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Mesosaurus (meaning "middle lizard") is an extinct genus of reptile from the Early Permian of southern Africa and South America. Along with it, the genera Brazilosaurus and Stereosternum , it is a member of the family Mesosauridae and the order Mesosauria .
Fossil of a South American Mesosaur. The study of Laurin and Reisz (1995) was the second major phylogenetic analysis of amniotes. [18] Like Gauthier et al., Laurin and Reisz used Reptilia as a crown group and placed mesosaurs outside the group.
Stereosternum had small teeth compared to Mesosaurus tenuidens, but it had larger teeth compared to Brazilosaurus sanpauloensis. The teeth of Stereosternum are 6 times the length of Brazilosaurus sanpauloensis, but has smaller teeth compared to Mesosaurus tenuidens, which has teeth that are 12 times longer than Brazilosaurus. [13]
Scale diagram comparing a human and the longest-known dinosaurs of five major clades An adult male bee hummingbird, the smallest known and the smallest living dinosaur. Size is an important aspect of dinosaur paleontology, of interest to both the general public and professional scientists.
Mosasaurus (/ ˌ m oʊ z ə ˈ s ɔːr ə s /; "lizard of the Meuse River") is the type genus (defining example) of the mosasaurs, an extinct group of aquatic squamate reptiles.It lived from about 82 to 66 million years ago during the Campanian and Maastrichtian stages of the Late Cretaceous.
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Brazilosaurus is an extinct genus of mesosaur which lived during the early Permian (Artinskian stage) of what is now Brazil.It is known from specimen BSPG 1965 I 131, a single skeleton recovered from the Assistencia Member of the Irati Formation (Hanayama Farm, Tatuí, São Paulo), in the Paraná Basin.
Mosasaurs (from Latin Mosa meaning the 'Meuse', and Greek σαύρος sauros meaning 'lizard') are an extinct group of large aquatic reptiles within the family Mosasauridae that lived during the Late Cretaceous.