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Reptilia - Hadrosauridae
It was considered a nomen dubium by Lull and Wright (1942); it was considered a nomen dubium by Coombs and Galton (1988), Weishampel and Horner (1990), Dodson and Currie (1990), Horner et al. (2004) and Dodson et al. (2004).
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.