ABSTRACT. Oligochaeta (Annelida) of continental aquatic environments from Mato Grosso do Sul (Brazil). This study aimed a survey of Oligochaeta species in three diff erent regions of Mato Grosso do Sul state (Baía, Ivinhema and Negro) in diverse environments (rivers, lakes, connecting channels). We recorded 41 Oligochaeta species, distributed in fi ve families (Narapidae, Haplotaxidae, Opistocystidae, Alluroididae, and Naididae). The study showed Oligochaeta richness in river Negro regions in relation of regions degraded by human action.
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