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The knowledge of the diversity and distribution of  Hyalella  species is scarce in the subtropical regions of Brazil. The present study investigated the diversity and distribution of  Hyalella  species in subtropical temporary wetlands in the southern Brazilian Coastal Plain. Six species were registered in the study region, including three new species of the genus. The spatial distribution of the species in the study region suggests that the hydrographic region (or freshwater ecoregion) is an important driver of the geographic distribution of the species. Thus, the present study increases to 19 the diversity of species with distribution in the southern region, with one new record for the state of Santa Catarina, one for the state of Rio Grande do Sul, and one for both states. We also expanded the distribution ranges of  H. bonariensis, H. castroi , and  H. kaingang . In addition, we elaborated a taxonomic key to the species of  Hyalella  known to southern Brazil. Thus, we demonstrate the need for more taxonomic studies to better understand the diversity of macroinvertebrates in Brazilian wetlands, in order to protect our fauna and contribute to the development of future conservation policies.

studies on neotropical fauna and environment

Diversity and distribution of the genus  Hyalella  (Crustacea: Amphipoda: Hyalellidae) in temporary wetlands from the southern Brazilian Coastal Plain, with a taxonomic key to the species in the region