| Summary: | Chaetocladius spiridonovi sp. nov., Krasheninnikov urn:lsid:zoobank.org:act: FCCC4401-F3AD-4635-80B8-E3FBF42F3642 (Figs. 1–5) Chaetocladius sp. 7 ES| available from: http://boldsystems.org/index.php/Public_RecordView?processid=ATNA483-10 Material examined. Holotype, ♂, RUSSIA: Nenets Autonomous Okrug, Yugorsky Peninsula, cape Beliy Nos, lake, N 69,607361º E 60,211639º 6 m, 08.viii.2015, leg. Andrey B. Krasheninnikov (CCK). Paratypes, 5 ♂, same locality and data as for holotype; 1 ♂, RUSSIA: Nenets Autonomous Okrug, Vaygach Island, Lyamchin Peninsula, neighborhood of Cape Bolshoi Lyamchin Nose, stream, N 69,857806º E 59,147222º 4 m, 07.viii.2015, leg. Andrey B. Krasheninnikov (CCK). Derivatio nominis. The species is named ‘ spiridonovi ’ in honor of the Russian marine biologist Vasiliy A. Spiridonov (07.04.1957 – 17.12.2020), who devoted many years of his life in studying and preserving the region delimited by the polar latitudes. Description. Adult male (n = 3) Total length 2.9–3.1 mm, and abdomen 2.1–2.2 mm. Wing length 1.8–1.9 mm. Ratio total length/wing length 1.60–1.65. Head, thorax, abdomen and legs light brown. Head. Eye bare, reniform. Temporal setae 8–10 including inner and outer verticals and 1–2 postorbitals.Antenna with partly reduced plume, AR 0.74–0.77. Clypeus with 8–9 setae. Lengths (in μm) of palpomeres): 24–31; 27–43; 122–125; 86–106; 122–149. Thorax. Lateral antepronotals 4–7; dorsocentrals 10–12; acrostichals 13 (begin close to antepronotum), prealars 4–5. Scutellum with 5–9 setae. Wing. Brachiolum bare. Membrane with strong punctation under X400 magnification. R with 13–16, R 1 with 3–6, R 4+5 with 0–8 setae; other veins bare. Anal lobe slightly truncated. Costa extending to apex of R 4+5 on 15–30 μm. R 4+5 ending distal to end of M 3+4. R 2+3 weak. Squama with 3–5 setae. Legs. Fore tibia with 59 μm long spur; mid tibia with 31 μm and 24 μm long spurs; hind tibia (Fig. 5) with 47 μm and 24 μm long spurs. Hind tibial comb consists of 17 setae. Pseudospurs present on: ta 1 -ta 2 of P 2 and ta 1 ...
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