Miembros del Grupo de Biología Evolutiva de la UNED han presentado durante las XL Jornadas de la Sociedad Española de Paleontología (SEP) el trabajo titulado “The neck of the Spanish Upper Triassic simosaurid Paludidraco multidentatus (Sauropterygia): new anatomical information about the cervical region of Simosauridae”. En esta comunicación, se han mostrado resultados preliminares anatómicos sobre la región cervical de un nuevo ejemplar de este sauropterigio español. A continuación, os dejamos el resumen perteneciente a este trabajo:
The fossil record of simosaurs (Simosauridae, Eosauropterygia) is relatively more abundant in Europe than in the Middle East. However, it mainly consists of isolated and fragmentary remains that provide relatively limited anatomical information about this clade. Fortunately, few partially articulated and relatively complete skeletons, mainly corresponding to Simosaurus gaillardoti, from the Ladinian (Middle Triassic) of France and Germany, and to Paludidraco multidentatus, from the Carnian (Late Triassic) of Spain, have provided essential anatomical information about the postcranium of Simosauridae. Nonetheless, the cervical region is absent or poorly preserved for all these skeletons. Hence, the cervical region of the simosaurs is barely known relative to that of other Triassic eosauropterygians, the cervical number being known in several species of different clades. The exact cervical number present in simosaurs is unknown, S. gaillardoti has at least nine cervical vertebrae, based on the individual with the most complete neck region, and P. multidentatus exhibits a minimum of eleven cervicals based on the holotype (i.e., the only postcranium hitherto described). In this context, an unpublished specimen attributable to P. multidentatus, from its type locality (i.e., El Atance, Guadalajara, Central Spain), is presented here. It corresponds to a relatively complete and partially articulated postcranial skeleton preserving numerous cervical and dorsal elements, in addition to the pectoral girdle, and forelimb and hindlimb remains. The dorsal region is almost completely articulated, whereas all the preserved cervical elements are disarticulated. The new individual presents the most complete neck region of a simosaur so far known. In this study, we provide a detailed description of the P. multidentatus cervical region, considering the information provided by the new individual, in addition to a comparative anatomical study with the necks of S. gaillardoti and several representatives of Nothosauria (i.e., the sister taxon of Simosauridae).
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