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Molecular Biology and Evolution, Vol 12, 641-649, Copyright © 1995 by Society for Molecular Biology and Evolution


ORIGINAL ARTICLE

Phylogeny of protostome worms derived from 18S rRNA sequences

B Winnepenninckx, T Backeljau and R De Wachter
Department Biochemie, Universiteit Antwerpen (UIA), Belgium.

The phylogenetic relationships of protostome worms were studied by comparing new complete 18S rRNA sequences of Vestimentifera, Pogonophora, Sipuncula, Echiura, Nemertea, and Annelida with existing 18S rRNA sequences of Mollusca, Arthropoda, Chordata, and Platyhelminthes. Phylogenetic trees were inferred via neighbor-joining and maximum parsimony analyses. These suggest that (1) Sipuncula and Echiura are not sister groups; (2) Nemertea are protostomes; (3) Vestimentifera and Pogonophora are protostomes that have a common ancestor with Echiura; and (4) Vestimentifera and Pogonophora are a monophyletic clade.
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