Diamesa lavillei Serra-Tosio

Diamesa lavillei Serra-Tosio View in CoL

( Figs 4 View FIGURES 1–7 , 9 View FIGURES 8–14 , 19–22 View FIGURES 19–22 )

Diamesa lavillei Serra-Tosio, 1970: 163 View in CoL ; Shilova 1978: 142; Langton & Visser 2003: 30; Ashe & O’Connor 2009: 280; Mohammadi et al. 2021: 1234.

Material examined. 1 adult male, RUSSIA: Republic of North Ossetia-Alania, Irafsky District, Caucasus Mountains , Terek River basin, Kumaldon River , 29.XII.2017, alt. 1228 m a. s. l., 42.9679 N 43.7867 E, leg. D. Palatov GoogleMaps ; 2 adult males, the same data, except, Alagirsky District, Caucasus Mountains, Terek River basin, Skazdon River , alt. 1943 m a. s. l., 27.VII.2019, 42.7842 N 43.9037 E, leg. D. Palatov GoogleMaps ; 1 adult male, the same data except, Karachay-Cherkess Republic, Zelenchuksky District, Sofia River , Kuban’ River basin, 4 km from the tract “Taulu Glade”, alt. 1814 m a. s. l., 5.IV.2023, 43.485125 N 41.243800 E, leg. D. Palatov GoogleMaps ; 1 adult male, the same data, except, Republic of Dagestan, Dokuzparinsky District, Caucasus Mountains , spring sources of the Selda River , alt. 2712 m a. s. l., 20.VIII.2024, 41.251603 N, 47.858658 E, leg. D. Palatov. GoogleMaps 1 adult male, the same data, except, Kabardino-Balkarian Republic, left tributary of the Shkhelda River , 2.8 km above the mouth, alt. 2220 m a. s. l., 30.VII.2023, 43.209367 N, 42.649386, leg. D. Palatov GoogleMaps ; 2 adult males, IRAN: Lorestan Province, Aligudarz County, Zagros Mountains, Dalooni Preserve Park , Dare Daei River , alt. 2244 m a. s. l., 13. VI.2019, 33.186067 N 49.510117 E, leg. D. Palatov. GoogleMaps

Description

Adult male (n = 4, except when otherwise stated). Total length 3.8–3.9 mm. Total length/wing length 0.98–1.04.

Coloration. Dark brown to black. Wings grey, with brownish veins.

Head. Eyes hairy, reniform. Temporal setae including 5–8 preoculars and 14. Clypeus with 11 setae. Antenna with 13 flagellomeres and reduced plume of setae ( Fig. 4 View FIGURES 1–7 ); flagellomeres 1–12 with 2–3 setae on flagellomere, 80–104 μm long; terminal flagellomere with 8 setae, 88–104 μm long in basal part and with 1 subapical setae, 36 μm long. Length of flagellomeres 1–13 (in μm) (n = 1): 112, 52, 52, 52, 44, 40, 40, 48, 52, 44, 48, 52, 224; AR 0.33–0.39. Palpomere length (in μm) (n = 1): 44, 108, 148, 144, 192. Palpomere 3 in distal part with sensilla capitata with diameter 20 μm. Head width/palpal length 1.03. Antennal length/palpal length 1.35.

Thorax. Antepronotum with 11–16 ventrolateral setae. Dorsocentrals 14–20, prealars 6–11. Scutellum with 36–50 setae.

Wing ( Fig. 9 View FIGURES 8–14 ). Length 3.6–4.0 mm, width 1.1 mm. Costal extension 92 µm long. Anal lobe rounded-angular. Squama with 17 setae, 48–92 μm long. R + R 1 with 30–38 setae, R 4+5 with 12–15. RM/MCu 2.0.

Legs. Spur of front tibia 58–60 µm long. Spurs of mid tibia 56–60 µm and 56–64 µm long. Spurs of hind tibia 100 µm and 56–64 µm long. Hind tibial comb with 17–20 setae. Length (μm) and proportions of leg segments are as in Table 3.

Hypopygium ( Figs 19–22 View FIGURES 19–22 ). Tergite IX with 22–23 setae, 16–24 µm long and with narrow (4-anal point, 160 µm long. Laterosternite IX with 10–11 setae. Transverse sternapodeme 200 µm length and 20 µm width. Gonocoxite 400 µm long; inferior volsella 252 µm long, widened in basal quarter and narrowed finger-shaped in remaining part, inner edge is covered with short and medium-length setae. Basimedial setal cluster with 20–26 setae, 108–176 µm long. Gonostylus 344 µm long, slightly curved, basally widened, then gradually narrows towards the top, with short megaseta and tooth at apex. HR 1.16.

Pupa. Described by Serra-Tosio (1970, 1971) and Langton & Visser (2003).

Larva. Described by Mohammadi et al. (2021)

Distribution. High mountain Palaearctic species. Known from France, Georgia, Spain, Turkey, Iran ( Ashe & O’Connor 2009, Mohammadi et al. 2021) and Russia (Caucasus Mountains of Dagestan, Kabardino-Balkarian Republic, Republic of North Ossetia – Alania and Karachay-Cherkess Republic).