The aim of this study was to evaluate the benthic diatom composition from the estuary sediment in the Pernambuco State. based on 32 samples. Samples were collected monthly from September through December 1999 (dry period) and from April through July 2000 (rainy period) during four pre established sampling stations. Results indicated 19 families and 31 specific and infraspecific taxa. https://www.lightemupsequences.com/