18S rRNA data indicate that Aschelminthes are polyphyletic in origin and consist of at least three distinct clades.
The Aschelminthes is a collection of at least eight animal phyla, historically grouped together because the absence of a true body cavity was perceived as a pseudocoelom. Analyses of 18S rRNA sequences from six Aschelminth phyla (including four previously unpublished sequences) support polyphyly for the Aschelminthes. At least three distinct groups of Aschelminthes were detected: the Priapulida among the protostomes, the Rotifera-Acanthocephala as a sister group to the protostomes, and the Nematoda as a basal group to the triploblastic Eumetazoa.
Winnepenninckx
B
B
Departement Biochemie, Universiteit Antwerpen (UIA).
Backeljau
T
T
Mackey
L Y
LY
Brooks
J M
JM
De Wachter
R
R
Kumar
S
S
Garey
J R
JR
D000049:Acanthocephala / Q000235:genetics; D000828:Animal Population Groups / Q000235:genetics; D000818:Animals; D005075:Biological Evolution; D004064:Digestive System / Q000033:anatomy & histology; D019143:Evolution, Molecular; D017238:Genes, Helminth; D006376:Helminths / Q000033:anatomy & histology / Q000145:classification / Q000235:genetics*; D008969:Molecular Sequence Data; D009348:Nematoda / Q000235:genetics; D010802:Phylogeny; D018510:RNA, Helminth / Q000235:genetics*; D012337:RNA, Ribosomal, 18S / Q000235:genetics*; D012403:Rotifera / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000235:genetics; D016415:Sequence Alignment; D012689:Sequence Homology, Nucleic Acid; D013045:Species Specificity
D018510:RNA, Helminth; D012337:RNA, Ribosomal, 18S