Cytogenetic and dna content studies of armoured catfishes of the genus corydoras (pisces, siluriformes, callichthyidae) from the southeast coast of brazil - Oliveira, C.; Almeida-Toledo, Lurdes Foresti de; Mori, Lyria; Toledo Filho, Sílvio de Almeida (Revista Brasileira de Genetica = Brazilian Journal of Genetics, 1993)