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Molecular Biology and Evolution, Vol 12, 1132-1137, Copyright © 1995 by Society for Molecular Biology and Evolution


ORIGINAL ARTICLE

18S rRNA data indicate that Aschelminthes are polyphyletic in origin and consist of at least three distinct clades

B Winnepenninckx, T Backeljau, LY Mackey, JM Brooks, R De Wachter, S Kumar and JR Garey
Departement Biochemie, Universiteit Antwerpen (UIA).

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 Analyses of 18S rRNA sequences from six Aschelminth phyla (including four previously unpublished sequences) support polyphyly for the Aschelminthes.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.
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