Information om | Engelska ordet ABELISAURIDS

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• The lacrimal and postorbital bones met to form a thick brow over the eye, as seen in carcharodontosaurids and the unrelated abelisaurids.
• The last definite known carnosaurs, the carcharodontosaurs, became extinct in the Turonian epoch of the Cretaceous, roughly 90 mya; reportedly later remains of carcharodontosaurids, from the late Maastrichtian (70–66 mya) Bauru Group in Brazil, were later interpreted as those of abelisaurids.
• The Lameta Formation has yielded several other dinosaur species, including abelisaurids and titanosaurian sauropods, similar to other Gondwanan landmasses.
• Past the Turonian, they were replaced by the smaller abelisaurids in Gondwana and by tyrannosaurids in North America and Asia.
• The earliest possible abelisaurid taxon is Eoabelisaurus mefi from the Jurassic period of Argentina, though other researchers either consider it as a ceratosaurid, an abelisauroid or its sister taxon outside abelisaurids.
• Initially regarded as an indeterminate theropod, later studies mentioned possible affinities with tyrannosaurids, abelisaurids, or carcharodontosaurids.
• It was then seen as the only known abelisaurid from the Northern Hemisphere apart from Betasuchus of the Maastrichtian of the Netherlands but since then more species of abelisaurids have been found in the northern hemisphere.
• Very thin and rod-like metatarsals II and IV (metatarsal II is reduced to a lesser extent in other noasaurids and some abelisaurids as well).
• The premaxillary bone is very tall, blunting the front of the snout, a feature which evolved convergently in abelisaurids.
• The hook-like shape of the cnemial crest suggests that Quilmesaurus was a member of the subfamily Carnotaurinae, which Sereno (1998) defined to include all abelisaurids closer to Carnotaurus than to Abelisaurus.
• This was to separate Arcovenator, Majungasaurus, Indosaurus, Rahiolisaurus, and Rajasaurus from South American abelisaurids based on physical characteristics such as elongated antorbital fenestrae in front of the eye sockets, and a sagittal crest that widens into a triangular surface towards the front of the head.
• Later, the noasaurids were recognised as close relatives of the larger abelisaurids; they are both derived from the same basal abelisauroid ancestor.
• Neuquensuchus shared its environment with a variety of animals, including snakes (Dinilysia), other crocodyliforms (Comahuesuchus, Cynodontosuchus, Notosuchus, and an unnamed form), and a variety of dinosaurs including abelisaurids, noasaurid (Velocisaurus), and alvarezsaurid (Alvarezsaurus) theropods, titanosaurians including Bonitasaura, and birds (Neuquenornis and Patagopteryx).
• Gres de Saint-Chinian outcrops in Département de L'Herault have produced dinosaur eggs, along with the indeterminate remains of avialans, enantiornithes, and possible indeterminate abelisaurids.
• Several dinosaurs have been described from the Lameta Formation, such as the noasaurid Laevisuchus; abelisaurids Indosaurus, Indosuchus, Lametasaurus, and Rajasaurus; and the titanosaurian sauropods Jainosaurus, Titanosaurus, and Isisaurus.
• The locality has also produced specimens of hadrosaurids, ankylosaurs, several titanosaur sauropods, several abelisaurids, indeterminate tetanurans, an incomplete large alvarezsaurid and a large unenlagiid.
• The existence of a derived ceratosaur at that time indicated a rapid diversification of ceratosaurs during that time period, as all the major ceratosaurian lineages (ceratosaurids, noasaurids, and abelisaurids) had already been established.
• They were surpassed only by large theropods, however, these are very rare in the Adamantina Formation and represented by isolated and fragmentary teeth mostly attributed to abelisaurids and carcharodontosaurids, and isolated megaraptorid and unenlagiine vertebrae.
• If it is an Allosauroid, this finding indicates that carnosaurs may have been subject to the same evolution of limb-reduction as tyrannosaurids and abelisaurids.
• Other Gondwanan continents, such as South America, India, and Madagascar show a similar combination of titanosaurians and abelisaurids in the latest Cretaceous, suggesting a distinct evolutionary history from the Laurasian continents of Asia and North America.

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