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The mid-developmental transition and the evolution of animal body plans [Nature]

par Frédéric Magné - publié le

Animals are grouped into 35 ‘phyla’ based upon the notion of distinct body plans. Morphological and molecular analyses have revealed that a stage in the middle of development—known as the phylotypic period—is conserved among species within some phyla. Although these analyses provide evidence for their existence, phyla have also been criticized as lacking an objective definition, and consequently based on arbitrary groupings of animals.(...)

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