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Craniata is an unranked group of chordate animals that contains the vertebrates (subphylum Vertebrata) and hagfish (Myxini), which are sometimes grouped under Vertebrata. Craniata includes all animals with skulls, hence the name. Craniata is the new monophyletic taxa replacing the older Linnean classification of vertebrates. The main difference of this new taxa is the inclusion of the Myxini and Cephalaspidomorphi classes. Traditionally these two classes were excluded from vertebrate taxon because of the lack of vertebrae. However because they have a cranium they are included into the Craniata taxon (Hickman et al., 2007).