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Title: An early nimravid from California and the rise of hypercarnivorous mammals after the Middle Eocene Climatic Optimum
Authors: Poust, Ashley W.
Barrett, Paul Z.
Tomiya, Susumu  kyouindb  KAKEN_id  orcid (unconfirmed)
Author's alias: 富谷, 進
Keywords: sabretooth
Eocene–Oligocene biotic transition
Issue Date: Oct-2022
Publisher: The Royal Society
Journal title: Biology Letters
Volume: 18
Issue: 10
Thesis number: 20220291
Abstract: Carnivoraforms (crown carnivorans and their closest relatives) first occupied hypercarnivorous niches near the dawn of the late Eocene, 40–37 million years ago. This followed the decline or extinction of earlier carnivorous groups, Mesonychia and Oxyaenodonta, leaving carnivoraforms and hyaenodontan meat-eaters as high trophic level consumers. The pattern of this change and the relative contributions of the taxonomic groups has hitherto been unclear. We report a new genus and species of the sabretoothed mammalian carnivore family Nimravidae, Pangurban egiae, from the Eocene Pomerado Conglomerate of southern California, with strongly derived hypercarnivorous features. While geochronologically the oldest named nimravid in North America, Pangurban egiae is recovered as phylogenetically derived, with affinities to Hoplophoneus. This provides unequivocal evidence for rapid radiation and spread of nimravid carnivores across Asia and North America and constrains the timing of early divergences within the family. Pangurban egiae narrows the gap between convergent iterations of sabretoothed mammalian carnivores and demonstrates swift diversification of the hypercarnivorous nimravids during a period of global climatic instability. Furthermore, it highlights the top-to-bottom restructuring North American ecosystems underwent during the Eocene–Oligocene transition, resulting in carnivoraforms taking positions as trophic specialists for the first time, a niche they still occupy today.
Description: Diego bows to ancestral sabretoothed mammal. 京都大学プレスリリース. 2022-10-17.
Rights: This is an accepted author manuscript of the following article:
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
DOI(Published Version): 10.1098/rsbl.2022.0291
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