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The Dinosauria$
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David Weishampel

Print publication date: 2004

Print ISBN-13: 9780520242098

Published to California Scholarship Online: March 2012

DOI: 10.1525/california/9780520242098.001.0001

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PRINTED FROM CALIFORNIA SCHOLARSHIP ONLINE (www.california.universitypressscholarship.com). (c) Copyright University of California Press, 2017. All Rights Reserved. Under the terms of the licence agreement, an individual user may print out a PDF of a single chapter of a monograph in CALSO for personal use (for details see http://california.universitypressscholarship.com/page/535/privacy-policy-and-legal-notice).date: 23 October 2017

Basal Saurischia

Basal Saurischia

Chapter:
(p.25) Two Basal Saurischia
Source:
The Dinosauria
Author(s):

Max C. Langer

Publisher:
University of California Press
DOI:10.1525/california/9780520242098.003.0004

Saurischia is a stem-based clade defined as all dinosaurs more closely related to Allosaurus than to Stegosaurus. This chapter discusses the oldest known dinosaurs, which includes the basal saurischians, as well as various forms of uncertain affinity once assigned to the group. It examines the anatomy of basal saurischians such as Herrerasaurus ischigualastensis, Eoraptor lunensis, Staurikosaurus pricei and Guaibasaurus candelariensis. The chapter also presents a phylogenetic study of early dinosaur evolution based on the cladistic analysis of 107 anatomical characters, most of which were gathered from previous cladistic studies of Dinosauria.

Keywords:   Saurischia, Herrerasaurus ischigualastensis, Eoraptor lunensis, Staurikosaurus pricei, Guaibasaurus candelariensis, evolution, cladistic analysis, Dinosauria

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