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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.
Hadrosaurus (/ ˌ h æ d r ə ˈ s ɔːr ə s /; lit. ' bulky lizard ') is a genus of hadrosaurid ornithopod dinosaurs that lived in North America during the Late Cretaceous Period in what is now the Woodbury Formation in New Jersey about 83.6 to 77.9 Ma.
A study aiming to determine whether body size and ontogenetic age were strongly correlated in hadrosaurid dinosaurs from the Dinosaur Park Formation (Alberta, Canada), and to test the hypothesis of a rapid growth rate of hadrosaurids from the Dinosaur Park Formation relative to those from the Two Medicine Formation, is published by Wosik et al ...
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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Velafrons (meaning "sailed forehead") is a genus of lambeosaurine hadrosaurid dinosaur from the Late Cretaceous of Mexico.It is known from a mostly complete skull and partial skeleton of a juvenile individual, with a bony crest on the forehead.
Though hadrosaurid specimens from South America had been described before, Secernosaurus koeneri was the first species of South American hadrosaurid to be formally named. The genus name Secernosaurus means "separated reptile" [ 2 ] and comes from the Latin verb sēcernō , meaning to sever or divide, in reference to its geographic location ...