Images for Chapter 12 Dinosaurs

Dinosaur Overview

Cladogram of Dinosauria: Image by Tom Holtz, University of Maryland

Theropods

Late Triassic basal theropods from Argentina:

Eoraptor

Herrerasaurus

Ceratosauria

Tetanurans
The other theropods, (collectively called tetanurans, separated early into the allosaurs (massive, powerful predators) and the lighter and more agile coelurosaurs.

Allosaurs

Coelurosaurs

Mononykus.a bird-like theropod from Mongolia, placed within a group called the alvarezsaurids. I write in the book that I suspect it operated rather like a megapod, for example, the brush turkey of Queensland, Australia.

Ornithomimids are the so-called ostrich dinosaurs.

Ornitholestes drawing Paul Olsen's Earthscape site.

Tyrannosaurs

Large theropods from the Cretaceous of Gondwana

Carcharodontosaurus from North Africa.

Strange theropods
Incisivosaurus, a gnawing oviraptosaur.

Spinosaurs

No-one properly understands Therizinosaurs yet. They are theropods, but evolved toward a vegetarian life style.

Abelisaurs, theropod dinosaurs that flourished in Gondwanaland, in parallel with the dominantly Laurasian coelurosaurs.

  • The latest new abelisaurid is Masiakasaurus, from Madagascar. (Press release from NSF).
  • Masiakasaurus head with projecting teeth. National Geographic News, 2001

    Ornithischians

    Cladogram of ornithischians. Figure 12.12.
    Early and basal ornithischians

    Ornithopods

    Marginocephalia
    Cladogram of marginocephalians Image by Tom Holtz, University of Maryland

    Thyreophora: Stegosaurs and Ankylosaurs

    Ceratopsians

    Sauropodomorphs

    Cladogram of sauropodomorphs. Image by Tom Holtz, University of Maryland

    Prosauropods

    Sauropods

    Even a cautious person must admit that well-documented sauropod body lengths are over 100 feet and weights are at least 50 tons. For example, Seismosaurus

    Dinosaur Paleobiology: Life at Large Size

    Posture and Habitat

    Dinosaur Growth

    Dinosaur Behavior

    Parasaurolophus

    Dinosaur Noses

    Dinosaur nostrils may have been reconstructed in the wrong place. New Scientist

    Eggs and Nests

    BROWSE THIS: Dino Russ's dinosaur egg site, with many links

    Dinosaur Coprolite

    Were Dinosaurs Warm-Blooded?

    Feathers on theropod dinosaurs