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The Origin and Early Evolution of Dinosaurs
Biol. Rev. (2010), 85, pp. 55–110. 55 doi:10.1111/j.1469-185X.2009.00094.x The origin and early evolution of dinosaurs Max C. Langer1∗,MartinD.Ezcurra2, Jonathas S. Bittencourt1 and Fernando E. Novas2,3 1Departamento de Biologia, FFCLRP, Universidade de S˜ao Paulo; Av. Bandeirantes 3900, Ribeir˜ao Preto-SP, Brazil 2Laboratorio de Anatomia Comparada y Evoluci´on de los Vertebrados, Museo Argentino de Ciencias Naturales ‘‘Bernardino Rivadavia’’, Avda. Angel Gallardo 470, Cdad. de Buenos Aires, Argentina 3CONICET (Consejo Nacional de Investigaciones Cient´ıficas y T´ecnicas); Avda. Rivadavia 1917 - Cdad. de Buenos Aires, Argentina (Received 28 November 2008; revised 09 July 2009; accepted 14 July 2009) ABSTRACT The oldest unequivocal records of Dinosauria were unearthed from Late Triassic rocks (approximately 230 Ma) accumulated over extensional rift basins in southwestern Pangea. The better known of these are Herrerasaurus ischigualastensis, Pisanosaurus mertii, Eoraptor lunensis,andPanphagia protos from the Ischigualasto Formation, Argentina, and Staurikosaurus pricei and Saturnalia tupiniquim from the Santa Maria Formation, Brazil. No uncontroversial dinosaur body fossils are known from older strata, but the Middle Triassic origin of the lineage may be inferred from both the footprint record and its sister-group relation to Ladinian basal dinosauromorphs. These include the typical Marasuchus lilloensis, more basal forms such as Lagerpeton and Dromomeron, as well as silesaurids: a possibly monophyletic group composed of Mid-Late Triassic forms that may represent immediate sister taxa to dinosaurs. The first phylogenetic definition to fit the current understanding of Dinosauria as a node-based taxon solely composed of mutually exclusive Saurischia and Ornithischia was given as ‘‘all descendants of the most recent common ancestor of birds and Triceratops’’. -
The Sauropodomorph Biostratigraphy of the Elliot Formation of Southern Africa: Tracking the Evolution of Sauropodomorpha Across the Triassic–Jurassic Boundary
Editors' choice The sauropodomorph biostratigraphy of the Elliot Formation of southern Africa: Tracking the evolution of Sauropodomorpha across the Triassic–Jurassic boundary BLAIR W. MCPHEE, EMESE M. BORDY, LARA SCISCIO, and JONAH N. CHOINIERE McPhee, B.W., Bordy, E.M., Sciscio, L., and Choiniere, J.N. 2017. The sauropodomorph biostratigraphy of the Elliot Formation of southern Africa: Tracking the evolution of Sauropodomorpha across the Triassic–Jurassic boundary. Acta Palaeontologica Polonica 62 (3): 441–465. The latest Triassic is notable for coinciding with the dramatic decline of many previously dominant groups, followed by the rapid radiation of Dinosauria in the Early Jurassic. Among the most common terrestrial vertebrates from this time, sauropodomorph dinosaurs provide an important insight into the changing dynamics of the biota across the Triassic–Jurassic boundary. The Elliot Formation of South Africa and Lesotho preserves the richest assemblage of sauropodomorphs known from this age, and is a key index assemblage for biostratigraphic correlations with other simi- larly-aged global terrestrial deposits. Past assessments of Elliot Formation biostratigraphy were hampered by an overly simplistic biozonation scheme which divided it into a lower “Euskelosaurus” Range Zone and an upper Massospondylus Range Zone. Here we revise the zonation of the Elliot Formation by: (i) synthesizing the last three decades’ worth of fossil discoveries, taxonomic revision, and lithostratigraphic investigation; and (ii) systematically reappraising the strati- graphic provenance of important fossil locations. We then use our revised stratigraphic information in conjunction with phylogenetic character data to assess morphological disparity between Late Triassic and Early Jurassic sauropodomorph taxa. Our results demonstrate that the Early Jurassic upper Elliot Formation is considerably more taxonomically and morphologically diverse than previously thought. -
Upper Cretaceous), Brazil
Rev. Mus. Argentino Cienc. Nat., n.s. 7(1): 31-36, 2005 Buenos Aires, ISSN 1514-5158 Maniraptoran theropod ungual from the Marília Formation (Upper Cretaceous), Brazil Fernando E. NOVAS1, Luiz Carlos BORGES RIBEIRO2,3 & Ismar de SOUZA CARVALHO4 1CONICET - Museo Argentino de Ciencias Naturales «Bernardino Rivadavia», Av. Angel Gallardo 470, Buenos Aires (1405), Argentina, E-mail: [email protected]. 2Fundação Municipal de Ensino Superior de Uberaba- FUMESU/Centro de Pesquisas Paleontológicas L. I. Price. Av. Randolfo Borges Jr., n° 1.250. Universidade, 38.066-005, Uberaba- MG, Brazil, E-mail: [email protected]. 3Universidade de Uberaba-UNIUBE/Instituto de Formação de Educadores-Departamento de Biologia, Av. Nenê Sabino, n° 1.801. Universitário, Uberaba-MG, 38.055-500, Brazil, E-mail: [email protected]. 4Universidade Federal do Rio de Janeiro, Departamento de Geologia, CCMN/IGEO. 21.949-900 Cidade Universitária-Ilha do Fundão, Rio de Janeiro-RJ, Brazil, E-mail: [email protected] Abstract: A new theropod record from the Marília Formation (Late Cretaceous, Minas Gerais, Brazil) is here described. It consists of an isolated manual ungual which exhibits derived maniraptoran features (e.g., presence of proximodorsal lip). The ungual distinguishes by a set of unique features (e.g., dorsoventrally low and proximodistally elongate profile in side view; block-like flexor tuberosity; proximal articular surface more dorsally oriented than in other theropods; cutting «keel» located distally on ventral surface) suggesting that the animal that produced it was a member of an unknown group of derived maniraptoran theropods, other than alvarezsaurids, deinonychosaurians and oviraptorosaurians already recorded in South America. -
The Anatomy and Phylogenetic Relationships of Antetonitrus Ingenipes (Sauropodiformes, Dinosauria): Implications for the Origins of Sauropoda
THE ANATOMY AND PHYLOGENETIC RELATIONSHIPS OF ANTETONITRUS INGENIPES (SAUROPODIFORMES, DINOSAURIA): IMPLICATIONS FOR THE ORIGINS OF SAUROPODA Blair McPhee A dissertation submitted to the Faculty of Science, University of the Witwatersrand, in partial fulfilment of the requirements for the degree of Master of Science. Johannesburg, 2013 i ii ABSTRACT A thorough description and cladistic analysis of the Antetonitrus ingenipes type material sheds further light on the stepwise acquisition of sauropodan traits just prior to the Triassic/Jurassic boundary. Although the forelimb of Antetonitrus and other closely related sauropododomorph taxa retains the plesiomorphic morphology typical of a mobile grasping structure, the changes in the weight-bearing dynamics of both the musculature and the architecture of the hindlimb document the progressive shift towards a sauropodan form of graviportal locomotion. Nonetheless, the presence of hypertrophied muscle attachment sites in Antetonitrus suggests the retention of an intermediary form of facultative bipedality. The term Sauropodiformes is adopted here and given a novel definition intended to capture those transitional sauropodomorph taxa occupying a contiguous position on the pectinate line towards Sauropoda. The early record of sauropod diversification and evolution is re- examined in light of the paraphyletic consensus that has emerged regarding the ‘Prosauropoda’ in recent years. iii ACKNOWLEDGEMENTS First, I would like to express sincere gratitude to Adam Yates for providing me with the opportunity to do ‘real’ palaeontology, and also for gladly sharing his considerable knowledge on sauropodomorph osteology and phylogenetics. This project would not have been possible without the continued (and continual) support (both emotionally and financially) of my parents, Alf and Glenda McPhee – Thank you. -
And Early Jurassic Sediments, and Patterns of the Triassic-Jurassic
and Early Jurassic sediments, and patterns of the Triassic-Jurassic PAUL E. OLSEN AND tetrapod transition HANS-DIETER SUES Introduction parent answer was that the supposed mass extinc- The Late Triassic-Early Jurassic boundary is fre- tions in the tetrapod record were largely an artifact quently cited as one of the thirteen or so episodes of incorrect or questionable biostratigraphic corre- of major extinctions that punctuate Phanerozoic his- lations. On reexamining the problem, we have come tory (Colbert 1958; Newell 1967; Hallam 1981; Raup to realize that the kinds of patterns revealed by look- and Sepkoski 1982, 1984). These times of apparent ing at the change in taxonomic composition through decimation stand out as one class of the great events time also profoundly depend on the taxonomic levels in the history of life. and the sampling intervals examined. We address Renewed interest in the pattern of mass ex- those problems in this chapter. We have now found tinctions through time has stimulated novel and com- that there does indeed appear to be some sort of prehensive attempts to relate these patterns to other extinction event, but it cannot be examined at the terrestrial and extraterrestrial phenomena (see usual coarse levels of resolution. It requires new fine- Chapter 24). The Triassic-Jurassic boundary takes scaled documentation of specific faunal and floral on special significance in this light. First, the faunal transitions. transitions have been cited as even greater in mag- Stratigraphic correlation of geographically dis- nitude than those of the Cretaceous or the Permian junct rocks and assemblages predetermines our per- (Colbert 1958; Hallam 1981; see also Chapter 24). -
The Pelvic and Hind Limb Anatomy of the Stem-Sauropodomorph Saturnalia Tupiniquim (Late Triassic, Brazil)
PaleoBios 23(2):1–30, July 15, 2003 © 2003 University of California Museum of Paleontology The pelvic and hind limb anatomy of the stem-sauropodomorph Saturnalia tupiniquim (Late Triassic, Brazil) MAX CARDOSO LANGER Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, BS8 1RJ Bristol, UK. Current address: Departamento de Biologia, Universidade de São Paulo (USP), Av. Bandeirantes, 3900 14040-901 Ribeirão Preto, SP, Brazil; [email protected] Three partial skeletons allow a nearly complete description of the sacrum, pelvic girdle, and hind limb of the stem- sauropodomorph Saturnalia tupiniquim, from the Late Triassic Santa Maria Formation, South Brazil. The new morphological data gathered from these specimens considerably improves our knowledge of the anatomy of basal dinosaurs, providing the basis for a reassessment of various morphological transformations that occurred in the early evolution of these reptiles. These include an increase in the number of sacral vertebrae, the development of a brevis fossa, the perforation of the acetabulum, the inturning of the femoral head, as well as various modifications in the insertion of the iliofemoral musculature and the tibio-tarsal articulation. In addition, the reconstruction of the pelvic musculature of Saturnalia, along with a study of its locomotion pattern, indicates that the hind limb of early dinosaurs did not perform only a fore-and-aft stiff rotation in the parasagittal plane, but that lateral and medial movements of the leg were also present and important. INTRODUCTION sisting of most of the presacral vertebral series, both sides Saturnalia tupiniquim was described in a preliminary of the pectoral girdle, right humerus, partial right ulna, right fashion by Langer et al. -
104Ornithodiraphyl
Millions of Years Ago 252.3 247.2 235.0 201.5 175.6 161.2 145.5 99.6 65.5 Triassic Jurassic Cretaceous Early Middle Late Early Middle Late Early Late Euparkeria Crurotarsi ? Scleromochlus ? Archosauria Pterosauria Lagerpetidae Ornithodira Marasuchus Genasauria Dinosauromorpha Silesauridae Neornithsichia Thyreophora Ornithischia Eocursor (esp. Dinosauria) et al. (2011), Yates (2007) Yates et al. (2011), Nesbitt etal.(2009), Sues (2007), Martinezet al.(2011), Irmis etal. Ezcurra (2006), EzcurraandBrusatte (2011), Phylogeny after Brusatteetal.(2010), Butleretal.(2007), Heterodontosauridae Pisanosaurus Dinosauria Ornithodira Sauropodomorpha Herrerasauria Saurischia Eodromeus Theropoda Daemonosaurus Tawa Neotheropoda Millions of Years Ago 253.0 247.2 235.0 201.5 175.6 161.2 145.5 99.6 65.5 Triassic Jurassic Cretaceous Early Middle Late Early Middle Late Early Late (2009), Norman et al. (2004), Thompson etal. (2011) (2009), Norman etal. (2004), Phylogeny afterButler etal. (2007a,b), Carpenter (2001),Galton &Upchurch (2004), Maidment etal.(2008), Mateus etal. Cerapoda Ornithopoda Eocursor Marginocephalia Neornithischia Othnielosaurus Genasauria (esp. Thyreophora) Genasauria (esp. Hexinlusaurus Stormbergia Genasauria Lesothosaurus Scutellosaurus Thyreophora Scelidosaurus Stegosauridae Stegosaurinae Dacentrurinae Stegosauria Kentrosaurus Tuojiangosaurus Huayangosauridae Gigantspinosaurus Eurypoda Tianchiasaurus Ankylosauria Nodosauridae Ankylosauridae Millions of Years Ago 253.0 247.2 235.0 201.5 175.6 161.2 145.5 99.6 65.5 Triassic Jurassic Cretaceous -
What Really Happened in the Late Triassic?
Historical Biology, 1991, Vol. 5, pp. 263-278 © 1991 Harwood Academic Publishers, GmbH Reprints available directly from the publisher Printed in the United Kingdom Photocopying permitted by license only WHAT REALLY HAPPENED IN THE LATE TRIASSIC? MICHAEL J. BENTON Department of Geology, University of Bristol, Bristol, BS8 1RJ, U.K. (Received January 7, 1991) Major extinctions occurred both in the sea and on land during the Late Triassic in two major phases, in the middle to late Carnian and, 12-17 Myr later, at the Triassic-Jurassic boundary. Many recent reports have discounted the role of the earlier event, suggesting that it is (1) an artefact of a subsequent gap in the record, (2) a complex turnover phenomenon, or (3) local to Europe. These three views are disputed, with evidence from both the marine and terrestrial realms. New data on terrestrial tetrapods suggests that the late Carnian event was more important than the end-Triassic event. For tetrapods, the end-Triassic extinction was a whimper that was followed by the radiation of five families of dinosaurs and mammal- like reptiles, while the late Carnian event saw the disappearance of nine diverse families, and subsequent radiation of 13 families of turtles, crocodilomorphs, pterosaurs, dinosaurs, lepidosaurs and mammals. Also, for many groups of marine animals, the Carnian event marked a more significant turning point in diversification than did the end-Triassic event. KEY WORDS: Triassic, mass extinction, tetrapod, dinosaur, macroevolution, fauna. INTRODUCTION Most studies of mass extinction identify a major event in the Late Triassic, usually placed at the Triassic-Jurassic boundary. -
Teacher's Pre- and Post-Program Visit Guide
Teacher’s Pre- and Post-Program Visit Guide Program Dinosaur Discovery Grade Level 1 - 5 Time 50 minutes Location Museum of Natural History & Science Classrooms and Dino Hall Program Objectives Students will use various dinosaur bones and parts to develop categorizing skills. Students will work collaboratively with peers to solve problems and come to a conclusion about the classification of a dinosaur. Students will be able to compare and contrast carnivores and herbivores based on factors they learn in the lab. Program Description Become a paleontologist and explore the size and bone structure of dinosaurs while using the „tools of the trade‟, including fossil replicas. This program includes a guided experience in the Museum of Natural History & Science‟s Dino Hall. Major Vocabulary and concepts carnivore herbivore paleontologist fossil Allosaurus pterosaurs Compsognathus T. Rex Stegosaurus gastroliths Brachiosaurus Suggested things to do in your classroom before the program Research dinosaurs and chart their size relationships. Include the dinosaurs we will be focusing on in class – Compsognathus, Allosaurus, Stegosaurus, T. Rex, and Brachiosaurus. Look at some common items such as scissors, a steak knife and a grinder and compare these items to teeth that do a similar job. Humans have three types of teeth, incisors for cutting/snipping (scissors); canines for stabbing/slicing (steak knife); and molars for grinding and crunching (grinder). Have them look at pictures of dinosaurs and decide which kind of teeth each animal has. Use a -
Cranial Anatomy of Allosaurus Jimmadseni, a New Species from the Lower Part of the Morrison Formation (Upper Jurassic) of Western North America
Cranial anatomy of Allosaurus jimmadseni, a new species from the lower part of the Morrison Formation (Upper Jurassic) of Western North America Daniel J. Chure1,2,* and Mark A. Loewen3,4,* 1 Dinosaur National Monument (retired), Jensen, UT, USA 2 Independent Researcher, Jensen, UT, USA 3 Natural History Museum of Utah, University of Utah, Salt Lake City, UT, USA 4 Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, USA * These authors contributed equally to this work. ABSTRACT Allosaurus is one of the best known theropod dinosaurs from the Jurassic and a crucial taxon in phylogenetic analyses. On the basis of an in-depth, firsthand study of the bulk of Allosaurus specimens housed in North American institutions, we describe here a new theropod dinosaur from the Upper Jurassic Morrison Formation of Western North America, Allosaurus jimmadseni sp. nov., based upon a remarkably complete articulated skeleton and skull and a second specimen with an articulated skull and associated skeleton. The present study also assigns several other specimens to this new species, Allosaurus jimmadseni, which is characterized by a number of autapomorphies present on the dermal skull roof and additional characters present in the postcrania. In particular, whereas the ventral margin of the jugal of Allosaurus fragilis has pronounced sigmoidal convexity, the ventral margin is virtually straight in Allosaurus jimmadseni. The paired nasals of Allosaurus jimmadseni possess bilateral, blade-like crests along the lateral margin, forming a pronounced nasolacrimal crest that is absent in Allosaurus fragilis. Submitted 20 July 2018 Accepted 31 August 2019 Subjects Paleontology, Taxonomy Published 24 January 2020 Keywords Allosaurus, Allosaurus jimmadseni, Dinosaur, Theropod, Morrison Formation, Jurassic, Corresponding author Cranial anatomy Mark A. -
Redalyc.Note on the Paleobiogeography Of
Anais da Academia Brasileira de Ciências ISSN: 0001-3765 [email protected] Academia Brasileira de Ciências Brasil SALES, MARCOS A.F.; CASCON, PAULO; SCHULTZ, CESAR L. Note on the paleobiogeography of Compsognathidae (Dinosauria: Theropoda) and its paleoecological implications Anais da Academia Brasileira de Ciências, vol. 86, núm. 1, enero-marzo, 2014, pp. 127-134 Academia Brasileira de Ciências Rio de Janeiro, Brasil Available in: http://www.redalyc.org/articulo.oa?id=32730090007 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Anais da Academia Brasileira de Ciências (2014) 86(1): 127-134 (Annals of the Brazilian Academy of Sciences) Printed version ISSN 0001-3765 / Online version ISSN 1678-2690 http://dx.doi.org/10.1590/0001-37652013100412 www.scielo.br/aabc Note on the paleobiogeography of Compsognathidae (Dinosauria: Theropoda) and its paleoecological implications MARCOS A.F. SALES1, PAULO CASCON2 and CESAR L. Schultz3 1Programa de Pós-Graduação em Geociências, Departamento de Paleontologia e Estratigrafia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Agronomia, 91501-970 Porto Alegre, RS, Brasil 2Departamento de Biologia, Universidade Federal do Ceará, Av. Mister Hull, Pici, 60455-760 Fortaleza, CE, Brasil 3Departamento de Paleontologia e Estratigrafia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Agronomia, 91501-970 Porto Alegre, RS, Brasil Manuscript received on april 16, 2012; accepted for publication on June 4, 2013 ABSTRACT The paleobiogeography of the theropod clade Compsognathidae is here reaccessed in order to test the hypothesis of this taxon being adapted specifically to inhabit semi-arid environments. -
Compsognathus
21st Century Junior Library Compsognathus by Jennifer Zeiger CHERRY LAKE PUBLISHING * ANN ARBOR, MICHIGAN Published in the United States of America by Cherry Lake Publishing Ann Arbor, Michigan www.cherrylakepublishing.com Content Adviser: Gregory M. Erickson, PhD, Dinosaur Paleontologist, Department of Biological Science, Florida State University, Tallahassee, Florida Reading Adviser: Marla Conn, Read with Me Now Photo Credits: Cover, ©Stocktrek Images, Inc./Alamy; pages 4, 6, 8, 10, and 18, ©Linda Bucklin/ Shutterstock, Inc.; page 12, ©STT0008142/Media Bakery; page 14, ©STT0007399/ Media Bakery; page 16, ©STT0007398/Media Bakery; page 20, ©ASSOCIATED PRESS Copyright ©2013 by Cherry Lake Publishing All rights reserved. No part of this book may be reproduced or utilized in any form or by any means without written permission from the publisher. LIBRARY OF CONGRESS CATALOGING-IN-PUBLICATION DATA Zeiger, Jennifer. Compsognathus/by Jennifer Zeiger. p. cm.—(21st century junior library) (Dinosaurs) Includes bibliographical references and index. ISBN 978-1-61080-462-2 (lib. bdg.)—ISBN 978-1-61080-549-0 (e-book)— ISBN 978-1-61080-636-7 (pbk.) 1. Compsognathus—Juvenile literature. I. Title. QE862.S3Z45 2013 567.912—dc23 2012001732 Cherry Lake Publishing would like to acknowledge the work of The Partnership for 21st Century Skills. Please visit www.21stcenturyskills.org for more information. Printed in the United States of America Corporate Graphics Inc. July 2012 CLFA11 CONTENTS 5 Tiny Dino 9 Built to Run 15 Chasing Down Dinner 21 Animal of the Past 22 Glossary 23 Find Out More 24 Index 24 About the Author Compsognathus was small but fast. 4 Tiny Dino I t is a warm, sunny afternoon.