Santos-Wisniewski, M. J., O. Rocha, A. M. Guntzel, and T. Matsumura-Tundisi. “Species Richness and Geographic Distribution of the Genera Chydorus and Pseudochydorus (Cladocera, Chydoridae) in São Paulo State”. Biota Neotropica, vol. 8, no. 1, Mar. 2008, //www.biotaneotropica.org.br/BN/article/view/388.