Stempellinella Brundin, 1947 (Diptera: Chironomidae) from Eastern Siberia and the Russian Far East, with the description of new species Author Orel, Oksana V. text Zootaxa 2023 2023-12-01 5380 4 341 360 https://www.mapress.com/zt/article/download/zootaxa.5380.4.3/52392 journal article 10.11646/zootaxa.5380.4.3 1175-5326 10244718 34622C76-3DB5-4A47-ACA0-ED3DE6A6F909 Key to adult males of the genus Stempellinella from the Russian Far East and Eastern Siberia 1. Both tibial combs on mid and hind tibia with 1 spur. Median setae weak and short, located close to the anal point ( Figs. 5 , 40 , 45 ). Median volsella with simple stem, without microtrichia ( Figs 7 , 40 , 46 )...................................... 2 - Only one tibial comb on mid and hind tibia with spur. Medial setae strong and long, located far from the anal point ( Figs 15 , 50 ). Median volsella with palmate stem or lobe-shaped, with microtrichia ( Figs 16 , 51 )............................. 4 2. AR <0.7. Frontal tubercles small or absent. Median volsella long, S-shaped ( Fig. 40 ).......................................................................................... Stempellinella coronata Inoue, Kawai et Imabayashi - AR> 0.9. Frontal tubercles well developed, conical. Median volsella curved posterior ( Figs 7 , 46 ).................... 3 3. Superior volsella simple, oval form ( Fig. 46 ). Anal tergite with 3–5 small median tergite setae close to anal point ( Fig. 45 )..................................................................... Stempellinella edwardsi Spies et Saether - Superior volsella consist of 2–3 lobes bearing medial setae ( Figs 6–7 ). Anal tergite with 6–8 small median setae between anal crests ( Fig. 5 )............................................................... Stempellinella bazovae sp. nov. 4. Median volsella 35–45 μm long, with palmate stem and 7–10 lamellae ( Fig. 51 )........ Stempellinella tamaseptima (Sasa) - Median volsella oval or round shape, 21–30 μm long, with 10–15 small setae ( Fig. 16 )....... Stempellinella chirka sp. nov.