A peculiar faunivorous metatherian from the early Eocene of Australia

Beck, RMD

Abstract

I describe Archaeonothos henkgodthelpi gen. et. sp. nov., a small (estimated body mass ~40-80g) tribosphenic metatherian from the early Eocene Tingamarra Fauna of southeastern Queensland, Australia. This taxon, known only from a single isolated upper molar (M2 or M3) is characterised by a very distinctive combination of dental features that, collectively, probably represent faunivorous adaptations. These include: a straight, elevated centrocrista; a metacone considerably taller than the paracone; a wide stylar shelf (~50% of the total labiolingual width of the tooth); reduced stylar cusps; a long postmetacrista; a small and anteroposteriorly narrow protocone; an unbasined trigon; and the absence of conules. Some of these features are seen in dasyuromorphians, but detailed comparisons reveal key differences between A. henkgodthelpi and all known members of this clade. A. henkgodthelpi also predates recent molecular estimates for the divergence of crown-group Dasyuromorphia. Similar dental features are seen in a number of other metatherians, including the South American sparassodonts, Wirunodon chanku from the ?Middle-Late Eocene Santa Rosa local fauna of Peru, and Kasserinotherium tunisiense from the Early Eocene Chambi fauna of Tunisia, although whether A. henkgodthelpi is closely related to any of these taxa is unclear based on available evidence. I therefore refer A. henkgodthelpi to Metatheria incertae sedis. Potential relatives of A. henkgodthelpi are unknown from any other Australian fossil deposit.

Citation

Beck, R. (2013). A peculiar faunivorous metatherian from the early Eocene of Australia. Acta palaeontologica Polonica, 60(1), 123-129. https://doi.org/10.4202/app.2013.0011

• Journal Article Type: Article
• Acceptance Date: Jun 5, 2013
• Publication Date: Jun 6, 2013
• Deposit Date: Feb 24, 2015
• Publicly Available Date: Nov 23, 2016
• Journal: Acta Palaeontologica Polonica
• Print ISSN: 0567-7920
• Publisher: Polskiej Akademii Nauk, Instytut Paleobiologii
• Peer Reviewed: Peer Reviewed
• Volume: 60
• Issue: 1
• Pages: 123-129
• DOI: https://doi.org/10.4202/app.2013.0011
• Publisher URL: http://dx.doi.org/10.4202/app.2013.0011
• Related Public URLs: http://www.app.pan.pl/home.html
• Additional Information: Funders : Leverhulme Trust;Australian Research Council;National Science Foundation; Projects : Study Abroad Studentship;Using ancient fossils and new methods to unravel Australian mammal evolution in deep time; Grant Number: SAS/30110; Grant Number: DE120100957; Grant Number: DEB0743039