En la última década, el yacimiento de Lo Hueco, en Cuenca, ha sido de gran importancia para entender las faunas europeas de cocodrilos durante el Cretácico Superior. Hasta ahora, solamente se habían descrito restos pertenecientes a Allodaposuchidae, con dos nuevas especies definidas a partir de material fósil procedente de esta localidad. Sin embargo, en el curso de recientes revisiones de algunos elementos postcraneales de cocodrilos del yacimiento, se ha descubierto un enigmático resto que puede alterar esta imagen. En este trabajo se estudia dicho resto, llegando a la conclusión de que pertenece a un individuo en etapas muy avanzadas del desarrollo ontogenético y en consecuencia, por su morfología distinta a otros restos y su pequeño tamaño, debe pertenecer a un tercer neosuquio indeterminado no identificado. El resumen de este trabajo es el siguiente:
The neosuchian faunas recorded in Ibero-Armorican deposits from the Campanian-Maastrichtian, such as Laño, Chera, and the Tremp Basin, include a wide diversity of taxa belonging to groups like Allodaposuchidae, Hylaeochampsidae, Atoposauridae and, possibly, Paralligatoridae. As Lo Hueco site (Cuenca) is geochronologically and palaeobiogeographically comparable to these sites, a similar neosuchian fauna would be expected there. However, only allodaposuchid remains have been identified at Lo Hueco so far, belonging to two species. Nevertheless, a thorough study of the crocodyliform postcranial record from this site might overturn this scenario.Based on size, several of the analyzed appendicular remains are not definitively attributable to Allodaposuchidae, even if they do belong to relatively mature specimens. The most interesting of these is a small humerus, about 15 cm long, whose overall shape differs from that of the other humeri from Lo Hueco. Despite its small size, it presents characters indicative of a relatively advanced ontogenetic stage. The rugosity of the Musculus scapulohumeralis can be observed, the capitulum is present, and the insertions of the M. teres major and the M. latissimus dorsi are well developed. Its morphology is comparable to that of an indeterminate eusuchian humerus from Laño, which preserves the proximal half and belonged to a mature individual.In this context, this fossil likely belongs to a third, yet unidentified, neosuchian at Lo Hueco. This finding represents another example of coexistence of at least three crocodyliform species, a pattern common in the fossil record and some modern ecosystems. The presence of small, gracile forms at Lo Hueco may reflect ecological differentiation among coexisting herpetofauna. These results highlight the potential of postcranial remains to reveal previously unrecognized crocodyliform diversity in Late Cretaceous European ecosystems.
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Más información:
- Referencia: Villanueva, A., de Celis, A., Narváez, I., Ortega, F. (2026) Postcranial evidence reveals greater neosuchian diversity at Lo Hueco (Late Cretaceous, Cuenca). Libro de resúmenes del XXIV Encuentro de Jóvenes Investigadores en Paleontología (EJIP), Bogarra, Albacete.




























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