<i>Haemaphysalis japonica</i>, <i>Haemaphysalis jezoensis</i> and “<i>Haemaphysalis douglasi</i>” (Acari: Ixodidae): Which tick is distributed in Hokkaido?

DOI Web Site 2 References
  • NAKAO Minoru
    Department of Parasitology, Asahikawa Medical University
  • ITO Takuya
    Department of Infectious Diseases, Hokkaido Institute of Public Health

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Other Title
  • <i>Haemaphysalis japonica</i>, <i>Haemaphysalis jezoensis</i>, “<i>Haemaphysalis douglasi</i>”（ダニ目マダニ科）：北海道にはどの種が分布しているのか？
  • Haemaphysalis japonica, Haemaphysalis jezoensis and "Haemaphysalis douglasi" (Acari: Ixodidae) : Which tick is distributed in Hokkaido?
  • Haemaphysalis japonica, Haemaphysalis jezoensis and ^|^#8220;Haemaphysalis douglasi^|^#8221; (Acari: Ixodidae): Which tick is distributed in Hokkaido?

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Abstract

As a general view, the ixodid tick Haemaphysalis japonica is distributed in Japan (Kyushu, Honshu and Hokkaido islands) and in a continental area including Russia Primorsky Krai, eastern China and the Korean Peninsula. The continental population is treated as a subspecies, Haemaphysalis japonica douglasi. The Hokkaido population was once named Haemaphysalis jezoensis, but synonymized with H. japonica. An irregular taxonomic revision, however, elevated H. japonica douglasi to specific rank for the continental and Hokkaido populations. The resultant “Haemaphysalis douglasi” sensu Kitaoka is obviously invalid because of the lack of taxonomic literatures about its specific status. Even in the present time, the invalid name has yet been used for tick identification in Hokkaido. In this study, nucleotide sequences of mitochondrial DNA (large subunit ribosomal RNA gene) and nuclear DNA (internal transcribed spacer 2) were compared between adult samples of H. japonica from Honshu and those of “H. douglasi” from Hokkaido. The target sequences of the Hokkaido samples were completely identical with those of the Honshu samples, indicating that the elevation of H. japonica douglasi to specific rank or the resurrection of H. jezoensis is an inadequate treatment. The result clearly shows that H. japonica is distributed in Hokkaido.

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