In a 2019 re-evaluation of dacentrurine stegosaurids, Costa and Mateus suggested that, based on their revised diagnosis for the clade Dacentrurinae, Hesperosaurus appears to heave been closely related to Dacentrurus after all, though they refrained from formally reassigning it to that group pending the completion of an expanded phylogenetic analysis. Paleobiology In 2015, a study by Evan Thomas Saitta based on the finds in the JRDI 5ES Quarry concluded that Hesperosaurus showed sexual dimorphism. Plates found in the quarry came in two types: a taller one, and a low broad one. Though the back plates of the various individuals were not articulated, Saitta managed to order them into cervical, dorsal and caudal series for each type. This seemed to show that some individuals had tall plates exclusively while others bore broad plates only, which was confirmed by earlier specimens also possessing plates of one kind. Saitta suggested that the tall plates typified the females, while the males were equipped with low plates. The findings of the study were questioned by palaeontologists Kevin Padian and Kenneth Carpenter although no formal scientific studies were published as a rebuttal. See also Timeline of stegosaur research References Late Jurassic dinosaurs of North America Stegosaurs Dinosaurs of the Morrison Formation Fossil taxa described in 2001 Taxa named by Kenneth Carpenter Paleontology in Wyoming Paleontology in Montana Ornithischian genera