Phylogenetic analysis based on 18s ribosomal RNA gene sequences supports the existence of class polyacanthocephala (acanthocephala)
Por:
García-Varela M., Cummings M.P., De León G.P.-P., Gardner S.L., Laclette J.P.
Publicada:
1 ene 2002
Resumen:
Members of phylum Acanthocephala are parasites of vertebrates and arthropods and are distributed worldwide. The phylum has traditionally been divided into three classes, Archiacanthocephala, Palaeacanthocephala, and Eoacanthocephala; a fourth class, Polyacanthocephala, has been recently proposed. However, erection of this new class, based on morphological characters, has been controversial. We sequenced the near complete 18S rRNA gene of Polyacanthorhynchus caballeroi (Polyacanthocephala) and Rhadinorhynchus sp. (Palaeacanthocephala); these sequences were aligned with another 21 sequences of acanthocephalans representing the three widely recognized classes of the phylum and with 16 sequences from outgroup taxa. Phylogenetic relationships inferred by maximum-likelihood and maximum-parsimony analyses showed Archiacanthocephala as the most basal group within the phylum, whereas classes Polyacanthocephala + Eoacanthocephala formed a monophyletic clade, with Palaeacanthocephala as its sister group. These results are consistent with the view of Polyacanthocephala representing an independent class within Acanthocephala. © 2002 Elsevier Science (USA). All rights reserved.
Filiaciones:
García-Varela M.:
Department of Immunology, Instituto De Investigaciones Biomédicas, México, D.F., Mexico
Cummings M.P.:
Department of Zoology, Instituto De Biolgía, UNAM, 04510 México, D.F., Mexico
De León G.P.-P.:
Josephine Bay Paul Center for Comparative Molecular Biology and Evolution, Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA 02543-1015, United States
Gardner S.L.:
Harold W. Manter Laboratory of Parasitology, W-529 Nebraska Hall, University of Nebraska-Lincoln, Lincoln, NE 68588-0514, United States
Laclette J.P.:
Department of Immunology, Instituto De Investigaciones Biomédicas, México, D.F., Mexico
|