15.10.24

Cocodrilos notosuquios del Eoceno de Zamora (sí, Zamora) en las XXXIX Jornadas de la SEP


En las pasadas XXXIX Jornadas de la Sociedad Española de Paleontología celebradas en A Coruña, se presentó una comunicación sobre cocodrilos notosuquios del Cenozoico ibérico. Los notosuquios son crocodyliformes muy alejados filogenéticamente de los cocodrilos modernos y su presencia en Europa se documenta a partir de restos muy fragmentarios recolectados en Portugal, España, Francia y Alemania, lo que no ha facilitado la interpretación del grupo en Europa. En esta comunicación se han presentado nuevos restos procedentes de Corrales del Vino (Zamora), muestreados en niveles de la Formación Corrales (Eoceno Medio, Luteciense). Estos restos aportan información anatómica relevante sobre los notosuquios del Eoceno de la Cuenca del Duero (en este caso del sector Zamora) y permite discutir el estatus taxonómico y filogenético de las formas del Duero en el contexto de los notosuquios del resto de Europa, África y América del Sur. El resumen de lo defendido en esta comunicación dice:

Notosuchian crocodyliforms have been known from the Europe Eocene since the 1960s. However, these finds generally corresponded to fragmentary remains collected in Portugal, Spain, France and Germany, so that their phylogenetic position was controversial. New remains from the Corrales del Vino site (Zamora, Spain), collected from levels of the Corrales Formation (Lutetian, Middle Eocene), are presented here. They comprise mainly disarticulated skull parts and isolated but well-preserved axial elements. Most of them are well ossified, so this condition indicates maturity. In addition, much smaller elements are also identified, such as a complete mandibular ramus with teeth, probably from juveniles. These new remains help to clarify some anatomical information that was not present in the previously recorded specimens from Zamora sites, and also complete the available material assigned to the Portuguese notosuchian Iberosuchus from other localities of the same formation (e.g. the El Viso-Madridanos fossil-site, also in the Zamora Province). The new material shows intraspecific variability, at least partially linked, most probably, with ontogenetic changes of this notosuchian species from Zamora. Recently, some new notosuchians species have been described from Spain and France (e.g. Doratodon, Ogresuchus and Dentaneosuchus), showing the biogeographic extension of these taxa in Europe from the Cretaceous to the Eocene, and several phylogenetic relationships between them and their putative Gondwanan relatives have been proposed. This contribution presents some new anatomical details for the notosuchian from the Eocene of Zamora and discusses its taxonomic and phylogenetic status in the context of the European, African and South American forms.

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