Search results
Results from the WOW.Com Content Network
A study on the taxonomic status of spinosaurs from the Kem Kem Group is published by Smyth, Ibrahim & Martill (2020), who consider Oxalaia quilombensis, Spinosaurus maroccanus, and Sigilmassasaurus brevicollis to be junior synonyms of Spinosaurus aegyptiacus. [141] Beevor et al. (2020) report a new locality near Tarda on the northern margin of ...
Spinosaurus (/ ˌ s p aɪ n ə ˈ s ɔːr ə s /; lit. ' spine lizard ') is a genus of large spinosaurid theropod dinosaurs that lived in what now is North Africa during the Cenomanian stage of the Late Cretaceous period, about 100 to 94 million years ago.
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.
In 2020, a paper by Robert Smyth and colleagues assessing spinosaurines from the Kem Kem Group did not find the autapomorphies of Oxalaia quilombensis sufficient to warrant a separate taxon, but instead considered them a result of individual variation. The authors thus considered the species a junior synonym of Spinosaurus aegyptiacus.
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 ]
[3] [4] [5] In recent years, research led by Ibrahim radically changed ideas about the morphology and life habits of one of the largest predatory dinosaurs, Spinosaurus aegyptiacus. [6] [7] Ibrahim also has interests in bioinformatics and contributed to the NSF-funded Phenoscape project. [8]
Spinosaurus aegyptiacus Later in 2019, the Khok Kruat Formation teeth were also referred to the Spinosaurinae by Kamonrak and colleagues, on the basis that both the Khok Kruat and Siamosaurus morphotypes lack characteristics seen in baryonychines, such as long and slender roots, 0–10 flutes on each side, no well defined carinae, a sculptured ...
Spinosaurid neck vertebrae distinct from known vertebrae of Spinosaurus aegyptiacus and exhibiting an unusual combination of positionally variable characters are described from the Kem Kem Group by McFeeters (2021), who interprets this finding as evidence of a greater degree of intraspecific variation in the vertebrae of S. aegyptiacus than ...