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Bone samples from Leaellynasaura and Timimus, an ornithomimid about 3.5 metres (11 ft) long and 1.5 metres (4.9 ft) high at the hip, suggested these two dinosaurs had different ways of surviving the cold, dark winters: the Timimus sample had lines of arrested growth (LAGs for short; similar to growth rings), and it may have hibernated; but the ...
[2] The group was named by Jacques Gauthier in 1986 and originally had two main subgroups: Carnosauria and Coelurosauria, the clade containing birds and related dinosaurs such as compsognathids, tyrannosaurids, ornithomimosaurs, and maniraptorans. [4] The original Carnosauria was a polyphyletic group including any large carnivorous theropod. [5]
Ceratopsids are characterized by beaks, rows of shearing teeth in the back of the jaw, elaborate nasal horns, and a thin parietal-squamosal shelf that extends back and up into a frill. The group is divided into two subfamilies—Chasmosaurinae and Centrosaurinae. The chasmosaurines are generally characterized by long, triangular frills and well ...
All carnivorous dinosaurs (certain types of theropods) are traditionally classified as saurischians, as are all of the birds and one of the two primary lineages of herbivorous dinosaurs, the sauropodomorphs. At the end of the Cretaceous Period, all saurischians except birds became extinct in the course of the Cretaceous–Paleogene extinction ...
It is characteristic for archosauriforms, and present in most groups of dinosaurs. [25]: 40 manus The manus (plural: manus), or hand, comprises the carpals, metacarpals, and manual phalanges of the digits. [1]: 145 The first digit is the pollex (or thumb). [73] Meckelian groove The Meckelian groove is a longitudinal channel within the lower jaw.
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By the Late Cretaceous, one group of sauropods, the titanosaurs, had replaced all others and had a near-global distribution. However, as with all other non-avian dinosaurs alive at the time, the titanosaurs died out in the Cretaceous–Paleogene extinction event. Fossilised remains of sauropods have been found on every continent, including ...
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