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Le Crétacé terminal de Beira Litoral, Portugal: remarques stratigraphiques et écologiques, étude complémentaire de Rosasia soutoi (Cbelonii, Bothremydidae)
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Resumo(s)
The synthetic study of the uppermost Cretaceous of the Beira Litoral
(fauna, floral confirms its upper Campanian-Maastrichtian age. It shows the presence of a tropical to subtropical climate in an area constituted by a low coastal plain only occasionally linked to the sea, saturared with fresh water
and possessing accordingly, a predominantely freshwater fauna (Viso, Aveiro); this plain changed towards the interior into a drier more forested zone with a more abundant terrestrial fauna which includes mammals
(Taveiro).
A thorough study of the chelonian Rosasia, abundant on the coastal plain, was made possible thanks to the discovery of a skull: it demonstrates that the genus belongs to the family Bothremydidae, revalided here. The
composition of this family is presented, its phylogenetic and paleobiogeographic
relation with the other pleurodires are analyzed, and its diagnosis established. The family is constituted of three groups; Rosasia belongs to one of rhese, the Bothremys group.
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Palavras-chave
Late Cretaceous Beira Litoral Ecology Rosasia Anatomy Skull Bothremydidae Pbylogenesis