The first record of dermochelyid turtles in the Eocene of Tierra del Fuego:new insights on the evolution of the Weddellian faunasOA北大核心
The first record of dermochelyid turtles in the Eocene of Tierra del Fuego:new insights on the evolution of the Weddellian faunas
The Antarctic Paleogene marine fossil record has been the key to reconstructing the evolution of the Weddellian Sea and final dismemberment of Southern Gondwana.In this context,Eocene marine vertebrates from Seymour(Marambio)Island have provided valuable information.We present the first Eocene record of marine reptiles from the southern Atlantic Coast of South America.This corresponds to several postcranial turtle remains represented by a proximal end of the right humerus,three caudal and one thoracic vertebrae,a fragment of the left pubis,and ten ossicles of the dorsal carapace,coming from the Leticia Formation(late-mid Eocene)at Cabo Tiburones,Tierra del Fuego,Argentina.These materials show several features such as the size and general morphology of the humerus and vertebrae,and the presence of relatively small,irregular,smooth,and unkeeled ossicles,which allow us to assign them to Dermochelyidae indet.Dermochelyids are a cosmopolitan group of cryptodiran turtles,registered from the late Cretaceous up to the recent,with some physiological-biological peculiarities(e.g.,endothermy and an exclusive jellyfish-based diet)and characterized by the presence of an osseous carapace formed by ossicles.The new finding from the Leticia Formation is an addition to the scarce and extremely fragmentary record of Eocene dermochelyids from the southern seas like those from the La Meseta and Submeseta formations(Antarctica)and the Waihao and Burnside formations(New Zealand).This new information allows us to discuss the presence of these turtles in such high latitudes in the past and its implication in the evolution of the Weddellian fauna.
Paula BONA;Juliana STERLI;Marcelo Saúl de la FUENTE;Eduardo OLIVERO;Marta S.FERNÁNDEZ;Marcelo REGUERO
División Paleontología Vertebrados,Museo de La Plata-Anexo Ⅱ,Facultad de Ciencias Naturales y Museo,Universidad Nacional de La Plata,La Plata B1900FWA,Argentina||Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET),Ciudad Autónoma de Buenos Aires C1425FQB,ArgentinaConsejo Nacional de Investigaciones Científicas y Técnicas(CONICET),Ciudad Autónoma de Buenos Aires C1425FQB,Argentina||Museo Paleontológico Egidio Feruglio,Trelew U9100,ArgentinaConsejo Nacional de Investigaciones Científicas y Técnicas(CONICET),Ciudad Autónoma de Buenos Aires C1425FQB,Argentina||Instituto de Evolución,Ecología Histórica y Ambiente-CONICET,San Rafael CP5600,ArgentinaConsejo Nacional de Investigaciones Científicas y Técnicas(CONICET),Ciudad Autónoma de Buenos Aires C1425FQB,Argentina||Centro Austral de Investigaciones Científicas-CONICET,Universidad Nacional de Tierra del Fuego,Ushuaia CP 9410,ArgentinaConsejo Nacional de Investigaciones Científicas y Técnicas(CONICET),Ciudad Autónoma de Buenos Aires C1425FQB,Argentina||División Paleontología Vertebrados,Museo de La Plata,Universidad Nacional de La Plata,La Plata B1900FWA,Argentina
marine reptilessea turtlesDermochelyidaePaleogeneLa Meseta FormationSubmeseta FormationLeticia Formation
《极地科学进展（英文版）》 2024 (001)
63-77 / 15
To M.Buono and C.Acosta Hospitaleche for the discussion on some of the issues discussed here,which improved the quality of this work.Ariel Aresti(Museo Egidio Feruglio,Trelew,Argentina)is thanked for the preparation of the thoracic vertebra.We thank Dr.Daphne Lee and Marcus Richard(Geology Museum,University of Otago,New Zealand)and Dr.Annelise Folie(Royal Belgian Institute of Natural Sciences,Museum of Natural Sciences,Brussels,Belgium)for providing photographs of the dermochelyid specimens under their care.Eugenia Raffi is specially thanked for her help during the study of this specimen in the CADIC.We also thank C.Acosta Hospitaleche for her invitation to participate in the Special Volume of"Advances in Polar Science".We acknowledge the revision of one anonymous reviewer and Dr.James Parham as reviewer whose comments help to improve the quality of this manuscript.Finally,we want to thank M.López Cabrera for her collaboration in the field work and to Z.Gasparini for her valuable contribution to this study.This research was partially funded by the Agencia Nacional de Promoción Científica y Tecnológica-Proyectos de Investigación Científica y Tecnológica-PICT 2017-0607(to M.Reguero)and PICT 2019-00327(to M.Buono).
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