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Two New Species of Hyalella from Southern Brazil (Amphipoda: Hyalellidae) with a Taxonomic Key

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Abstract The freshwater amphipod genus Hyalella in Brazil has the second highest diversity in South America; it is only surpassed by the diversity found in the Andean Lake Titicaca. Ten species of Hyalella are known for Brazil: H. gracilicornis (Faxon, 1876); H. longistila (Faxon, 1876); H. warmingi Stebbing, 1899; H. meinerti Stebbing, 1899; H. curvispina Shoemaker, 1942; H. brasiliensis Bousfield, 1996; H. caeca Pereira, 1989; H. montenegrinae Bond-Buckup and Araujo, 1998; H. pseudoazteca González and Watling, 2003; and H. dielaii Pereira, 2004. Two new species are described here, H. castroi and H. pleoacuta, both occurring in freshwater bodies of southern Brazil over 1.200 m high in the region of Aparados da Serra. A key for the species of Hyalella from Brazil is presented.

Affiliations: 1: (ERG) Facultad de Ciencias del Mar, Universidad Católica del Norte, Casilla 117, Coquimbo, Chile; (Present address: Universidad Andrés Bello, República 440, Santiago, Chile,; (GBB, PBA) Departamento de Zoologia, Programa de Pós-Graduação, Biologia Animal, Instituto de Biociencias, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves, 9500, prédio 43435, 91501-970, Porto Alegre, Rio Grande do Sul, Brasil (,


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