Descripción y modelado 3D de una serie vertebral de alodaposúquido de Lo Hueco en el XXIII EJIP

Durante la pasada década, una serie de hallazgos fósiles en España han aumentado enormemente nuestro conocimiento sobre el grupo de cocodrilomorfos eusuquios denominados Allodaposuchidae, restringidos al Cretácico Superior de Europa. En particular, los restos hallados en el yacimiento de Lo Hueco (Cretácico Superior, Cuenca, España) permitieron la descripción de dos nuevas especies: Lohuecosuchus megadontos y Agaresuchus fontisensis. Este grupo es relevante por su potencial para entender la evolución temprana de Eusuchia y las tendencias evolutivas que permitieron la emergencia del plan corporal moderno eusuquio. Sin embargo, las características del esqueleto postcraneal de estos organismos todavía son bastante desconocidas. Así pues, en este trabajo se presenta la descripción morfológica de una serie vertebral de Lo Hueco y la identificación de dos morfotipos vertebrales en concordancia con los dos taxones presentes en dicha localidad. El resumen es el siguiente:

Allodaposuchidae is a group of Cretaceous eusuchian crocodylomorphs with a particularly rich fossil record in the Iberian Peninsula. In the past decade, several allodaposuchids have been described, including two species from the Late Cretaceous site of Lo Hueco, in Cuenca, Spain: Lohuecosuchus megadontos and Agaresuchus fontisensis. The Allodaposuchidae are significant for understanding the early evolution of Eusuchia, particularly during the peak of diversity for Crocodylomorpha at the late Cretaceous, and the evolutionary trends that led to the emergence of the modern Eusuchian body plan. Traditionally, taxonomical analyses of the group have mainly focused on the morphology of the skull, but recent studies have shown that the postcranial skeleton of crocodylomorphs, particularly eusuchians, exhibits a previously underestimated morphological and morphofunctional diversity. In addition, advanced analyses on mechanical properties and locomotion mechanics have emphasized a high degree of adaptative complexity related to the complex semi-aquatic ecological niche occupied by most members of the clade. In this sense, further analyses of the numerous postcranial remains of allodaposuchids from Lo Hueco are potentially relevant. This study presents the morphological description of a well-preserved vertebral series of five vertebrae from the cervicodorsal and dorsal regions, a comparison with other vertebrae from Lo Hueco, and its digitalization as 3D models with stereophotogrammetry. The series includes cervicodorsal vertebrae 3-4 and dorsal vertebrae 1-3. The morphological characterization of these vertebrae and their comparison with others indicate that two vertebral morphotypes of eusuchians are present at the site. This further supports the prior identification of two taxa of allodaposuchids in Lo Hueco from cranial remains, even if the vertebrae cannot be associated yet to any of those taxa. Moreover, this offers the possibility of enhancing the knowledge of the postcranial anatomy and the morphofunctional characteristics of the postcranial skeleton in allodaposuchids.

Más información:

• Referencia: Villanueva, A., De Celis, A., Narváez, I., Ortega, F. 2025. Description and 3D modeling of a vertebral series of Allodaposuchidae (Eusuchia) from Upper Cretaceous of Lo Hueco, Spain. XXIII Encuentro de Jóvenes Investigadores en Paleontología (EJIP), Buñol, Valencia.