Desmídias pseudofilamentosas na comunidade ficoperifítica do Reservatório de Rosana, Bacia do Rio Paranapanema, Brasil

(pseudofilamentous desmids of the phycoperiphytic community of the rosana reservoir, paranapanema river basin, brazil). this study aimed to make an inventory species of periphytic pseudofilamentous desmids from three regions of the rosana reservoir, southern brazil. samples were collected in autumn and winter periods at different sites along the river-dam axis of the reservoir (fluvial, intermediate and lacustrine regions). the substrates (petioles of eichhornia azurea kunt) were collected in the littoral. thirteen taxa of phycoperiphytic pseudofilamentous desmids (desmidiaceae) were distributed in five genera: desmidium c. agardh (3), hyalotheca ehrenberg (1), onychonema wallich (3), sphaerozosma corda ex ralfs (1) and spondylosium brébisson ex kützing (5). considering both sampling periods, in the lacustrine region it was recorded the highest number of species, i.e. eight in autumn and ten in winter. independently of the sampled period, pseudofilamentous desmids were not found in the fluvial region, well as in the intermediate region in the autumn.