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First fossil frog from Antarctica: implications for Eocene high latitude climate conditions and Gondwanan cosmopolitanism of Australobatrachia
Responsible organisation
2020 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 10, no 1, article id 5051Article in journal (Refereed) Published
Abstract [en]

Cenozoic ectothermic continental tetrapods (amphibians and reptiles) have not been documented previously from Antarctica, in contrast to all other continents. Here we report a fossil ilium and an ornamented skull bone that can be attributed to the Recent, South American, anuran family Calyptocephalellidae or helmeted frogs, representing the first modern amphibian found in Antarctica. The two bone fragments were recovered in Eocene, approximately 40 million years old, sediments on Seymour Island, Antarctic Peninsula. The record of hyperossified calyptocephalellid frogs outside South America supports Gondwanan cosmopolitanism of the anuran clade Australobatrachia. Our results demonstrate that Eocene freshwater ecosystems in Antarctica provided habitats favourable for ectothermic vertebrates (with mean annual precipitation ≥900 mm, coldest month mean temperature ≥3.75 °C, and warmest month mean temperature ≥13.79 °C), at a time when there were at least ephemeral ice sheets existing on the highlands within the interior of the continent.

Place, publisher, year, edition, pages
Nature Publishing Group, 2020. Vol. 10, no 1, article id 5051
National Category
Zoology
Research subject
SWEDARP
Identifiers
URN: urn:nbn:se:polar:diva-8588DOI: 10.1038/s41598-020-61973-5OAI: oai:DiVA.org:polar-8588DiVA, id: diva2:1519055
Available from: 2021-01-18 Created: 2021-01-18 Last updated: 2022-09-15Bibliographically approved

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