18S rRNA data indicate that Aschelminthes are polyphyletic in origin and consist of at least three distinct clades.
Open Access
- 1 November 1995
- journal article
- research article
- Published by Oxford University Press (OUP) in Molecular Biology and Evolution
- Vol. 12 (6) , 1132-1137
- https://doi.org/10.1093/oxfordjournals.molbev.a040287
Abstract
The Aschelminthes is a collection of at least eight animal phyla, historically grouped together because the absence of a true body cavity was perceived as a pseudocoelom. Analyses of 18S rRNA sequences from six Aschelminth phyla (including four previously unpublished sequences) support polyphyly for the Aschelminthes. At least three distinct groups of Aschelminthes were detected: the Priapulida among the protostomes, the Rotifera-Acanthocephala as a sister group to the protostomes, and the Nematoda as a basal group to the triploblastic Eumetazoa.Keywords
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