Baetopus (Raptobaetopus) tenellus (Albarda, 1878)

Martynov, Alexander V., 2018, New records of some rare mayflies (Insecta, Ephemeroptera) from Ukraine, Ecologica Montenegrina 16, pp. 48-57 : 54

Baetopus (Raptobaetopus) tenellus (Albarda, 1878)

This transpalaearctic species is rare within all areal. Larvae are evidently predaceous ( Bauernfeind & Soldán 2012). One larva of B. tenellus ( Fig. 10 ) was registered in Styr River ( Figs 14, 15 ), the right tributary of the Prypyat’ River, at microhabitat with silted sand bottom and current velocity from 0.2 to 0.3 m /s. The additional parameters of waterbody in collecting place measured during the sampling were: water temperature 29°C, water hardness 259 ppm, pH 8.6. This is the first record of the genus Baetopus Keffermüller, 1960 , as well as the species B. tenellus within Ukraine.

Material: 1 larva, Ukraine, Rivne Region, vicinity of Stara Rafalivka village, Styr River , 51.378866, 25.863339, h – 156 m a.s.l., Martynov A. V. leg., 2.08.2017 – IN Riv 7 Btpten .

Figures

Figures 9–13. Larvae and imago of some registered species: 9. – Isonychia ignota (Walker, 1853), total view of larva, scale bar 2 mm; 10. – Baetopus tenellus (Albarda, 1878), total view of larva, scale bar 1 mm; 11. – Metreletus balcanicus (Ulmer, 1920), total view of larva, scale bar 2 mm; 12. – the same species, genitalia and posterior part of abdomen, male imago, ventral view, scale bar 1 mm; 13. – Brachycercus harrisella Curtis, 1834, total view of larva, scale bar 2 mm.

Figures 14–18. New collection sites of the investigated species within Ukraine: 14. – map showing new sites (red circles – Palingenia fuliginosa (Georgi, 1802); yellow circles – Isonychia ignota (Walker, 1853); green circle – Baetopus tenellus (Albarda, 1878); blue circles – Brachycercus harrisella Curtis, 1834; red quadrates – Siphlonurus aestivalis Eaton, 1903; yellow quadrate – Metreletus balcanicus (Ulmer, 1920)); 15. – Styr River, (vicinity of Stara Rafalivka village, July 2017); 16. – Stvyga River (vicinity of Poznan’ village, July 2017); 17. – bay of Desna River (vicinity of Prydesnyans’ke village, May 2017); 18. – Salva River (territory of Bukove village, May 2017).