期刊
BIOLOGY LETTERS
卷 9, 期 1, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rsbl.2012.0949
关键词
Dinosauria; Archosaur radiation; Triassic; Manda beds; phylogeny
资金
- NSF [EAR-1024036]
- NHMUK collections improvement grant
- Division Of Earth Sciences
- Directorate For Geosciences [1024036] Funding Source: National Science Foundation
The rise of dinosaurs was a major event in vertebrate history, but the timing of the origin and early diversification of the group remain poorly constrained. Here, we describe Nyasasaurus parringtoni gen. et sp. nov., which is identified as either the earliest known member of, or the sister-taxon to, Dinosauria. Nyasasaurus possesses a unique combination of dinosaur character states and an elevated growth rate similar to that of definitive early dinosaurs. It demonstrates that the initial dinosaur radiation occurred over a longer timescale than previously thought (possibly 15 Myr earlier), and that dinosaurs and their immediate relatives are better understood as part of a larger Middle Triassic archosauriform radiation. The African provenance of Nyasasaurus supports a southern Pangaean origin for Dinosauria.
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