Molecular phylogenetics of subclass Peritrichia (Ciliophora: Oligohymenophorea) based on expanded analyses of 18S rRNA sequences.
Phylogenetic relationships among peritrich ciliates remain unclear in spite of recent progress. To expand the analyses performed in previous studies, and to statistically test hypotheses of monophyly, we analyzed a broad sample of 18s rRNA sequences (including 15 peritrich genera), applying a conservative alignment strategy and several phylogenetic approaches. The main results are that: (i) the monophyly of Peritrichia cannot be rejected; (ii) the two main clades of Sessilida do not correspond to formally recognized taxa; (iii) the monophyly of genera Vorticella and Epistylis is significantly rejected; and (iv) morphological structures commonly used in peritrich taxonomy may be evolutionarily labile.
Utz
Laura R P
LR
Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, RS, Brazil. laurautz@yahoo.com
Eizirik
Eduardo
E
D000818:Animals; D016802:Oligohymenophorea / Q000145:classification / Q000235:genetics*; D010802:Phylogeny; D016053:RNA, Protozoan / Q000235:genetics; D012337:RNA, Ribosomal, 18S / Q000235:genetics
D016053:RNA, Protozoan; D012337:RNA, Ribosomal, 18S