“…The higher diversity observed for the Lecanidae and Brachionidae families was also true for these families in the Pantanal Matogrossense (States of Mato Grosso do Sul and Mato Grosso) (Turner & da Silva, 1992;Bonecker et al, 1998b;Martínez et al, 2000), the floodplains of the Middle Paraná River (Argentine stretch) (José de Paggi, 1996), the Upper Paraná River (Brazilian stretch) (Sendacz, 1993), and the rivers Amazon (Robertson & Hardy, 1984;Bozelli, 1992), Orinoco (Twombly & Lewis Jr., 1987;Vásquez & Rey, 1989), Upper Orthon (Bolívia, Barbosa et al, 1999), and the Niger (Nigeria, Segers et al, 1993). The greatest occurrence of species of the genus Lecane in tropical regions was also mentioned by Koste & Shiel (1983), Bozelli (1992), Bonecker et al (1994), Dussart et al (1984), Dabés (1995), Koste (1999), Sharma & Sharma (2001).…”