Systematics of the catfish genera Nemuroglanis Eigenmann & Eigenmann 1889, Imparales Schultz 1944, and Medemichthys Dahl 1961 (Siluriformes: Pimelodidae: Heptapterinae) - Bockmann, Flávio Alicino; Ferraris Júnior, Carl J. (Annual Meeting of the American Society of Ichthyologists & Herpetologists, 2001)