Evolution of Jaw Mechanisms in Ornithopod Dinosaurs

Evolution of Jaw Mechanisms in Ornithopod Dinosaurs

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The Ornithopoda, one of five suborders within the Ornithischia, was originally proposed by Marsh in 1881 to include those bipedal dinosaurs possessing a predentary bone fitted over the rostral end of the mandibles. Ornithopods as recognized today can be further characterized by moderately long facial skele- tons equipped with well-developed, often toothless premaxillae and moderate to large external nares. Maxillary and dentary dentitions vary but usually consist of at least one replacement series beneath the functional set; some have many rows of successional teeth. Tooth morphology suggests ornithopods were suc- cessful herbivores but, as will be discussed, the precise way(s) in which ornitho- pods chewed their food, hence lending important information about their tro- phic position, has not been settled. Postcranially, ornithopods show specializa- tion for bipedality in hindlimb construction and lack well-developed protective structures on their flanks, back, and tail.
The Ornithopoda can itself be divided into five families: Fabrosauridae, He- terodontosauridae, Hypsilophodontidae, 19uanodontidae, and Hadrosauridae (subdivided into the subfamilies Hadrosaurinae and Lambeosaurinae). Both fabrosaurids and heterodontosaurids, first known from the Late Triassic and Early Jurassic of Argentina and South Africa, were small animals differing in details of cranial, dental, and appendicular anatomy. Fabrosaurids are be- lieved to represent the basal ornithopod stock (Galton 1972, 1978; Thulborn 1970a, 1972). During the Jurassic, ornithopods underwent major radiations that included the medium- to large-sized Hypsilophodontidae and the large- bodied Iguanodontidae, both of which survived into the Cretaceous.
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Product details

  • Paperback | 112 pages
  • 170 x 244 x 6.6mm | 260g
  • Springer-Verlag Berlin and Heidelberg GmbH & Co. K
  • Berlin, Germany
  • English
  • Softcover reprint of the original 1st ed. 1984
  • 4 Illustrations, black and white; VIII, 112 p. 4 illus.
  • 3540131140
  • 9783540131144

Table of contents

1 Introduction.- 2 Ornithopod Jaw Mechanics.- 3 Materials and Methods.- 4 Comparative Arthrology.- 4.1 Introduction.- 4.2 Mechanical Units.- 5 Neurocranial Segment.- 5.1 Laterosphenoid-Skull Roof Joint.- 5.2 Basisphenoid-Pterygoid Joint.- 6 Maxillary Segment.- 6.1 Parietal Unit.- 6.1.1 Frontal-Parietal Joint.- 6.1.2 Postorbital-Frontal Joint.- 6.1.3 Postorbital-Parietal Joint.- 6.1.4 Postorbital-Squamosal Joint.- 6.2 Quadrate Unit.- 6.2.1 Quadrate-Squamosal Joint.- 6.2.2 Quadrate-Pterygoid Joint.- 6.2.3 Quadrate-Quadratojugal Joint.- 6.2.4 Jugal-Quadrate Joint.- 6.2.5 Quadrate-Mandible Joint.- 6.3 Muzzle Unit.- 6.3.1 Frontal-Frontal Joint.- 6.3.2 Nasal-Frontal Joint.- 6.3.3 Premaxilla-Frontal Joint.- 6.3.4 Prefrontal-Frontal Joint.- 6.3.5 Prefrontal-Lacrimal Joint.- 6.3.6 Lacrimal-Nasal Joint.- 6.3.7 Prefrontal-Premaxilla Joint.- 6.3.8 Nasal-Nasal Joint.- 6.3.9 Nasal-Premaxilla Joint.- 6.3.10 Nasal-Maxilla Joint.- 6.3.11 Premaxilla-Premaxilla Joint.- 6.3.12 Maxilla-Premaxilla Joint.- 6.3.13 Premaxilla-Lacrimal Joint.- 6.3.14 Nasal-Prefrontal Joint.- 6.3.15 Postorbital-Prefrontal Joint.- 6.4 Maxillopalatal Unit.- 6.4.1 Palatine-Pterygoid Joint.- 6.4.2 Pterygoid-Ectopterygoid Joint.- 6.4.3 Maxilla-Ectopterygoid Joint.- 6.4.4 Maxilla-Palatine Joint.- 6.4.5 Maxilla-Pterygoid Joint.- 6.4.6 Jugal-Maxilla Joint.- 6.4.7 Maxilla-Lacrimal Joint.- 6.4.8 Jugal-Lacrimal Joint.- 6.4.9 Lacrimal-Palatine Joint.- 6.4.10 Jugal-Quadratojugal Joint.- 6.4.11 Jugal-Ectopterygoid Joint.- 6.4.12 Postorbital-Jugal Joint.- 6.4.13 Squamosal-Quadratojugal Joint.- 6.4.14 Jugal-Palatine Joint.- 6.4.15 Palatine-Ectopterygoid Joint.- 6.4.16 Vomer-Palatine Joint.- 6.4.17 Vomer-Pterygoid Joint.- 6.4.18 Vomer-Premaxilla Joint.- 7 Mandibular Segment.- 7.1 Dentary-Dentary Joint.- 7.2 Predentary-Dentary Joint.- 8 Dental Morphology.- 8.1 Fabrosauridae.- 8.2 Heterodontosauridae.- 8.3 Hypsilophodontidae.- 8.4 Iguanodontidae.- 8.5 Hadrosauridae.- 9 Kinematic Analyses of Ornithopod Jaw Mechanisms.- 9.1 Predictions.- 9.2 Documentation and Evolutionary Implications.- 10 Discussion and Conclusions.- 11 Summary.- 12 Acknowledgments.- Note added in proof.- 13 References.- 14 Subject Index.
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