TAXONOMIA DO GÊNERO Pinnularia EHRENBERG (BACILLARIOPHYCEAE) NO LAGO JURUCUÍ, BELTERRA, AMAZÔNIA, BRASIl

The present study aimed to carry out a floristic survey to know the taxonomic composition of the Pinnularia Ehrenberg genus (Bacillariophyceae) found in Jurucui lake, Belterra city, Para state. The study samples were obtained from the lake sediment, plankton and periphyton in June 2018. The results revealed the presence of 37 specific and infraspecific taxa (24 species, five varieties, two conferatum and six taxons identified at the generic level). Among these, P . amabilis and P . biceps are first records for the Brazilian Amazon region , and P . brauniana , P . interruptiformis , P . paradivergens , P . subgibba var. capitata and P . subgibba var. undulata are first records for the Para State. The analyzed specimens presented wide morphometric variations, and in some cases with differences in relation to the descriptions made in other works done for the Amazon, which contributes to the expansion of species identification characteristics. Keywords: diatoms; morphology; lentic environments; South America.