Advertisement

The Evolution of Mammalian Characters

  • Doris M. Kermack
  • Kenneth A. Kermack

Table of contents

  1. Front Matter
    Pages i-x
  2. Doris M. Kermack, Kenneth A. Kermack
    Pages 1-17
  3. Doris M. Kermack, Kenneth A. Kermack
    Pages 18-36
  4. Doris M. Kermack, Kenneth A. Kermack
    Pages 37-47
  5. Doris M. Kermack, Kenneth A. Kermack
    Pages 48-65
  6. Doris M. Kermack, Kenneth A. Kermack
    Pages 66-88
  7. Doris M. Kermack, Kenneth A. Kermack
    Pages 89-99
  8. Doris M. Kermack, Kenneth A. Kermack
    Pages 100-105
  9. Doris M. Kermack, Kenneth A. Kermack
    Pages 106-130
  10. Doris M. Kermack, Kenneth A. Kermack
    Pages 131-139
  11. Doris M. Kermack, Kenneth A. Kermack
    Pages 140-142
  12. Back Matter
    Pages 143-149

About this book

Introduction

This book is not intended to give a full and comprehensive account of the Mesozoic mammals, and nor is it intended as a handbook for research workers studying pre-Tertiary mammals. Our intention is to give an account of the origin and evolution of certain of the characters of the Mammalia. We have tried to portray the fossils we describe as the living animals they once were, not as dead bones. Our account ends with the end of the Lower Cretaceous, since by that time the major characters of the mammals had become established. There exist a number of characters which, at the present day, are confined to the Mammalia. These include: (1) a jaw articulation formed by the squamosal and the dentary; (2) a chain of three bones, malleus, incus and stapes connecting the tympanic membrane to the inner ear; (3) the presence of hair or fur; (4) the presence of milk-glands in the female; (5) the left aortic arch is the systemic arch; (6) the phalangeal formula in both manus and pes is 2.3.3.3.3; (7) some of the teeth have more than one root. Of these characters (1) or (2) are sufficient by themselves to define a mammal; characters (6) and (7) are known to have been already in existence in some of the mammal-like reptiles - the ancestors of the mammals.

Keywords

Cretaceous evolution mammals research the origin

Authors and affiliations

  • Doris M. Kermack
    • 1
  • Kenneth A. Kermack
    • 2
  1. 1.Department of Pure & Applied BiologyImperial CollegeLondonUK
  2. 2.Department of ZoologyUniversity College, LondonLondonUK

Bibliographic information