Larvae and Evolution, toward a new zoology - Donald I. Williamson
KORTE INHOUD
In Larvae and Evolution Williamson developed a controversial hypothesis proposing the acquisition of larval stages in some marine organisms by hybridisation between two distant animal species (a speciation process referred to as hybridogenesis by Williamson).
Why do radially symmetric seastars have bilaterally symmetrical larvae? Why do marine worms and molluscs, so different as adults, have such similar larvae? These are only a few of the many incongruities in larval development, or apparent conflicts between larval and adult form, to be explored in this book.
The author proposes a radical hypothesis: that there has been horizontal transfer of larval form from one animal to another, sometimes in phyla that are quite distant, after the adult lineages have been established. The result is a new life history. In developing his hypothesis, the author proposes a non-Darwinian evolution taking place alongside conventional evolution of descent by gradual heritable changes. Thus are explained, in the author's view, a n...
Why do radially symmetric seastars have bilaterally symmetrical larvae? Why do marine worms and molluscs, so different as adults, have such similar larvae? These are only a few of the many incongruities in larval development, or apparent conflicts between larval and adult form, to be explored in this book.
The author proposes a radical hypothesis: that there has been horizontal transfer of larval form from one animal to another, sometimes in phyla that are quite distant, after the adult lineages have been established. The result is a new life history. In developing his hypothesis, the author proposes a non-Darwinian evolution taking place alongside conventional evolution of descent by gradual heritable changes. Thus are explained, in the author's view, a n...
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