Document Detail

Tyrannosaurid skeletal design first evolved at small body size.
MedLine Citation:
PMID:  19762599     Owner:  NLM     Status:  MEDLINE    
Nearly all of the large-bodied predators (>2.5 tons) on northern continents during the Late Cretaceous were tyrannosaurid dinosaurs. We show that their most conspicuous functional specializations--a proportionately large skull, incisiform premaxillary teeth, expanded jaw-closing musculature, diminutive forelimbs, and hindlimbs with cursorial proportions--were present in a new, small-bodied, basal tyrannosauroid from Lower Cretaceous rocks in northeastern China. These specializations, which were later scaled up in Late Cretaceous tyrannosaurids with body masses approaching 100 times greater, drove the most dominant radiation of macropredators of the Mesozoic.
Paul C Sereno; Lin Tan; Stephen L Brusatte; Henry J Kriegstein; Xijin Zhao; Karen Cloward
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-09-17
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  326     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-10-16     Completed Date:  2009-10-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  418-22     Citation Subset:  IM    
Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA.
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MeSH Terms
Body Size
Bone and Bones / anatomy & histology*
Cerebrum / anatomy & histology
Dinosaurs* / anatomy & histology,  classification
Forelimb / anatomy & histology
Hindlimb / anatomy & histology
Skull / anatomy & histology
Tooth / anatomy & histology
Comment In:
Science. 2009 Oct 16;326(5951):373-4   [PMID:  19833946 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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