Evolutionary size increase and longevity in Jurassic bivalves and ammonites

  title={Evolutionary size increase and longevity in Jurassic bivalves and ammonites},
  author={A. J. Hallam},
A study of the relationship between the rate of increase of size and generic or specific longevity in Jurassic ammonites and bivalves shows that taxa which increase more rapidly become extinct more quickly. The results, which can be interpreted stochastically, make it possible to distinguish two modes of evolution respectively involving an increase and decrease in size. 

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