Considering "hysilophodontids" were the ancestral Iguanodontoids it seems rather strange they were endotherms while their descendants,hadrosaurs,weren't.these findings onto a phylogeny of the Dinosauria suggests that endothermy most likely evolved among the Coelurosauria and, to a lesser extent, among the Hypsilophodontidae, but not among the Stegosauridae, Nodosauridae, Ankylosauridae, Hadrosauridae, Ceratopsidae, Prosauropoda, and Sauropoda.
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