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A 2008 study of one skeleton of the hadrosaur Hypacrosaurus concluded that this dinosaur grew even faster, reaching its full size at the age of about 15; the main evidence was the number and spacing of growth rings in its bones. The authors found this consistent with a life-cycle theory that prey species should grow faster than their predators ...
The word dinosaur is commonly used to refer only to non-avian dinosaurs, reflecting an outdated conception of the ancestry of avian dinosaurs, the birds. The evolutionary origin of birds was an open question in paleontology for over a century , but the modern scientific consensus is that birds evolved from small feathered theropods in the ...
This has enabled multiple full-body reconstructions of dinosaur colouration, such as for Sinosauropteryx [83] and Psittacosaurus [84] by Jakob Vinther and colleagues, and similar techniques have also been extended to dinosaur fossils from other localities. [80] (However, some researchers have also suggested that fossilized melanosomes represent ...
The Princeton Field Guide to Dinosaurs is a reference work on dinosaurs written by the paleontologist and paleoartist Gregory S. Paul. It was first published by Princeton University Press in 2010. In the United Kingdom it was published by A & C Black under the title Dinosaurs: A Field Guide. [1] [2] An updated second edition was released in ...
Thyreophora ("shield bearers", often known simply as "armored dinosaurs") is a group of armored ornithischian dinosaurs that lived from the Early Jurassic until the end of the Cretaceous. Thyreophorans are characterized by the presence of body armor lined up in longitudinal rows along the body.
This is an accepted version of this page This is the latest accepted revision, reviewed on 18 December 2024. There is 1 pending revision awaiting review. Clade containing most theropod dinosaurs Tetanurans Temporal range: Early Jurassic – Present, 201–0 Ma Pre๊ ๊ O S D C P T J K Pg N Six tetanurans (top left to bottom right): Monolophosaurus in combat with non-tetanuran dinosaur ...
Dinosauromorpha is a clade of avemetatarsalians (archosaurs closer to birds than to crocodilians) that includes the Dinosauria (dinosaurs) and some of their close relatives. It was originally defined to include dinosauriforms and lagerpetids, [3] with later formulations specifically excluding pterosaurs from the group. [4]
Spinosauridae (or spinosaurids) is a clade or family of tetanuran theropod dinosaurs comprising ten to seventeen known genera.Spinosaurid fossils have been recovered worldwide, including Africa, Europe, South America and Asia.