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Schistosoma kisumuensis n. sp. (Digenea: Schistosomatidae) from murid rodents in the Lake Victoria Basin, Kenya and its phylogenetic position within the S. haematobium species group

Published online by Cambridge University Press:  02 July 2009

B. HANELT*
Affiliation:
Department of Biology, University of New Mexico, MSC03 2020, Albuquerque, New Mexico, 87131-0001, USA
S. V. BRANT
Affiliation:
Department of Biology, University of New Mexico, MSC03 2020, Albuquerque, New Mexico, 87131-0001, USA
M. L. STEINAUER
Affiliation:
Department of Biology, University of New Mexico, MSC03 2020, Albuquerque, New Mexico, 87131-0001, USA
G. M. MAINA
Affiliation:
Centre for Biotechnology Research and Development, Kenya Medical Research Institute, Mbagathi Road, PO Box 54840-00200, City Square, Nairobi, Kenya
J. M. KINUTHIA
Affiliation:
Centre for Biotechnology Research and Development, Kenya Medical Research Institute, Mbagathi Road, PO Box 54840-00200, City Square, Nairobi, Kenya
L. E. AGOLA
Affiliation:
Centre for Biotechnology Research and Development, Kenya Medical Research Institute, Mbagathi Road, PO Box 54840-00200, City Square, Nairobi, Kenya
I. N. MWANGI
Affiliation:
Centre for Biotechnology Research and Development, Kenya Medical Research Institute, Mbagathi Road, PO Box 54840-00200, City Square, Nairobi, Kenya
B. N. MUNGAI
Affiliation:
Centre for Biotechnology Research and Development, Kenya Medical Research Institute, Mbagathi Road, PO Box 54840-00200, City Square, Nairobi, Kenya
M. W. MUTUKU
Affiliation:
Centre for Biotechnology Research and Development, Kenya Medical Research Institute, Mbagathi Road, PO Box 54840-00200, City Square, Nairobi, Kenya
G. M. MKOJI
Affiliation:
Centre for Biotechnology Research and Development, Kenya Medical Research Institute, Mbagathi Road, PO Box 54840-00200, City Square, Nairobi, Kenya
E. S. LOKER
Affiliation:
Department of Biology, University of New Mexico, MSC03 2020, Albuquerque, New Mexico, 87131-0001, USA
*
*Corresponding author: Department of Biology, University of New Mexico, MSC03 2020, Albuquerque, New Mexico, 87131-0001, USA. Tel: +505 2774589. Fax: +505 2770304. E-mail: bhanelt@unm.edu

Summary

Schistosoma kisumuensis n. sp. is described based on 6 adult males and 2 adult females collected from the circulatory system of 3 murid rodent species, Pelomys isseli, Mastomys natalensis, and Dasymys incomtus. Specimens were collected from a single location, Nyabera Swamp, in Kisumu, Kenya in the Lake Victoria Basin. This new species is morphologically similar to members of the S. haematobium group, currently represented by 8 species parasitizing artiodactyls and primates, including humans. Schistosoma kisumuensis differs from these species by producing relatively small Schistosoma intercalatum-like eggs (135·2×52·9 μm) with a relatively small length to width ratio (2·55). Comparison of approximately 3000-base-pair sequences of nuclear rDNA (partial 28S) and mtDNA (partial cox1, nad6, 12S) strongly supports the status of S. kisumuensis as a new species and as a sister species of S. intercalatum. The cox1 genetic distance between these two species (6·3%) is comparable to other pairwise comparisons within the S. haematobium group. Separation of the Congo River and Lake Victoria drainage basins is discussed as a possible factor favoring the origin of this species.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2009

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