Floristic survey of Coscinodiscophyceae and Fragilariophyceae from superficial sediments of cascade reservoirs in the Paranapanema River is presented. Sediment samplings were gathered with dredge in three sampling stations of four reservoirs located in the upper Paranapanema River (Jurumirim and Chavantes reservoirs) and middle portion (Salto Grande and Capivara reservoirs), and in two sampling stations in the lower river (Rosana reservoir). Thirteen infrageneric taxa were identified, six of them belonging to class Coscinodiscophyceae and the other seven to Fragilariophyceae. Thalassiosira rudis Tremarin et al., Asterionella formosa Hass. var. formosa, Staurosirella martyi (Herib.) Morales & Manoylov, Staurosirella subcapitata (Freng.) Morales and Staurosira cf. acutirostrata Metz. & L.-B. were new records for the Paranapanema River Basin, and this was the second record of T. rudis worldwide.
algae; flora; reservoir; sediment
