Table 1. Comparisons among Edmontosaurus.

		PCF Edmontosaurus	E. annectens	E. regalis	Ontogenetic variation	Intraspecific variation	Lambeosauine possibility	Taxonomic validity
Character potentially differentiating the PCF Edmontosaurus from E. annectens and E. regalis
	Height/length ratio of maxilla	<0.34	>0.37	0.39	Ratio get smaller	Present	Absent	Possible
Characters potentially differentiating the PCF Edmontosaurus from E. annectens and E. regalis, but cannot be tested
	Lacrimal shape	Anteroposteriorly elongated, wedge-shaped	Robust, blunt anterior end	Robust, blunt anterior end	?	?	Unlikely	Dubious
	Bi-lobed ventral process of the predentary	Short	Long	Long	?	?	?	Dubious
	Ventral transverse ridge between the basipterygoid processes of the basisphenoid	Absent	Present	Present	?	Present	Possible	Dubious
	Secondary ridge of dentary teeth	Present	Absent	Absent	?	Present	Absent	Dubious