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Nuclear rDNA ITS sequence variation in the trematode genus Echinostoma: an aid to establishing relationships within the 37-collar-spine group

Published online by Cambridge University Press:  06 April 2009

J. A. T. Morgan  and
D. Blair
J. A. T. Morgan
Affiliation:
Zoology Department, James Cook University, Townsville, Queensland, Australia4811
D. Blair
Affiliation:
Zoology Department, James Cook University, Townsville, Queensland, Australia4811
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Summary

The taxonomic history of members of the 37-collar-spine group within the genus Echinostoma has been very confused. We obtained DNA sequence data from the nuclear rDNA ITS1, 5·8S and ITS2 of 7 nominal species belonging to this group, Echinostoma trivolvis (Cort, 1914), E. revolution (Frölich, 1802), E. caproni Richard, 1964, E. liei Jeyarasasingam et al. 1972, E. paraensei Lie & Basch, 1967, two African isolates, E. sp.I and E. sp.II, and of one 28-collar-spined echinostome, E. hortense (Asada, 1926). Five of the eight species were clearly distinguishable using ITS data. Sequences from the remaining three taxa, E. caproni, E. sp.II and E. liei were identical to one another and the group containing these taxa was distant from other 37-collar-spine species on a phylogenetic tree. E. trivolvis and E. paraensei form a second, but less distinct group within the 37-collar-spine group. The resolution obtained using DNA sequencing will assist in the current reclassification of the group. It also provides a model for future work on sibling species.

Keywords

internal transcribed spacerEchinostomanucleotide sequencephylogenyTrematodaribosomal DNA
Type
Research Article
Information
Parasitology , Volume 111 , Issue 5 , December 1995 , pp. 609 - 615
Copyright
Copyright © Cambridge University Press 1995

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