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Reptilia - Hadrosauridae
It was recombined as Trachodon perangulatus by Hay (1902); it was misspelled as Trachodon perangulus by Huene (1927); it was considered a nomen dubium by Lull and Wright (1942); it was considered a nomen dubium by Coombs (1988), Weishampel and Horner (1990) and Horner 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.