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A phylogeny of members of the family Taeniidae based on the mitochondrial cox1 and nad1 gene data

Published online by Cambridge University Press:  21 October 2008

A. LAVIKAINEN*
Affiliation:
Department of Bacteriology and Immunology, Haartman Institute, P.O. Box 21, FI-00014University of Helsinki, Finland
V. HAUKISALMI
Affiliation:
Vantaa Research Unit, Finnish Forest Research Institute, P.O. Box 18, FI-01301 Vantaa, Finland
M. J. LEHTINEN
Affiliation:
Department of Bacteriology and Immunology, Haartman Institute, P.O. Box 21, FI-00014University of Helsinki, Finland
H. HENTTONEN
Affiliation:
Vantaa Research Unit, Finnish Forest Research Institute, P.O. Box 18, FI-01301 Vantaa, Finland
A. OKSANEN
Affiliation:
Fish and Wildlife Health Research Unit, Finnish Food Safety Authority Evira, P.O. Box 517, FI-90101 Oulu, Finland
S. MERI
Affiliation:
Department of Bacteriology and Immunology, Haartman Institute, P.O. Box 21, FI-00014University of Helsinki, Finland Helsinki University Central Hospital, P.O. Box 400, FI-00029 HUS, Finland
*
*Corresponding author: Department of Bacteriology and Immunology, Haartman Institute, P.O. Box 21, FI-00014University of Helsinki, Finland. Tel: +358919126891. Fax: +358919126382. E-mail: antti.lavikainen@helsinki.fi

Summary

The cestode family Taeniidae consists of 2 genera, Taenia and Echinococcus, which both have been the focus of intensive taxonomic and epidemiological studies because of their zoonotic importance. However, a comprehensive molecular phylogeny of this family has yet to be reconstructed. In this study, 54 isolates representing 9 Taenia species were characterized using DNA sequences in the mitochondrial cytochrome c oxidase subunit 1 (cox1) and NADH dehydrogenase subunit 1 (nad1) genes. Phylogenetic relationships within the family Taeniidae were inferred by combining cox1 and nad1 sequence data of the present and previous studies. In the phylogenetic analysis, the genus Echinococcus was shown to be monophyletic, but Taenia proved to be paraphyletic due to the position of T. mustelae as a probable sister taxon of Echinococcus. This indicates that T. mustelae should form a genus of its own. Taenia ovis krabbei was placed distant from T. ovis ovis, as a sister taxon of T. multiceps, supporting its recognition as a distinct species, T. krabbei. High intraspecific sequence variation within both T. polyacantha and T. taeniaeformis suggests the existence of cryptic sister species.

Type
Original Articles
Copyright
Copyright © 2008 Cambridge University Press

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