Haplocyclops Torresi n. sp. and Potamocaris estevesi reid, 1991 from Brazil, with a proposal for revalidation of the genus Haplocyclops Kiefer, 1952(Copepoda) - Rocha, Carlos Eduardo Falavigna da; Torres, Isabela Claret; Maia-Barbosa, Paulina Maria (Beaufortia, 1998)