首页|Contributions to the knowledge of Antarctodon sobrali(Mammalia:Astrapotheria)from the Eocene of Antarctica

Contributions to the knowledge of Antarctodon sobrali(Mammalia:Astrapotheria)from the Eocene of Antarctica

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The Astrapotheria constitutes one of the five orders of extinct South American native ungulates,with a fossil record that also extends to the Eocene of the Antarctic Peninsula.In contrast to the abundant specimens known for litoptern Sparnotheriodontidae and metatherians,astrapotheres are represented by scant remains assigned to the endemic Antarctodon sobrali and indeterminate astrapotheres,restricted to levels 35Cu0 and 35n of the Cucullaea I Allomember of the La Meseta Formation.The discovery of a lower molar assignable to this species in the Eocene levels of Seymour(Marambio)Island,enables a revision of the diagnosis and the homologies of the dental characters used to describe this taxon.A reanalysis of its phylogenetic relationships reveals the nearly simultaneous presence of basal astrapotheres in the early Eocene of Itaboraí(Brazil),Patagonia,and West Antarctica.These taxa are characterized by lacking dental specializations usually associated with more abrasive diets like terminal forms of Uruguaytheriinae and Astrapotheriinae.Antarctodon appears to have thrived on the Antarctic continent during the Early Eocene Climatic Optimum within the paleoclimatic context of a hot-house world.Unlike present conditions in Antarctica where no terrestrial mammals inhabit,the early Eocene climate was characterized by warmer temperatures and a biologically diverse environment rich in primary producers,dominated by Nothofagus forests,encompassing both deciduous and evergreen forests,which supported a diverse assemblage of continental vertebrates.

AstrapotheriaAntarctodonEoceneSeymour IslandLa Meseta Formation

Javier N.GELFO

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Consejo Nacional de Investigaciones Científicasy Técnicas(CONICET),Buenos Aires C1425FQB,Argentina

División Paleontología Vertebrados,Museo de La Plata,Facultad de Ciencias Naturales y Museo de La Plata,Universidad Nacional de La Plata,La Plata B1900FWA,Argentina

Editorial Office of the journal Advances in Polar ScienceMarcelo Reguero for the opportunities provided within the framework of the Antarctic projectsMarcelo Reguero for the opportunities provided within the framework of the Antarctic projects

PICT 0607-2018UNLP 11N812

2024

10.12429/j.advps.2023.0031

极地科学进展(英文版)
中国极地研究中心,国家海洋局极地考察办公室 (Polar Research Institute of China, Chinese Arctic and Antarctic Administration)

极地科学进展(英文版)

影响因子：0.145
ISSN：1674-9928
年,卷(期)：2024.34(1)
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