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Tyrannosaurid skeletal design first evolved at small body size. | LitMetric

Tyrannosaurid skeletal design first evolved at small body size.

Science

Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA.

Published: October 2009

AI Article Synopsis

Article Abstract

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.

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Source
http://dx.doi.org/10.1126/science.1177428DOI Listing

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