Ankylopollexia
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Ankylopollexia is an extinct clade of ornithischian dinosaurs that lived from the Late Jurassic to the Late Cretaceous. It is a derived clade of iguanodontian ornithopods and contains the subgroup Sty
Life restoration of Iguanacolossus
Hand of Iguanodon, showing the distinctive thumb of the group
Brain endocast of an Iguanodon, created in 1897 from specimen NHMUK R2501
A 1905 diagram showing the small size of an Edmontosaurus annectens brain (bottom; alongside that of Triceratops horridus, top) commented on in early sources
Hadrosauroidea
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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
Ankylopollexia
…was named for its distinct robustness and large size, likely around 9 metres (30 ft) in length. Regarding hadrosaurs, one of the more basal members of Hadrosauroidea, the Chinese genus Bolong, is estimated to have been around 200 kilograms (440 lb). Another exception of this trend is Tethyshadros, a more derived…
Dinosaur Skeleton