Phylogenetic relationships of snails of the genera Oncomelania and Tricula inferred from the mitochondrial 12S rRNA gene

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  • OKAMOTO MUNEHIRO
    Department of Laboratory Animal Science, School of Veterinary Medicine, Faculty of Agriculture, Tottori University
  • LO CHIN-TSON
    Department of Parasitology, National Yang-Ming University
  • TIU WILFRED U.
    Department of Parasitology, College of Public Health, University of Philippines
  • QUI DONGCHUAN
    Department of Schistosomiasis, Sichuan Institute of Parasitic Diseases
  • HADIDJAJA PINARDI
    Department of Parasitology, Faculty of Medicine, University of Indonesia
  • UPATHAM SUCHART
    Department of Biology, Faculty of Science, Mahidol University
  • SUGIYAMA HIROMU
    Department of Parasitology, National Institute of Infectious diseases
  • TAGUCHI TAKAHIRO
    Department of Anatomy, Faculty of Medicine, Kochi Medical School
  • HIRAI HIROHISA
    Department of Population Genetics, Primate Research Institute, Kyoto University
  • SAITO YASUHIDE
    Department of Parasitology, Faculty of Veterinary Medicine, Azabu University
  • HABE SHIGEHISA
    Department of Parasitology, Faculty of Medicine, Fukuoka University
  • KAWANAKA MASANORI
    Department of Parasitology, National Institute of Infectious diseases
  • HIRATA MIZUKI
    Department of Parasitology, Faculty of Medicine, Kurume University
  • AGATSUMA TAKESHI
    Department of Environmental Health Science, Faculty of Medicine, Kochi Medical School

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Description

The Schistosoma japonicum group and S. sinensium utilize intermediate snail hosts belonging to the genera Oncomelania and Tricula (Gastropoda : Pomatiopsidae). In the present study, partial sequences of the mitochondrial 12S rRNA gene from 7 subspecies of O. hupensis, two species of Tricula (T bollingi and T humida) and O. minima were examined to infer a phylogeny for these. Nucleotide differences among subspecies of O. hupensis were less than 6.5% and among species from different genera, 10-12%. The phylogenetic tree obtained in this study indicates that O. hupensis subspecies fell into four distinct clades ; thatis, O. h. quadrasi from the Philippines, O. h. lindoensis from Indonesia, O. h. hupensis from Yunnan, China and the remaining 5 subspecies (O. h. hupensis from other parts of China, O. h. robertsoni from China, O. h. formosana from Taiwan, O. h. chiui from Taiwan and O. h. nosophora from Japan). The phylogenetic tree also showed that O. minima was placed as sister to all of the subspecies of O. hupensis. Possible evolutionary relationships amongthe snail hosts were discussed.

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