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Developmental Patterns in Spiralian Embryos
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Abstract
At least five animal phyla exhibit spiralian development, which is characterized by
striking similarities in the geometry of the early cleavage pattern and the fate map
of the blastula, along with similarities in larval morphology. Recent advances in
reconstructing the phylogeny of spiralians and their relatives suggest that the common
ancestor of a large clade of protostome phyla known as the Lophotrochozoa had spiralian
development. In this minireview, I describe characteristics of spiralian development
and some recent insights into its mechanisms and evolution.
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