A developmental perspective: changes in the position of the blastopore during bilaterian evolution

MQ Martindale, A Hejnol - Developmental cell, 2009 - cell.com
Developmental cell, 2009cell.com
Progress in resolving the phylogenetic relationships among animals and the expansion of
molecular developmental studies to a broader variety of organisms has provided important
insights into the evolution of developmental programs. These new studies make it possible
to reevaluate old hypotheses about the evolution of animal body plans and to elaborate new
ones. Here, we review recent studies that shed light on the transition from a radially
organized ancestor to the last common ancestor of the Bilateria (" Urbilaterian") and present …
Progress in resolving the phylogenetic relationships among animals and the expansion of molecular developmental studies to a broader variety of organisms has provided important insights into the evolution of developmental programs. These new studies make it possible to reevaluate old hypotheses about the evolution of animal body plans and to elaborate new ones. Here, we review recent studies that shed light on the transition from a radially organized ancestor to the last common ancestor of the Bilateria ("Urbilaterian") and present an integrative hypothesis about plausible developmental scenarios for the evolution of complex multicellular animals.
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