Records of Ephemeroptera and Plecoptera from Lithuania, with notes on aquatic arthropods

This paper provides data on 52 Ephemeroptera and 21 Plecoptera species from Lithuania. Data of some other aquatic arthropods are also given. Baetis libenauae Keffermüller, 1974, B. pentaphlebodes Ujhelyi, 1966, Caenis lactea (Burmeister, 1839), C. robusta Eaton, 1884 (Ephemeroptera), Nemoura flexuosa Aubert, 1949 (Plecoptera) and Sialis fuliginosa Pictet, 1836 (Megaloptera) are new to Lithuania. First confirmed records of Oligoneuriella pallida (Hagen, 1855) are also given