New fossil findings of the mayfly genera Balticobaetisca Staniczek & Bechly, 2002 (Ephemeroptera: Baetiscidae) and Borinquena Traver, 1938 (Leptophlebiidae: Atalophlebiinae)

The well preserved male imago of a new species, Balticobaetisca stuttgardia sp. nov., is described and illustrated from Baltic amber (Eocene). The new species is the second representative of the previously monotypic fossil genus Balticobaetisca Staniczek & Bechly, 2002, so far only known from the species B. velteni Staniczek & Bechly, 2002 from Baltic amber (Eocene). Simultaneously, the second record of the fossil species Borinquena parva Staniczek, 2003 from Dominican amber (Miocene) is presented. Complementary descriptions and illustrations of the Studied specimens are given, and distinguishing characters and taxonomical data are discussed.