title: Phylogeny of protostome worms derived from 18S rRNA sequences.
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.
authors.affiliation: Department Biochemie, Universiteit Antwerpen (UIA), Belgium.
authors.forename: B
authors.initials: B
authors.lastname: Winnepenninckx
authors.forename: T
authors.initials: T
authors.lastname: Backeljau
authors.forename: R
authors.initials: R
authors.lastname: De Wachter
mesh_terms: D000818:Animals; D000845:Annelida / Q000235:genetics; D001483:Base Sequence; D002816:Chordata, Nonvertebrate / Q000235:genetics; D007448:Invertebrates / Q000235:genetics*; D008969:Molecular Sequence Data; D008974:Mollusca / Q000235:genetics; D010802:Phylogeny; D012337:RNA, Ribosomal, 18S / Q000235:genetics*; D016415:Sequence Alignment; D012689:Sequence Homology, Nucleic Acid
chemical_list: D012337:RNA, Ribosomal, 18S