Abstract
The monophyly of Batoidea is largely accepted and it is considered the superorder most diverse whithin Chondrichthyes, with about 640 valid species. The double copulatory organ (mixopterygia) is considered a synapomorphy of Chondrichthyes. The mixopterygia of family Rajidae is widely used in phylogenic and taxonomic study, being many taxons defined by shaped of mixopterygia components. Ho…