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- W3025971534 abstract "Our understanding of early metriorhynchid evolution, the highly specialised pelagic clade of Mesozoic crocodylomorphs, is hampered by the paucity of basal metriorhynchoids and how poorly preserved most of these fossils are. This means the transition from a ‘gharial-like’ body-plan to a ‘pseudo-dolphin-like’ one, which characterises metriorhynchoid evolution, is still poorly understood. Herein the Middle Jurassic taxon Teleidosaurus calvadosii (J.A. Eudes-Deslongchamps, 1866) is re-evaluated. The holotype of T. calvadosii was destroyed during World War Two, as were all referred specimens. All that survived are plaster casts of the holotype. However, a recently discovered specimen from the middle Bathonian of Ecouché, Normandy, France is herein referred to T. calvadosii. This specimen preserves the antorbital region, an incomplete mandible and one cervical vertebra. This specimen is designated as neotype of T. calvadosii. The new specimen allows to re-evaluate the anatomy of T. calvadosii, in particular the antorbital fenestra, which has been misunderstood. Moreover, a comparison is made between the French Middle Jurassic metriorhynchoids Teleidosaurus and Eoneustes. Both genera appear as valid and E. bathonicus is considered to be a nomen dubium. Notre compréhension de l’évolution précoce des Metriorhynchidae, le clade pélagique hautement spécialisé des crocodylomorphes mésozoïques, est entravée par le manque de ces fossiles. Cela signifie que la transition d’un plan corporel de type « gavial » à un « pseudo-dauphin », qui caractérise l’évolution des Metriorhynchidae, est encore mal comprise. Ce matériel commence à rectifier à cette question en réévaluant le taxon du Jurassique moyen Teleidosaurus calvadosii (J.A. Eudes-Deslongchamps, 1866). L’holotype de T. calvadosii a été détruit pendant la Seconde Guerre mondiale, comme tous les spécimens mentionnés. Tout ce qui a survécu sont des moulages en plâtre de l’holotype. Cependant, un spécimen a été récemment découvert dans le Bathonien moyen d’Ecouché, Normandie, France. Ce spécimen comporte la région antorbitale, une mandibule incomplète et une vertèbre cervicale. Ce spécimen est désigné comme néotype de T. calvadosii. Le nouveau spécimen permet de réévaluer l’anatomie de cette espèce, en particulier la fenêtre antéorbitaire qui a été mal comprise. De plus, grâce à ce matériel les genres Teleidosaurus et Eoneustes ont pu être comparés. Les deux genres sont considérés comme valides, et E. bathonicus comme un nomen dubium." @default.
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- W3025971534 date "2020-10-01" @default.
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- W3025971534 title "A new specimen of Teleidosaurus calvadosii (Eudes-Deslongchamps, 1866) (Crocodylia, Thalattosuchia) from the Middle Jurassic of France" @default.
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- W3025971534 doi "https://doi.org/10.1016/j.annpal.2020.102423" @default.
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