Plesiotylosaurus, meaning "near Tylosaurus", is an extinct genus of marine lizard belonging to the mosasaur family. It is classified as part of the Mosasaurinae subfamily, alongside genera like Mosasaurus and Prognathodon. The genus contains one species, Plesiotylosaurus crassidens, recovered from deposits of Middle Maastrichtian age in the Moreno Formation in California.[1]
Though it is classified as a mosasaurine mosasaur, and not closely related to Tylosaurus, the name is not entirely misplaced as a number of cranial features found in the relatively intact holotype skull suggest some degree of convergent evolution with tylosaurine mosasaurs.[2]
^"Fossilworks: Plesiotylosaurus". fossilworks.org. Retrieved 17 December 2021.
^Lindgren, Johan (2009). "Cranial osteology of the giant mosasaur Plesiotylosaurus (Squamata, Mosasauridae)". Journal of Paleontology. 83 (3): 448–456. doi:10.1666/08-115.1. JSTOR 29739109.
skull of Plesiotylosaurus is amazingly similar to that of Prognathodon and had it not been for the prominent premaxillary rostrum of Plesiotylosaurus, the...
Plioplatecarpinae, but erected a tribe for the genus and the related Plesiotylosaurus, the Prognathodontini. He considered the mosasaurs within the Prognathodontini...
Prognathodontini (Prognathodon and its closest relatives, such as Plesiotylosaurus), is also used on occasion. "Clidastini" or the adjective "clidastine"...
group to Mosasaurus and Plotosaurus to instead be Eremiasaurus or Plesiotylosaurus depending on the method of data interpretation used, with at least...
It was named after United States president Barack Obama. †Plesiotylosaurus †Plesiotylosaurus crassidens California, USA †Plotosaurus †Plotosaurus tuckeri...
Tylosaurus nepaeolicus (6.18:1) among other mosasaurs, followed by Plesiotylosaurus (5.64:1) and Tylosaurus proriger (5.3:1). The snout bones of the premaxilla...
teeth have on occasion been compared to the genera Prognathodon and Plesiotylosaurus, both of which sometimes are included within the tribe. Said genera...
premaxilla is narrow and pointed forward, similar to Mosasaurus and Plesiotylosaurus. The maxilla is long and thin. Feeder foramina line the lateral surface...
though not as strongly built as it is in Mosasaurus, Prognathodon, or Plesiotylosaurus. The ventral margin of the dentary ranges from straight to slightly...
historically been more inclusive, on occasion including genera such as Plesiotylosaurus, Liodon and Clidastes, all of which are now seen as more basal mosasaurines...
from this fossil formation. They include Prognathodon, Halisaurus, Plesiotylosaurus, and Plotosaurus. Plesiosaurs that inhabited the Moreno Formation consisted...
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