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Skull diagram of the basal sauropodomorph Massospondylus, showing the main skull openings (fenestra), including the external naris, the antorbital fenestra, the orbit, the infratemporal fenestra (here: lateral temporal fenestra), the supratemporal fenestra, and the mandibular fenestra. antorbital fenestra
The following outline is provided as an overview of and topical guide to dinosaurs: . Dinosaurs – diverse group of animals of the clade and superorder Dinosauria.They were the dominant terrestrial vertebrates for over 160 million years, from the late Triassic period (about in 1963) until the end of the Cretaceous (2000), when the Cretaceous–Paleogene extinction event led to the extinction ...
Dinosaurs are a diverse group of reptiles ... Labeled diagram of a typical archosaur ... Its anatomy indicated that it was an active predator that was likely warm ...
Regardless of the object's identity, it may have little relevance to dinosaurs' internal anatomy and metabolic rate. Both modern crocodilians and birds, the closest living relatives of dinosaurs, have four-chambered hearts, although modified in crocodilians, and so dinosaurs probably had them as well. However such hearts are not necessarily ...
Scale diagram comparing Carnotaurus to a human Carnotaurus was a large but lightly built predator. [ 17 ] The only known individual was about 7.5–8 m (24.6–26.2 ft) in length, [ H ] [ I ] [ 19 ] making Carnotaurus one of the largest abelisaurids.
This category is for pages relating to dinosaur anatomy, such as physical features or parts. For anatomic features which are not possessed solely by dinosaurian groups, (such as the Triceratops neck frill which is also employed by the Frill-necked Lizard ), they may be included if it is fairly evident or common in dinosaur anatomy overall.
In dinosaurs, the lacrimal bone usually defines the anterior rim of the orbit (eye socket), and the posterior rim of the antorbital fenestra. In some theropods (e.g. Allosaurus , Ceratosaurus , Albertosaurus ) the upper part of the lacrimal bone grew in such a manner as to form a horn on the top of the dinosaur's head, usually situated above ...
The anatomy of Pachycephalosaurus itself is poorly known, as only skull remains have been described. [10] Pachycephalosaurus is famous for having a large, bony dome on top of its skull, up to 25 cm (10 in) thick, which safely cushioned its brain. The dome's rear aspect was edged with bony knobs and short bony spikes projected upwards from the ...
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