Desmídias (Zygnematophyceae) de hábito filamentoso da região do Vale do Paranã (Goiás, Brasil)

Abstract

The region of the Paranã Valley is part of the Cerrado biome and Tocantins-Araguaia basin (Goiás state, Brazil). The study constitutes the first work for the region and aims to present the inventory of filamentous desmid forms. 102 samples were coleted in the rainy and dry seasons though different methods. The algae had been analyzed and microphotographed and identified. The qualitative analysis resulted in 17 taxa. Hyalotheca dissiliens var. dissiliens f. dissiliens was most frequent in the rainy while in the dry period Spondylosium panduriforme var. panduriforme f. panduriforme and Spondylosium panduriforme var. limneticum. The floodplain environment had been most propitious for filamentous desmid and 71% of taxa were exclusive of this environment. The sampling station of Formosa presented the most specific richness with 94,1% of taxa filamentous desmid. There were registered eight new taxa to the state of Goiás.