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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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(p.275) 48 NEMATOIDEA
Animal Evolution

Claus Nielsen

Oxford University Press

The Nematoidea is a group of worms with a seemingly unquestioned monophyly. Based on several apomorphies, including the cuticle with layers of crossing collagenous fibrils, the body wall with only longitudinal muscles, and the ectodermal longitudinal cords, the nematodes and the nematomorphs together constitute a monophyletic group. There are also differences between the two groups, such as the rod-shaped spermatozoa and the cuticle apparently without an epicuticle. Nematodes have specialised their feeding mechanism by the evolution of a myoepithelial sucking pharynx. Molecular evidence indicates that nematomorphs and nematodes are sister groups.

Keywords:   nematodes, Nematoidea, worms, nematomorphs, spermatozoa, feeding mechanism, evolution, pharynx

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