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Services on Demand Journal. We arranged the karyotypes according to the size of chromosomes and sorted into metacentric m , submetacentric sm , subtelocentric st , and acrocentric a types, based on the criteria proposed by Levan et al. Additionally, we found a new karyomorph in P. The monophyly of the order Myliobatiformes, which includes the freshwater stingrays of the subfamily Potamotrygoninae, is well established Carvalho et al. Zool J Linnean Soc — Since we still do not know the karyotypes of Heliotrygon species, comparisons in this clade are not possible. Nat Geogr Soc Res Rep Sumner AT A simple technique for demonstrating centromeric heterochromatin. Cytogenetic studies in the subfamily Potamotrygoninae have provided valuable insights into the understanding of the evolution and diversification of its species.

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