Adelolophus

Adelolophus Temporal range: Late Cretaceous, 78 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Drawing of the holotype specimen
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	†Ornithischia
Clade:	†Ornithopoda
Family:	†Hadrosauridae
Subfamily:	†Lambeosaurinae
Tribe:	†Parasaurolophini
Genus:	†Adelolophus Gates et al., 2014
Species:	†A. hutchisoni
Binomial name
†Adelolophus hutchisoni Gates et al., 2014

Adelolophus (meaning "unknown crest") is a genus of lambeosaurine dinosaur (a crested "duck-bill") from Upper Cretaceous rocks in the U.S. state of Utah. The type and only known species is A. hutchisoni; the type specimen consists only of a broken maxilla. It constitutes the oldest known lambeosaur remains from North America, as well as the only known lambeosaur species from the Wahweap Formation, of which it pertains to the Upper Member. Among its relatives, it seems to be particularly similar to Parasaurolophus, rather than animals like Lambeosaurus; phylogenetic analysis confirms this, finding it in Parasaurolophini (tube-headed lambeosaurs). It would have lived in a wet environment, bordering on the sea but with a more arid season during some times of the year. This environment would have been shared with a diverse variety of fish and turtles, as well as other dinosaurs like ceratopsids and tyrannosaurids.