Читать книгу Hadrosaurs - David A. Eberth - Страница 59

By tradition, these latter taxa are placed within the clade Hadrosauridae. The clade Euhadrosauria was originally proposed by Weishampel et al. (1993) and was diagnosed at that time on the basis of five unambiguous and two ambiguous synapomorphies. This node-based clade may be defined using phylogenetic nomenclature protocol as Saurolophus and Parasaurolophus, their most common ancestor, and all of its descendants.