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Hadrosaurids (from Ancient Greek ἁδρός (hadrós) 'stout, thick' and σαύρα (saúra) 'lizard'), or hadrosaurs, are members of the ornithischian family Hadrosauridae. This group is known as the duck-billed dinosaurs for the flat duck-bill appearance of the bones in their snouts.
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.
Although subsequently treated as a synonym of Hadrosaurus, Prieto-Marquez et al. (2006) found Ornithotarsus to share no diagnostic traits with the H. foulkii holotype and declared it a nomen dubium undetermined beyond Hadrosauridae, and Brownstein (2021) agreed with this assessment. [2] [3]
Microhadrosaurus (meaning "small sturdy lizard" in Greek) is a genus of hadrosaurid dinosaur from the Campanian or Maastrichtian-age Upper Cretaceous Yuanpu Formation (also known as the Nanxiong Formation) of Guangdong, China.
Saurolophinae is a subfamily of hadrosaurid dinosaurs.It has since the mid-20th century generally been called the Hadrosaurinae, a group of largely non-crested hadrosaurs related to the crested sub-family Lambeosaurinae.
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Eotrachodon orientalis (meaning "dawn Trachodon from the east") is a species of hadrosaurid that was described in 2016.The holotype was found in the Mooreville Chalk Formation (Upper Santonian) in Alabama in 2007 and includes a well-preserved skull and partial skeleton, making it a rare find among dinosaurs of Appalachia.