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The hip bones of Spinosaurus were reduced, and the legs were very short in proportion to the body. Its long and narrow tail was deepened by tall, thin neural spines and elongated chevrons, forming a flexible fin or paddle-like structure. Spinosaurus is known to have eaten fish and small to medium terrestrial prey as well. [5]
The presence of this condition on the leg fragment showed that semi-aquatic adaptations in spinosaurids were already present at least 10 million years before Spinosaurus aegyptiacus appeared. According to the phylogenetic bracketing method, this high bone density might have been present in all spinosaurines. [ 29 ]
Date/Time Thumbnail Dimensions User Comment; current: 15:50, 12 April 2018: 5,389 × 1,807 (238 KB): PaleoGeekSquared: Simpler, clearer style overall. 04:38, 11 April ...
The authors also proposed Spinosaurus maroccanus as a junior synonym of Sigilmassasaurus, and rejected the proposal of a Spinosaurus aegyptiacus neotype. [4] A study by British paleontologist Thomas Arden and colleagues in 2018 concluded that Sigilmassasaurus was a valid genus and formed a tribe with Spinosaurus termed Spinosaurini.
A feature unique to dinosaurs and their immediate outgroups, it anchored the puboischiofemoralis muscles, which draw the hind leg forwards and inwards, and are therefore crucial for locomotion. Many early dinosaurs additionally have a bony ridge or muscle scar known as a trochanteric shelf , which extends from the base of the anterior ...
English: A size comparison of various specimens of the theropod dinosaur genus Spinosaurus. References: Ibrahim, Nizar & Sereno, Paul & Dal Sasso, Cristiano & Maganuco, Simone & Fabbri, Matteo & Martill, David & Zouhri, Samir & Myhrvold, Nathan & Iurino, Dawid. (2014). Semiaquatic adaptations in a giant predatory dinosaur.
Irritator is a genus of spinosaurid dinosaur that lived in what is now Brazil during the Albian stage of the Early Cretaceous Period, about 113 to 110 million years ago.It is known from a nearly complete skull found in the Romualdo Formation of the Araripe Basin.
In the modern fauna, theropods are represented by over 11,000 species of birds, which are a group of maniraptoran theropods within the clade Avialae.. Theropoda (/ θ ɪəˈr ɒ p ə d ə /; [2] from ancient Greek θηρίο-ποδός [θηρίον, (therion) "wild beast"; πούς, ποδός (pous, podos) "foot"]), commonly known as theropods, is an extant dinosaur clade that is ...