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Are Platyhelminthes coelomates without a coelom? An argument based on the evolution of Hox genes

Are Platyhelminthes coelomates without a coelom? An argument based on the evolution of Hox genes

American Zoologist 38(6): 843-858

ISSN/ISBN: 0003-1569

DOI: 10.1093/icb/38.6.843

Two fundamentally opposed theories have been proposed to account for the origin of the body plan of flatworms and relate to different concepts of the evolution of the early metazoans. The classical planuloid/acoeloid theory is based on the similarity of flatworms to a hypothetical acoelomate worm-like ancestor of all bilaterians, suggesting that flatworms emerge very early in the bilaterian tree before the appearance of coelomate organisms.

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Accession: 003046088

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