“…Species surveying is essential for understanding the biota of a given environment, specifically in Brazilian aquatic ecosystems where species diversity is poorly known due to the small number of taxonomists (ROCHA, 2003;AGOSTINHO et al, 2005). Although oligochaetes are among the most abundant species in sediments of Neotropical lakes and reservoirs, there is relatively poor ecological information, especially in comparison to the knowledge generated in temperate-zone habitats where these species are used to monitor water quality GELDER 1991, MARTIN et al, 2008, CHRISTOFFERSEN, 2010MARTIN 2015, RODRIGUES;ALVES 2018). The community composition and structure of the Class Oligochaeta provides important information for the assessment of water and sediment quality, and has therefore proved to be a great tool for aquatic biomonitoring (LAFONT, 1989;ROSSO, 1995;PRYGIEL et al, 2000;VIVIEN et al, 2014).…”