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Animal EvolutionInterrelationships of the Living Phyla$
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Claus Nielsen

Print publication date: 2011

Print ISBN-13: 9780199606023

Published to Oxford Scholarship Online: December 2013

DOI: 10.1093/acprof:oso/9780199606023.001.0001

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Animal Evolution

Claus Nielsen

Oxford University Press

The Schizocoelia is a clade comprised of four phyla: Annelida, Sipuncula, Mollusca, and Nemertini. The name is synonymous with Eutrochozoa, and the groups within the Spiralia possess the lateral coelomic sacs developing through schizocoely in the mesoderm formed from the two primary mesoblasts. This mode of coelom formation is unique among spiralians. The Brachiozoa is often included as the sister group of the nemertines.

Keywords:   spiralians, Schizocoelia, Annelida, Sipuncula, Mollusca, Nemertini, Eutrochozoa, Spiralia, Brachiozoa, nemertines

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