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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 Cycloneuralia is a monophyletic group comprised of five phyla: Nematoda, Nematomorpha, Priapula, Kinorhyncha, and Loricifera. Apomorphies include an anterior mouth, a cylindrical pharynx, and a collar-shaped, peripharyngeal brain. Some studies show the tardigrades as an ingroup of the ecdysozoans, while most suggest that scalidophorans and nematoids are separate clades in various positions relative to the arhropods, although the priapulans are basal in a number of trees. The Nematoidea is possibly an ingroup of the Scalidophora.

Keywords:   nematoids, Cycloneuralia, Nematoda, Nematomorpha, Priapula, Kinorhyncha, Loricifera, scalidophorans, Nematoidea, Scalidophora

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