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

Autor:	Salas-Gismondi R; Facultad de Ciencias y Filosofía/Centro de Investigación para el Desarrollo Integral y Sostenible, Laboratorios de Investigación y Desarrollo, Universidad Peruana Cayetano Heredia, Lima, Perú.; Departamento de Paleontología de Vertebrados, Museo de Historia Natural, UNMSM, Lima, Perú.; Division of Paleontology, American Museum of Natural History, New York, NY 10024-5192, USA., Ochoa D; Facultad de Ciencias y Filosofía/Centro de Investigación para el Desarrollo Integral y Sostenible, Laboratorios de Investigación y Desarrollo, Universidad Peruana Cayetano Heredia, Lima, Perú., Jouve S; Centre de Recherche en Paléontologie-Paris (CR2P), Sorbonne Université, CNRS-MNHN-Sorbonne Université, 4 Place Jussieu, 75005 Paris, France., Romero PE; Facultad de Ciencias y Filosofía/Centro de Investigación para el Desarrollo Integral y Sostenible, Laboratorios de Investigación y Desarrollo, Universidad Peruana Cayetano Heredia, Lima, Perú., Cardich J; Facultad de Ciencias y Filosofía/Centro de Investigación para el Desarrollo Integral y Sostenible, Laboratorios de Investigación y Desarrollo, Universidad Peruana Cayetano Heredia, Lima, Perú., Perez A; Facultad de Ciencias y Filosofía/Centro de Investigación para el Desarrollo Integral y Sostenible, Laboratorios de Investigación y Desarrollo, Universidad Peruana Cayetano Heredia, Lima, Perú., DeVries T; Burke Museum of Natural History and Culture, University of Washington, Seattle, WA 98195, USA., Baby P; Géosciences- Environnements Toulouse, Université de Toulouse; UPS (SVT-OMP), CNRS, IRD, 14 Avenue Édouard Belin, F-31400 Toulouse, France., Urbina M; Departamento de Paleontología de Vertebrados, Museo de Historia Natural, UNMSM, Lima, Perú., Carré M; Facultad de Ciencias y Filosofía/Centro de Investigación para el Desarrollo Integral y Sostenible, Laboratorios de Investigación y Desarrollo, Universidad Peruana Cayetano Heredia, Lima, Perú.; LOCEAN Laboratory, UMR7159 (CNRS-IRD-MNHN-Sorbonnne Universités), Paris, France.
Jazyk:	angličtina
Zdroj:	Proceedings. Biological sciences [Proc Biol Sci] 2022 May 11; Vol. 289 (1974), pp. 20220380. Date of Electronic Publication: 2022 May 11.
DOI:	10.1098/rspb.2022.0380
Abstrakt:	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.
Databáze:	MEDLINE
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