Diamesa cinerella Meigen, 1835

Diamesa cinerella Meigen View in CoL

( Figs. 5 View FIGURES 1–7 , 8 View FIGURES 8–14 , 15–18 View FIGURES 15–18 )

Diamesa cinerella Meigen View in CoL in Gistl, 1835: 66; Pagast 1947: 481; Serra-Tosio 1971; Willassen & Serra-Tosio 1988: 92; Langton & Visser 2003: 18; Langton & Pinder 2007: 57; Ashe & O’Connor 2009: 273; Rossaro & Lencioni 2015: 73; Montagna et al. 2016: 326 View Cited Treatment .

Diamesa waltlii Meigen, 1838: 13 View in CoL . Material examined. 4 adult males, FRANCE: Machais Nature Reserve , Vosges, Valche glacial stream, collected by Malaise trap, 19.V.2021, leg. J. Claude and A. Badre. 2 adult males SWITZERLAND: Grisons, Macun, Lake Immez, Rive droite, 30.7– 15.VIII.2014, leg., B. Lods-Crozet ; 1 adult male, the same place except, Valais, Muttbach , 25.VIII.1998, leg. B. Lods-Crozet ; 1 adult male, the same place except, Grisons, Macun, Lake Grond , 30.VII– 15.VIII.2014, leg. S. Knispel.

Description

Adult male (n = 6, except when otherwise stated). Total length 3.3–4.6, mm. Total length/wing length 0.93–1.15.

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

Head. Eyes hairy, reniform. Temporal setae including 5–9 preoculars, 9–16 verticals. Clypeus with 6–14 setae. Antenna with 13 flagellomeres and little reduced plume of setae ( Fig. 5 View FIGURES 1–7 ), flagellomere with 4–6 setae, maximal length of which 410 µm; terminal flagellomere with 1 subapical setae, 36–48 μm long; scopus with 2 setae 48–52 μm long. Length of flagellomeres 1–13 (in μm) (n = 1): 100, 44, 48, 48, 48, 48, 52, 56, 56, 52,56, 53, 332; AR 0.49–0.70. Palpomere length (in μm): 44–56, 80–116, 104–156, 120–164, 180–232. Palpomere 3 in distal part with a sensilla capitata with diameter 16–20 μm. Head width/palpal length 1.04–1.29. Antennal length/palpal length 1.37–1.88.

Thorax. Antepronotum with 5–9 ventrolateral setae. Dorsocentrals 13–15, prealars 8–11. Scutellum with 31–32 setae.

Wing ( Fig. 8 View FIGURES 8–14 ). Length 3.7–4.0 mm, width 1.2–1.3 mm. Anal lobe rounded-angular. Squama with 37–39 setae, 112–140 μm long. R + R 1 with 37–39 setae, R 4+5 with 19–22 setae. RM/MCu 3.0–3.2. Costa extension 80 μm long.

Legs. Spur of front tibia 48–76 µm long. Spurs of mid tibia 60–72 and 52–60 µm long. Spurs of hind tibia 80–92 and 52–60 µm long. Hind tibial comb with 16–20 setae. Length (μm) and proportions of leg segments are as in Table 2.

Hypopygium ( Figs 15–18 View FIGURES 15–18 ). Tergite IX with 14–15 setae from one side and anal point, 184 µm long. Laterosternite IX with 9–11 setae. Transverse sternapodeme 164 μm long and 72 μm wide. Gonocoxite 440 µm long; inferior volsella 188 µm long, in the form of a tongue-shaped lobe, covered with short setae. Basimedial setal cluster with 6–8 setae, 68–100 µm long. Gonostylus 308 µm long, curved, widened in basal third and rounded or roundedtriangular along the inner edge; distal two-thirds narrow, with 7–10 short setae along inner edge and with megaseta ca 12 µm long and tooth at apex. HR 1.43.

Pupa. Described by Serra-Tosio (1971) and Langton & Visser (2003).

Larva. Described by Schmid (1993) and Rossaro & Lencioni (2015).

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