Books  Evolutionary Biology  Evolutionary Biology 

Larvae and Evolution

Out of Print

By: DI Williamson

233 pages, 35 illus

Chapman & Hall

Hardback | Dec 1992 | #17039 | ISBN: 0412030810
Out of Print Details

About this book

Offers a comprehensive explanation of the major anomalies between adults and their larvae in many groups of animals, presenting evidence for a non-Darwinian type of evolution taking place alongside Darwinian evolution. The author's thesis is that at various points in evolutionary time - quite rarely, but often enough to effect major changes in the direction of evolution - organisms captured genes from distantly related organisms. These genes were then incorporated into the genomes of the host organisms, where they are expressed in larval or juvenile stages, but not in adults. These are explained by presenting a number of widely known and otherwise unfathomable incongruities between larval stages and corresponding adults.


Contents

Evolution, relationships and larvae. Crustaceans with incongruous larvae. Echinoderms and their larvae. The affinities of echinoderms. The metamorphosis of echinoderms. The relationship between sea-urchins and brittle-stars. Echinoderms through the ages. The trochophorate phyla. The near-trochophorate phyla. Gene transfer. Testing the theories. Implications.

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