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The bones of the postcranial skeleton are thick, having undergone pachyostosis. Mesosaurus is unusual among reptiles in that it possesses a cleithrum, usually found in more primitive bony fish and tetrapods. [13] The head of the interclavicle of Mesosaurus is triangular, unlike those of other early reptiles, which are diamond-shaped. [14]
Lower temporal fenestrae are so far known only in Mesosaurus, but may be present in all mesosaurs. The presence or absence of temporal fenestrae is an important consideration in the phylogeny of mesosaurs and other amniotes because the three major groups of amniotes -Synapsida, Diapsida, and Anapsida- have been named after the number of holes ...
Deutsch: Skelettabdrücke von Mesosaurus sp. in weißlich verwitternden Tonsteinen der Whitehill-Formation (Artinsk, Unterperm) bei Keetmanshoop im Südosten Namibias, Aranos-Becken English: Skeleton molds of Mesosaurus sp. in whitish weathering shales of the Whitehill Formation (Artinskian, Lower Permian) near Keetmanshoop in southeastern ...
"The postcranial skeleton of the aquatic parareptile Mesosaurus tenuidens from the Gondwanan Permian". Journal of Vertebrate Paleontology 30 (5): 1378-1395. Date
When studying the histology of the ribs of Stereosternum and Mesosaurus, the kind of pachyostosis of these two species has, is very much characterized by hyperostosis of the periosteal cortex, increased bone density, which was due to the bone becoming more compact, the absence of free medullary cavity and the remnants of calcified cartilage matrix.
The first is a well-preserved partial skeleton of a small M. missouriensis dated about 75 million years old with dismembered and punctured remains of a 1 meter (3.3 ft) long fish in its gut. This fish was much longer than the length of the mosasaur's skull, which measured 66 centimeters (26 in) in length, confirming that M. missouriensis ...
The Mangrullo Formation is part of the Cerro Largo Group of the Paraná Basin infill of South America. [5] Radiometric dating and fossil assemblage correlation with the Brazilian Irati Formation and the South African and Namibian Whitehill Formation, of the Paraná Basin and Karoo Basin respectively, puts it at around the Artinskian Age (about 279 ± 6 million years ago).
Mesosaurus skeleton, MacGregor, 1908 Fossil patterns across continents (Gondwanaland) Evidence for the movement of continents on tectonic plates is now extensive. Similar plant and animal fossils are found around the shores of different continents, suggesting that they were once joined.
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