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Mauriciosaurus ("lagarto de Mauricio Ferná … Mauriciosaurus ("lagarto de Mauricio Fernández Garza") es un género extinto de plesiosauroide policotílido, que vivió en el Cretácico tardío, en lo que hoy es Nuevo León, en México. Medía cerca de 2 metros de longitud corporal y su principal atractivo es el gran estado de preservación que posee.el gran estado de preservación que posee.
, Mauriciosaurus (il cui nome significa "ret … Mauriciosaurus (il cui nome significa "rettile di Mauricio [Fernández Garza]") è un genere estinto di plesiosauro polycotylide vissuto nel Cretaceo superiore, circa 94-92 milioni di anni fa (Turoniano), in quello che oggi è il Messico. Il genere contiene una singola specie, ossia M. fernandezi, descritta nel 2017 da Eberhard Frey e colleghi da un singolo esemplare giovanile ben conservato lungo circa 1,9 metri. Dal punto di vista morfologico, nel complesso l'animale risulta essere molto più simile ai polycotylidi polycotylinae, come Trinacromerum e Dolichorhynchops. Tuttavia, diverse caratteristiche separano Mauriciosaurus da tutti gli altri polycotylidi, giustificando la denominazione di un nuovo genere. Questi includono il modello sofisticato di creste sul fondo dell'osso parasfenoide sul palato; le strette aperture nel palato delimitate dalle ossa pterigoidee; la mancanza di perforazioni sulla superficie del coracoide; e la disposizione insolita della gastralia, o costole del ventre, altrimenti osservabile solo in un altro plesiosauro non strettamente imparentato, Cryptoclidus. Parzialmente, come conseguenza dell'ambiente povero di ossigeno in cui l'esemplare si è conservato, l'esemplare tipo di Mauriciosaurus presenta impressioni di tessuti molli ben conservati. In vita, ognuna delle sue quattro pinne presentava un bordo di uscita flessibile in modo tale da formare una superficie mobile e idrodinamica, e il grasso presente intorno al suo corpo dava a quest'ultimo una forma idrodinamica a goccia unendo il busto e la coda immobile in una singola unità. Entrambi questi tratti dei tessuti molli avrebbero migliorato le prestazioni idrodinamiche dell'animale, rendendolo un nuotatore veloce paragonabile alle moderne tartarughe liuto. Inoltre, un rivestimento fortemente pigmentato proteggeva gli organi della cavità corporea dall'esposizione ai raggi UV. Dopo la morte, il sedimento ha permesso al grasso del corpo di conservarsi lungo tutto il corpo tranne che sul ventre. I depositi poveri di ossigeno in cui Mauriciosaurus si è conservato, noto collettivamente come il di Vallecillo, un tempo rappresentavano il fondo di una piattaforma continentale a circa 500 chilometri (310 miglia) al largo del Golfo del Messico preistorico. I bivalvi inoceramidici rappresentano l'unica fauna endemica bentonica del sito; altri organismi fossili conosciuti da Vallecillo includono invertebrati come ammoniti e cirripedi che crescevano sulle stesse ammoniti, così come i vertebrati costituiti da vari pesci, aigialosauridi e tartarughe. L'esemplare tipo di Mauriciosaurus è associato con l'ammonite , presente solo nell'intervallo Turoniano dei depositi di Vallecillo, permettendo di datarla a quell'età.cillo, permettendo di datarla a quell'età.
, Mauriciosaurus (meaning "Mauricio [Fernánd … Mauriciosaurus (meaning "Mauricio [Fernández Garza's] reptile") is a genus of polycotylid plesiosaur from the Late Cretaceous of Mexico. It contains a single species, M. fernandezi (also named after Fernández Garza), described in 2017 by Eberhard Frey and colleagues from a single well-preserved juvenile specimen about 1.9 metres (6 ft 3 in) long. Morphologically, it is overall most similar to the polycotyline polycotylids Trinacromerum and Dolichorhynchops. However, several features separate Mauriciosaurus from all other polycotylids, warranting the naming of a new genus. These include the sophisticated pattern of ridges on the bottom of the parasphenoid bone on its palate; the narrow openings in the palate bordered by the pterygoid bones; the lack of perforations in the surface of the coracoid; and the highly unusual arrangement of gastralia, or belly ribs, which is only otherwise seen in the non-polycotylid Cryptoclidus. Partially as a consequence of the oxygen-poor environment that the specimen was preserved in, the type specimen Mauriciosaurus is notable for possessing well-preserved soft-tissues. In life, each of its four flippers bore a flexible trailing edge such that they formed hydrofoils, and contour fat created a drop-like outline of the body by merging the torso and immobile tail into a single unit. Both of these soft-tissue traits would have improved the animal's hydrodynamic performance, making it a fast swimmer comparable to modern leatherback sea turtles. Additionally, a heavily-pigmented lining protected the organs of the body cavity from UV exposure. After death, the sediment allowed the contour fat to preserve into adipocere instead of putrefying, which preserved most of the epidermal soft tissue save for that of the belly. The oxygen-poor deposits that Mauriciosaurus was preserved in, collectively known as the Vallecillo plattenkalk, would have represented the bottom of a continental shelf about 500 kilometres (310 mi) offshore in the prehistoric Gulf of Mexico. Inoceramid bivalves represent the only endemic benthic fauna at the site; other fossil organisms known from Vallecillo include invertebrates such as ammonites and barnacles that grew on those ammonites, as well as vertebrates consisting of various fish, aigialosaurid mosasaurs, and turtles. The type specimen of Mauriciosaurus is associated with an ammonite, Mammites nodosoides, which is present only in the Turonian interval of the Vallecillo deposits, allowing it to be dated to that age.sits, allowing it to be dated to that age.
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Mauriciosaurus (il cui nome significa "ret … Mauriciosaurus (il cui nome significa "rettile di Mauricio [Fernández Garza]") è un genere estinto di plesiosauro polycotylide vissuto nel Cretaceo superiore, circa 94-92 milioni di anni fa (Turoniano), in quello che oggi è il Messico. Il genere contiene una singola specie, ossia M. fernandezi, descritta nel 2017 da Eberhard Frey e colleghi da un singolo esemplare giovanile ben conservato lungo circa 1,9 metri. Dal punto di vista morfologico, nel complesso l'animale risulta essere molto più simile ai polycotylidi polycotylinae, come Trinacromerum e Dolichorhynchops. Tuttavia, diverse caratteristiche separano Mauriciosaurus da tutti gli altri polycotylidi, giustificando la denominazione di un nuovo genere. Questi includono il modello sofisticato di creste sul fondo dell'osso parasfenoide sucreste sul fondo dell'osso parasfenoide su
, Mauriciosaurus ("lagarto de Mauricio Ferná … Mauriciosaurus ("lagarto de Mauricio Fernández Garza") es un género extinto de plesiosauroide policotílido, que vivió en el Cretácico tardío, en lo que hoy es Nuevo León, en México. Medía cerca de 2 metros de longitud corporal y su principal atractivo es el gran estado de preservación que posee.el gran estado de preservación que posee.
, Mauriciosaurus (meaning "Mauricio [Fernánd … Mauriciosaurus (meaning "Mauricio [Fernández Garza's] reptile") is a genus of polycotylid plesiosaur from the Late Cretaceous of Mexico. It contains a single species, M. fernandezi (also named after Fernández Garza), described in 2017 by Eberhard Frey and colleagues from a single well-preserved juvenile specimen about 1.9 metres (6 ft 3 in) long. Morphologically, it is overall most similar to the polycotyline polycotylids Trinacromerum and Dolichorhynchops. However, several features separate Mauriciosaurus from all other polycotylids, warranting the naming of a new genus. These include the sophisticated pattern of ridges on the bottom of the parasphenoid bone on its palate; the narrow openings in the palate bordered by the pterygoid bones; the lack of perforations in the surface of the cor of perforations in the surface of the cor
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Mauriciosaurus
, Mauriciosaurus fernandezi
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