Persistence of a Mesozoic, non-therian mammalian lineage (Gondwanatheria) in the mid-Paleogene of Patagonia.

Die Naturwissenschaften
Francisco J GoinMarcelo Reguero

Abstract

We describe two isolated molariforms recovered from early-middle Eocene (early Lutetian) levels of northwestern Patagonia, Argentina. Comparisons with major lineages of therian and non-therian mammals lead us to refer them to a new genus and species of Gondwanatheria (Allotheria). There is a single root supporting each tooth that is very short, wide, rounded, and covered by cementum; the steep sidewalls, lack of a neck between the crown and root, and the heavily worn stage in both molariforms suggest that they were of a protohypsodont type. Both teeth are strongly worn at their centers, all along their length, with the labial edge less worn than the lingual; they show strong transverse crests that alternate with lingual grooves. The protohypsodont aspect of the teeth, as well as the strong, transverse crests, are suggestive of sudamericid affinities; on the other hand, the thin enamel layer and the occlusal pattern formed by the crests and grooves shows more similarities to molariform teeth of the Ferugliotheriidae. The new taxon adds evidence regarding the (1) extensive radiation of the Gondwanatheria throughout the Southern Hemisphere, (2) persistence of several lineages well after the Cretaceous/Paleogene boundary, and (3) e...Continue Reading

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Citations

Nov 22, 2012·Proceedings of the National Academy of Sciences of the United States of America·Guillermo W RougierSebastian Apesteguía
Nov 11, 2014·Nature·David W KrauseHaingoson Andriamialison
Jan 29, 2013·Journal of Morphology·Anthony Michael Carter, Andrea Maria Mess
Oct 26, 2018·Annual Review of Entomology·Lorenza Beati, Hans Klompen
Nov 20, 2020·Die Naturwissenschaften·Nicolás R ChimentoFernando E Novas
May 19, 2021·Current Biology : CB·Neil BrocklehurstRoger B J Benson

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