Diamesa tonsa Haliday

Diamesa tonsa Haliday View in CoL

( Figs 31–32 View FIGURES 31–34 )

Diamesa tonsa Haliday View in CoL in Walker, 1856: 195; Pagast 1947: 485; Langton & Visser 2003: 50; Langton & Pinder, 2007: 57; Ashe & O’Connor 2009: 286; Krasheninnikov 2009: 65; Rossaro & Lencioni 2015: 74; Montagna et al. 2016: 326 View Cited Treatment .

Chironomus pergens Walker, 1856: 187 View in CoL .

Chironomus pertracta Walker, 1856: 188 .

Diamesa fissipes Kieffer, 1909: 41 View in CoL .

Diamesa thienemanni Kieffer, 1909: 40 View in CoL ; Pagast 1947: 484; Serra-Tosio 1969: 208, 1971: 230.

Diamesa camptoneura Kieffer, 1915: 109 View in CoL ; Goetghebuer, 1932: 182, 1939: 12.

Diamesa semireducta Saether, 1968: 457 View in CoL

Material examined. 4 adult males, RUSSIA: Perm Territory, Suksunsky District, Suksun urban locality, mouth of Suksunchik River , 08.IV.2012, 57.14769 N 57.390170 E, leg. A. Krasheninnikov GoogleMaps ; 2 adult males, same data except Republic of Dagestan, Tlyaratinsky District, Caucasus Mountains , Sulak River basin, Dzhurmut River , alt. 1775 m a. s. l., 10. GoogleMaps VIII.2021, 41.9727 N 46.5068 E, leg. D. Palatov GoogleMaps ; 3 adult males, GEORGIA: Samegrelo-Zemo Svaneti, Martvili municipality, Caucasus Mountains, Rioni River basin, Abasha River in the Balda valley , 13. VIII.2016, 42.4847 N 42.3942 E, leg. D. Palatov GoogleMaps ; 2 adult males, IRAN: Mazandaran Province, Elburs ridge, under Mount Siahseng, above of Devilat Village , alt. 2792 m a. s. l., 15. VI.2019, 36.230917 N, 51.842550 E, leg. D. Palatov GoogleMaps ; 1 adult male, NORWAY, Ekse, Vaksdal , 10–16. VIII.1976, leg. T. Andersen .

Description

Adult male (n = 4, except when otherwise stated). Total length 3.4–4.2 mm. Total length/wing length 1.10–1.26.

Coloration. Dark brown. Legs brown. Wings grayish, venation brownish.

Head. Eyes hairy, reniform. Temporal setae including 4–5 preoculars, 7–11 verticals. Clypeus with 8–9 setae. Antenna with 13 flagellomeres and reduced plume of setae, maximal length of which 689 µm; terminal flagellomere with 1 subapical setae, 28–40 μm long. Length of 1–13 flagellomeres (μm) (n=2): 56–84, 32–36, 36–40, 40–44, 44, 44–48, 48, 52–56, 56–60, 56–64, 344–396; AR 0.56–0.69. Palpomere length (μm): 40, 88, 88, 104, 128. Palpomere 3 in distal part with sensilla capitata with diameter 12 μm. Head width/palpal length 1.32.

Thorax. Antepronotum with 7 ventrolateral setae. Dorsocentrals 10–12, prealars 5–8. Scutellum with ca 30 setae.

Wing. Length 3.12–3.60 mm, width 0.92–1.4 mm. Anal lobe rounded-angular. Squama with 28–31 setae in 1–2 rows. R and R 1 with 27–32 setae, R 4+5 with 10–17. RM/MCu 2.7–3.

Legs. Spur of front tibia 56 µm long. Spurs of mid tibia 64 and 60 µm long. Spurs of hind tibia 88 and 60 µm long. Hind tibial comb with 12–14 setae. Length (μm) and proportions of leg segments are as in Table 8.

Hypopygium ( Figs 31–32 View FIGURES 31–34 ). Tergite IX with 17–21 setae from one side and anal point, 120–152 µm long. Laterosternite IX with 11–14 setae. Transverse sternapodeme 120–140 μm long and 36–52 μm wide. Gonocoxite 336–392 µm long; inferior volsella with two branches, 57–60 µm long and 168–172 µm long. Basimedial setal cluster with 4–5 setae 64–68 µm long. Gonostylus 249–252 µm long, almost crescent-shaped, with short megaseta and tooth. HR= 1.4–1.6.

Pupa. Described by Langton & Visser (2003).

Larva. Described by Rossaro & Lencioni (2015).

Distribution. Widely distributed in the Western Palaearctic ( Ashe & O’Connor 2009).