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The family Hadrosauridae was first used by Edward Drinker Cope in 1869, then containing only Hadrosaurus. [17] Since its creation, a major division has been recognized in the group between the hollow-crested subfamily Lambeosaurinae and the subfamily Saurolophinae, historically known as Hadrosaurinae. Both of these have been robustly supported ...
Hadrosauroidea is a clade or superfamily of ornithischian dinosaurs that includes the "duck-billed" dinosaurs, or Hadrosauridae, and all dinosaurs more closely related to them than to Iguanodon. Their remains have been recovered in Asia, Europe, Africa and the Americas.
Despite the fact that the family Hadrosauridae has Hadrosaurus as its type genus, the skeleton lacks a skull and was long viewed as too incomplete to compare to other hadrosaurs for classification purposes, leading most scientists to consider it a nomen dubium, or dubious name. [10]
Traditionally, the "crestless" branch of the family Hadrosauridae had been named Hadrosaurinae. However, the use of the term Hadrosaurinae was questioned in a comprehensive study of hadrosaurid relationships by Albert Prieto-Márquez in 2010.
Description of the fossil material of a tyrannosauroid theropod and an early member of the family Hadrosauridae from the Upper Cretaceous Merchantville Formation (Delaware and New Jersey, United States), possibly representing new taxa, and a study on the phylogenetic affinities of these dinosaurs is published by Brownstein (2021). [91]
Saurolophus (/ s ɔː ˈ r ɒ l ə f ə s /; meaning "lizard crest") is a genus of large hadrosaurid dinosaur from the Late Cretaceous period of Asia and North America, that lived in what is now the Horseshoe Canyon and Nemegt formations about 70 million to 66 million years ago.
Later in 1989, a study noted that features of its metacarpals could indicate a basal position within the Hadrosauridae. [4] [11] Near the turn of the century, in 1994, a review of Japanese dinosaurs noted the incomplete nature of many Asian hadrosaurs could mean some of them, including Nipponosaurus, may in fact be representatives of the same ...
Brachylophosaurus (/ b r ə ˌ k ɪ l ə f ə ˈ s ɔːr ə s / brə-KIL-ə-fə-SOR-əs or / ˌ b r æ k i ˌ l oʊ f ə ˈ s ɔː r ə s / brak-i-LOH-fə-SOR-əs; meaning "short-crested lizard", Greek brachys = short + lophos = crest + sauros = lizard, referring to its small crest) was a mid-sized member of the hadrosaurid family of dinosaurs.