Durante las XLI Jornadas de la Sociedad Española de Paleontología, celebradas en Puertollano del 30 de septiembre al 3 de octubre, los investigadores del Grupo de Biología Evolutiva de la UNED, María Gutiérrez Gálvez y Adán Pérez García, presentaron la comunicación titulada "Morphological characterization of the appendicular skeleton of the French Eocene pleurodiran turtle Neochelys arenarum (Podocnemididae)" en formato póster. En ella, se analizó el esqueleto apendicular de la tortuga pleurodira francesa Neochelys arenarum, que hasta ahora era solo conocida por su caparazón y cráneo. Siendo así el primer estudio respecto a su esqueleto apendicular, que fue comparado con otras formas del género Neochelys, así como otros taxones presentes en la biodiversidad actual. Esta investigación ha sido financiada por las Ayudas a la investigación de la SEP del año 2025. El resumen es el siguiente:
Neochelys arenarum is a podocnemidid turtle from the Ypresian (MP 7, early Eocene) of Rians (Var Department, Southwest France). Podocnemididae is a linage of Pleurodira known from the Late Cretaceous to the present, with eight species being part of the current biodiversity. This lineage has current geographical distribution limited to the southern hemisphere. However, its geographical distribution area was notably larger in warm periods of the past, especially during the Eocene, when the podocnemidids reached Europe, being relatively abundant and diverse there. The Eocene freshwater genus Neochelys was very successful in Europe, with nine species described. Neochelys arenarum is the oldest. All the Neochelys species are known for the shell, other skeletal remains being unknown for few of them, generally corresponding to the skull. Thus, information about the appendicular skeleton is only partially available for the German Lutetian (MP 11) Neochelys franzeni. In this sense, information on the appendicular skeleton of extinct pleurodires is extremely limited. We present here a characterization of several elements of the appendicular skeleton of Neochelys arenarum, including bones of the pectoral and pelvic girdles, as well as stylopodial and zeugopodial elements of both the forelimbs and hindlimbs. We compared its appendicular skeleton with whose of extant podocnemidids and with the scarce appendicular bones so far documented for extinct representatives. Furthermore, a detailed comparative study with other species of Neochelys is carried out, not only based on the scarce information previously published but especially on the first-hand study of unpublished appendicular material attributable to several representatives of the genus.
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