Universidad Peruana Cayetano Heredia

Miocene fossils from the southeastern Pacific shed light on the last radiation of marine crocodylians

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dc.contributor.author Salas-Gismondi, R.
dc.contributor.author Ochoa, Diana
dc.contributor.author Jouve, S.
dc.contributor.author Romero, P.E.
dc.contributor.author Cardich Salazar, Jorge Aquiles
dc.contributor.author Perez Segovia, Alexander
dc.contributor.author Devries, T.
dc.contributor.author Baby, P.
dc.contributor.author Urbina, M.
dc.contributor.author Carré, Matthieu
dc.date.accessioned 2022-06-25T20:36:42Z
dc.date.available 2022-06-25T20:36:42Z
dc.date.issued 2022
dc.identifier.uri https://hdl.handle.net/20.500.12866/11858
dc.description.abstract The evolution of crocodylians as sea dwellers remains obscure because living representatives are basically freshwater inhabitants and fossil evidence lacks crucial aspects about crocodylian occupation of marine ecosystems. New fossils from marine deposits of Peru reveal that crocodylians were habitual coastal residents of the southeastern Pacific (SEP) for approximately 14 million years within the Miocene (ca 19 to 5 Ma), an epoch including the highest global peak of marine crocodylian diversity. The assemblage of the SEP comprised two long and slender-snouted (longirostrine) taxa of the Gavialidae: the giant Piscogavialis and a new early diverging species, Sacacosuchus cordovai. Although living gavialids (Gavialis and Tomistoma) are freshwater forms, this remarkable fossil record and a suite of evolutionary morphological analyses reveal that the whole evolution of marine crocodylians pertained to the gavialids and their stem relatives (Gavialoidea). This adaptive radiation produced two longirostrine ecomorphs with dissimilar trophic roles in seawaters and involved multiple transmarine dispersals to South America and most landmasses. Marine gavialoids were shallow sea dwellers, and their Cenozoic diversification was influenced by the availability of coastal habitats. Soon after the richness peak of the Miocene, gavialoid crocodylians disappeared from the sea, probably as part of the marine megafauna extinction of the Pliocene. en_US
dc.language.iso eng
dc.publisher Royal Society Publishing
dc.relation.ispartofseries Proceedings - Royal Society. Biological Sciences
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject longirostrine ecomorphs en_US
dc.subject biogeography en_US
dc.subject marine crocodylians en_US
dc.subject phylogenetics en_US
dc.subject Gavialoidea en_US
dc.title Miocene fossils from the southeastern Pacific shed light on the last radiation of marine crocodylians en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1098/rspb.2022.0380
dc.relation.issn 1471-2954


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