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Chromosomes of two Brycon species (B. lundii and B. microlepis) and Salminus hilarii were analyzed. Based on constitutive heterochromatin distribution patterns, karyotypic relationships within and between Bryconinae and Salmininae were examined. A monophyletic origin for the genus Brycon, comprising at least two chromosome synapomorphies (presence of two large submetacentric bearing paracentromeric and telomeric heterochromatin), is suggested. Moreover, Bryconinae and Salmininae may represent a monophyletic unit among Characidae, as they share several chromosome features. Foram analisados os cromossomos de duas espécies de peixes do gênero Brycon (B. lundii e B. microlepis) e de Salminus hilarii. Principalmente baseado no padrão de distribuição da heterocromatina constitutiva, foram discutidas as relações cariotípicas dentro e entre os grupos Bryconinae e Salmininae. É sugerida uma origem monofilética para o gênero Brycon, com pelo menos duas sinapomorfias cromossômicas (presença de dois grandes submetacêntricos apresentando blocos pericentromérico e telomérico de heterocromatina constitutiva). Ainda, Bryconinae e Salmininae, compartilhando vários caracteres cromossômicos, podem formar uma unidade monofilética entre os Characidae, na qual outros caracídeos não estão incluídos

Heterochromatin patterns and karyotype relationships within and between the genera Brycon and Salminus (Pisces, Characidae)