Document Detail

The oldest dinosaur? A Middle Triassic dinosauriform from Tanzania.
MedLine Citation:
PMID:  23221875     Owner:  NLM     Status:  MEDLINE    
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.
Sterling J Nesbitt; Paul M Barrett; Sarah Werning; Christian A Sidor; Alan J Charig
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2012-12-05
Journal Detail:
Title:  Biology letters     Volume:  9     ISSN:  1744-957X     ISO Abbreviation:  Biol. Lett.     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2012-12-10     Completed Date:  2013-05-09     Revised Date:  2014-02-25    
Medline Journal Info:
Nlm Unique ID:  101247722     Medline TA:  Biol Lett     Country:  England    
Other Details:
Languages:  eng     Pagination:  20120949     Citation Subset:  IM    
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MeSH Terms
Biological Evolution*
Dinosaurs / anatomy & histology*,  classification*,  genetics,  growth & development
Extinction, Biological
Humerus / anatomy & histology
Spine / anatomy & histology

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