New records of some rare mayflies (Insecta, Ephemeroptera) from Ukraine Author Martynov, Alexander V. text Ecologica Montenegrina 2018 2018-02-23 16 48 57 https://www.biotaxa.org/em/article/view/em.2018.16.6 journal article 54611 10.37828/em.2018.16.6 daad5c44-2db2-4e54-b6e2-89ba8a3937bb 2336-9744 8028193 Siphlonurus aestivalis Eaton, 1903 This species is rare in Ukraine . Previously it was known only from one point in Chernivtsi Region at the vicinity of Berehomet settlement (Martynov 2013). We registered S. aestivalis in two localities at the Desna River within Chernihiv Region ( Figs 14, 17 ). Habitat : In Chernivtsi Region larvae were collected at limnocrene (shallow draw-well). In contrast, in Chernihiv Region larvae of the species were collected in small well-warmed bay and the standing area along the bank of the Desna River. These microhabitats were located within the potamal zone of the river and characterized by the silted bottom densely overgrown with Agrostis stolonifera Linnaeus, 1753 ( Poaceae ) ( Fig. 17 ). Population density of S. aestivalis in grass thickets at the bay of the Desna River was 117 specimens /m 2 . Additional parameters of waterbody in sampling places were: water temperature 18°C, water hardness 160–181 ppm, pH 8.7–9.0. Material : Ukraine , Chernihiv Region : 232 larvae , vicinity of Prydesnyans’ke village , bay of Desna River , 51.613417 , 33.007583 , h – 118 m a.s.l. , Martynov A. V . leg., 1.05.2017 – IN Chg 11 Siphae /1–7 ; 29 larvae , vicinity of Sverdlovka village , Desna River , 51.772583 , 33.070317 , h ~ 125 m a.s.l. , Martynov A. V . leg., 1.05.2017 – IN Chg 12 Siphae .