THE EVOLUTION OF SHARKS
SPECIMENS COURTESY DR. STEPHEN L. CUMBAA and the
CANADIAN MUSEUM OF NATURE
Photos taken by Brett Harris
For comments and criticisms contact Brett Harris at
bharris@chat.carleton.ca


CHAPTER 1: INTRODUCTION TO SHARKS (EXTANT)
            PAGE 1: DEFINITION
            PAGE 2: SHARKS
            PAGE 3: SKATES AND RAYS
            PAGE 4: CHIMAERAS
            PAGE 5: EXTANT ORDERS 
Great white shark teeth 
Specimen courtesy Canadian Museum of Nature 
Cat #  NMC 89 - 0126 

CHAPTER 2: SHARKS AND THE FOSSIL RECORD (EXTINCT)
              PAGE 6: SHARK TIMELINE
              PAGE 6a: CLADOGRAM
              PAGE 7: CLADOSELACHE
              PAGE 8: XENACANTH
              PAGE 9: HYBODONTS
              PAGE 10: NEOSELACHII
              PAGE 11: MEGALODON 
              PAGE 11a: MEGALODON 2
Cyclobatis
Fossilized ray from Lebanon 
Mid-Cretaceous 
Specimen courtesy Canadian Museum of Nature 
Cat # 29469 

CHAPTER 3: SHARK EVOLUTION (TEETH)
              PAGE 12: TEETH
              PAGE 13: CUTTING TEETH
              PAGE 14: CRUSHING TEETH
              PAGE 15: IMPALING TEETH
              PAGE 16: SPIRAL TEETH 

Teeth replacement (cross-section) 
Drawing by Chris Moles from Stafford-Deitsch 

CHAPTER 4: SHARK EVOLUTION (SENSORY)
                PAGE 17: ELECTRORECEPTION
CHAPTER 5: SHARK EVOLUTION (BIOLOGY)
                PAGE 18: REPRODUCTION
GLOSSARY

LINKS
 

REFERENCES

copyright Brett Harris, 1999
bharris@chat.carleton.ca


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