Images for Chapter 15 The Origin of Mammals

Cynodonts

• Cynodonts near the ancestry of mammals. Figure 15.2.
• Late Permian cynodont from Russia, Dvinia
• Dvinia reconstructed as rather "mammal-like"
• Skeleton of Procynosuchus.
• Skeleton as reconstructed by Kemp in 1982 Palaeos site.
• Reconstructed skeleton of Procynosuchus.
• Views of the skull of Procynosuchus
• Cute restoration of Diarthrognathus or a close relative of it.
• Reconstruction of Thrinaxodon. Paul Olsen's Earthscape site.
• Thrinaxodon skull. Paul Olsen's Earthscape site.
• Thrinaxodon outline. South African Museum.
• Thrinaxodon skull. South African Museum.
• 3D CT scan of the cynodont Thrinaxodon.
• Tritylodon. South African Museum.

Teeth and jaws

• Tooth occlusion in the Permian synapsid Suminia. A news release from the University of Toronto, June 12, 2001.
• Jaw joint in advanced cynodonts. Figure 15.1.
• Masseter muscle. Figure 15.3.

Mammalian Reproduction

The First Mammals

Morganucodonts

• Reconstruction of Morganucodon.
• Drawing of a morganucodont. Figure 15.6.

Hadrocodium, a new Early Jurassic mammal.

• Hadrocodium skull and paperclip. Carnegie Museum.
• Hadrocodium reconstruction and paperclip. Carnegie Museum.
• Cladogram showing position of Hadrocodium. Carnegie Museum.

Triconodonts

• Repenomamus, from China:
  • Nature news service
  • Nature news service
  • BBC News OnLine site
  • National Geographic news site
• Jeholodens, from China:
  • Drawing of fossil of Jeholodens
  • Reconstructed skeleton of Jeholodens
  • Cladogram showing position of Jeholodens
  • Life reconstruction of Jeholodens. Carnegie Museum site.
• Triconodont teeth

Phylogram for advanced mammals. Figure 15.8.

Monotremes

• Echidna
• Platypus

Multituberculates

• Multituberculate skulls Better than Figure 15.9a.
• Ptilodus skeleton in life posture. Better than 15.10, but flip it to correct posture on trunk!
• 3-D CT scan of the skull of Kryptobataar. University of Texas CT lab. Better than Figure 15.9b.

The Tribosphenic Molar

• The morphology of cheek teeth 1
• The morphology of cheek teeth 1
• Teeth of a red panda
• Lophodont teeth
• Loxodont teeth
• Cheek teeth of a baboon
• Cheek teeth of a gazelle
• Cheek teeth of a chimpanzee
• Cheek teeth of a wolf
• Cheek teeth of a marsupial

Zhangheotherium

• Reconstruction of Zhangheotherium: Carnegie Magazine OnLine, 1998.

Tribosphenic Teeth Evolved Twice

• Cladogram of the issue

Zalambdalestes skeleton

Marsupials and their ancestors (metatherians)

• The oldest metatherian (stem marsupial) yet: from the famous Liaoning beds of north China, early Cretaceous: Sinodelphys.
  • The fossil of Sinodelphys from the Carnegie Museum.
  • Drawing reconstruction of Sinodelphys
  • Painting of Sinodelphys from the Carnegie Museum.
  • Painting of Sinodelphys at night from the Carnegie Museum.
  • Cladogram showing position of Sinodelphys.

• Three news stories (December 1998) about the discovery of a very early (80 Ma) well-preserved marsupial ancestor from Mongolia, Deltatheridium:
  • Jaws and teeth.
  • Reconstruction from the BBC news site
  • CNN news

  Placentals and their ancestors (eutherians)

  • Eomaia, the earliest eutherian mammal: another stunning fossil from China
    • Drawings of Eomaia
    • The fossil of Eomaia
    • Reconstruction of Eomaia

  Page last updated January 13, 2005.

  Links last checked, August 27, 2004.

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