A new brachylophosaurin (Dinosauria: Hadrosauridae) from the Upper Cretaceous Menefee Formation of New Mexico.

Brachylophosaurini is a clade of hadrosaurid dinosaurs from the Campanian of western North America. Although well-known from northern localities in Montana and Alberta, including abundant material of and and the holotypes of and , material from southern localities in Utah and Colorado is restricted to a partial skull referred to . and several indeterminate specimens. Here we describe gen. et sp. nov., a new brachylophosaurin known from a partial skeleton from the Allison Member of the Menefee Formation in New Mexico. is the first brachylophosaurin reported from New Mexico and the southernmost occurrence of the clade. shares with and a caudally expanded nasofrontal suture on the frontals, but also exhibits an autapomorphic nasofrontal suture morphology, with a horizontal rostral region and elevated caudal region with two prominent parasagittal bumps, which is different from other brachylophosaurin specimens, including juvenile and adult . A phylogenetic analysis places in a trichotomy with and , with and as successive outgroups.