 This, of course, does not automatically imply that they are closely related or that the genera are invalid.Rather, the authors point out, given the distinct and peculiar morphology of the two genera, incomplete lineage sorting or hybridization between ancestral individuals of the two species is a more likely explanation.According to their data, there must have been some extent of gene flow between "Mitu tuberosa" and "P. unicornis" around 2 mya.