–22 short setae, and anal point, 124–148 µm long. Laterosternite IX with 7–12 setae. Transverse sternopodeme,140–160 µm long, 28–36 µm wide. Gonocoxite 328–356 µm long, with 22–25 basimedial setae, 160–192 µm long; inferior volsella 140 µm long, wider at the base, gradually narrowing towards apex. Gonostylus 252–260 µm long, almost crescent-shaped, in basal half it is widened and rounded, in distal half it is finger-shaped, with short setae along the inner edge, and at the apex with short megaseta and tooth. HR 1.26–1.41.

Pupa and larva. Described by Kownacki & Kownacka (1973).

Distribution. According to Ashe & O’Connor (2009), species is widespread in Austria, Azerbaijan, Belgium, Georgia, Italy, Lebanon, Poland, Slovakia, Switzerland, Turkey but we believe that it is reliably known only from Azerbaijan, Georgia, Lebanon, Iran ( Kownacki & Kownacka 1973, Willassen & Serra-Tosio 1988, Ghaderi et al. 2024) and from the Caucasus Mountains in Russia (Republic of Dagestan, Kabardino-Balkarian Republic).