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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 ...
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 April 1944, the holotype of S. aegyptiacus was destroyed during an allied bombing raid in World War II. [16] [17] In 1934, Stromer referred a partial skeleton also from the Bahariya Formation to a new species of Spinosaurus; [18] the specimen has since been alternatively assigned to another African spinosaurid, Sigilmassasaurus. [19]
Spinosaurus (/ ˌ s p aɪ n ə ˈ s ɔːr ə s /; lit. ' spine lizard ') is a genus of spinosaurid dinosaur that lived in what now is North Africa during the Cenomanian stage of the Late Cretaceous period, about 100 to 94 million years ago.
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.
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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 ...
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