Phylogenetic relationships within the Terebellomorpha

• DOI: 10.1017/s002531540100457x
• Publication Date: 2003-10-15T16:19:08Z
• Authors: D.J. Colgan; P.A. Hutchings; S. Brown
• Keywords: Paraphyly; Monophyly; Subfamily; Clitellata

Terebellomorpha is a clade of predominantly tube-dwelling polychaetes, some whose species are very abundant and habitats range from shallow to deep waters. The group contains five families (Terebellidae, Ampharetidae, Pectinariidae, Trichobranchidae Alvinellidae). This study their inter-relationships uses DNA sequence data gene segments. Including outgroups, sequences were available for 15 U2 snRNA, 14 Histone H3, 23 the D1 expansion region 28S rDNA, D9-10 rDNA 17 subunit I cytochrome oxidase. Outgroups included representatives polychaete Cirratulidae, Sabellidae Siboglinidae, clitellate Lumbricus . These include eight GenBank entries one CO1. Generally, in all analyses restricted collected this laboratory, but including these, monophyletic. Within Terebellomorpha, single maximum parsimony tree indicates that Alvinellidae (all GenBank) belongs with Terebellidae Trichobranchidae, contradicting morphological expectations. paraphyletic respect Trichobranchus , being associated subfamily Thelepodinae. second trichobranchid genus Terebellides (for which only topologically distinct Additional needed establish family's monophyly. Also within Terebellidae, Terebellinae Polycirrinae, supporting suggestion subfamily's simplicity derived.