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Taxonomy and geographical distribution of Dugesia japonica and D. ryukyuensis in the Far East

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Abstract

Dugesia japonica Ichikawa et Kawakatsu, 1964, is a common and polymorphic species of freshwater planarian distributed widely in the Far East. In 1976 the geographic populations were separated into 2 subspecies (D.j.japonica and D.j. ryukyuensis). The taxonomy of this species is reconsidered once again from the morphological, anatomical, histological, and karyological viewpoints. From the result of these studies, D.j. ryukyuensis is elevated to the rank of species: D. ryukyuensis Kawakatsu, 1976. D. japonica (n = 8, 2x = 16, 3x = 24) differs from D. ryukyuensis (n = 7, 2x = 14, 3x = 21) in having an asymmetrical penis papilla without a well-developed valve surrounding its basal part, and a well-developed vagina (distribution: the Japanese Islands, Taiwan, the Korean Peninsula, China, and Primorskiy, Northeast Siberia, in Russia). D. ryukyuensis is characterized by an asymmetrical penis papilla with a well-developed valve surrounding its basal part, and a less-developed vagina (distribution: the Southwest Islands of Japan).

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Authors and Affiliations

  1. Biological Laboratory, Fuji Women's College, Kita-16, Nishi-2, Kita-ku, 001, Sapporo (Hokkaidô), Japan

    Masaharu Kawakatsu

  2. Ôsaka Environmental Project Association, Uchihon-machi 1-2-15, MFC 7F, 537, Chû'ô-ku, Ôsaka, Japan

    Iwashiro Oki

  3. Ôsaka Prefectural Institute of Public Health, Nakamichi-1-chôme 3-69, 537, Higashinari, Ôsaka, Japan

    Sachiko Tamura

Authors
  1. Masaharu Kawakatsu
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  2. Iwashiro Oki
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  3. Sachiko Tamura
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Kawakatsu, M., Oki, I. & Tamura, S. Taxonomy and geographical distribution of Dugesia japonica and D. ryukyuensis in the Far East. Hydrobiologia 305, 55–61 (1995). https://doi.org/10.1007/BF00036363

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