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The karyotypes of Mycteria americana (Ciconiidae) and Platalea ajaja (Threskiornithidae) are described. Both species have a diploid number of 2n = 72. There are slight chromosome morphology differences, which could be related to distinct chromosome evolution pathways of these two families. Besides a better understanding of the chromosome relationships among Ciconiiformes, this first chromosome characterization of M. americana and P. ajaja is an important tool for the conservation of both species. No presente trabalho foram descritos os cariótipos de Mycteria americana (Ciconiidae) e Platalea ajaja (Threskiornithidae). Embora ambas as espécies tenham apresentado o número diplóide 2n = 72, foram observadas diferenças na morfologia cariotípica resultantes de processos evolutivos distintos que parecem ocorrer entre as duas famílias. Além de contribuir para um melhor entendimento da evolução cromossômica dentro da ordem Ciconiiformes, a caracterização cariotípica de M. americana e P. ajaja vem representar uma importante ferramenta para a realização de planos de manejo e conservação destas espécies

genetics and molecular biology

First karyotypical description of two American Ciconiiform birds, Mycteria americana (Ciconiidae) and Platalea ajaja (Threskiornithidae) and its significance for the chromosome evolutionary and biological conservation approaches