| Summary: | Diamesa urvantsevi Krasheninnikov et Makarchenko, sp. nov. http://zoobank.org/NomenclaturalActs/ 2106E8A2-D575-4435-981C-8D4B844676C9 (Figs. 1–4, 8–10) Type material. Holotype, adult male, RUSSIA: Severnaya Zemlya Archipelago, Bolshevik Island, Mikoyan Bay, Chernaya River, N 79.20768 E 102.3109, 01.IX.2019, leg. A. Krasheninnikov. Paratypes: 7 adult males, the same data as holotype. Derivatio nominis. The species is named in honor of Nikolay Nikolayevich Urvantsev (1893–1985). He was a Soviet geologist and explorer who together with Georgy Ushakov investigated the Severnaya Zemlya Archipelago and made it first map. Adult male (n = 3). Total length 3.5–3.8 mm. Wing length 3.30–3.84 mm. Total length/wing length 0.98–1.05. Wing length/length of profemur 2.41–2.50. Colouration. Head, thorax, legs and hypopygium dark brown; antenna brown; palpomeres light brown; abdomen light brown to brown; wing veins yellowish brown. Head. Eyes hairy, i.e., length of eye microtrichia about 1.5 or more times the height of ommatidial lenses and visible along lateral eye margin when head is viewed from front (after: Hansen & Cook 1976). Temporal setae 27–32, including about 9–18 verticals, 7–8 preoculars, 6 postorbitals. Clypeus with 17–21 setae. Antenna with 13 flagellomeres and well-developed plume; terminal flagellomere 132–140 μm long, with rounded apex and 2–3 subapical setae 20–76 μm long. AR 1.06–1.19. Palpomeres lengths (in μm): 40–44; 84–96; 120–148; 120–132; 148–168. Palpomere 3 in distal part with sensilla capitata (sunken organ) with diameter 16–24 μm. Palpomeres 1–5 length/head width 0.79–0.92. Thorax. Antepronotum with 6–8 ventrolateral setae. Dorsocentrals 5–9, prealars 5–10, scutellars 17–23. Wing. R with 2–3 setae in basal 1/3, R 1 with 7–10 setae; R 4+5 with 5–8 setae in distal 1/3. Costa extension 49–66 μm long. RM length/MCu length 3.0–3.6. Brachiolum with 1–2 setae. Anal lobe well developed, angularly rounded. Squama with 29–36 setae 84–144 μm long. VR 0.88–0.94. Legs. Spur of fore tibia 60–64 μm long; spurs ...
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