Phylogeny of protostome worms derived from 18S rRNA sequences |
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Authors: | Winnepenninckx B; Backeljau T; De Wachter R |
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Institution: | Department Biochemie, Universiteit Antwerpen (UIA), Belgium. |
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Abstract: | 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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Keywords: | |
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