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Hydrobiologia

, Volume 227, Issue 1, pp 157–162 | Cite as

Karyological and taxonomic studies of Dugesia japonica from the Southwest Islands of Japan-II

  • Sachiko Tamura
  • Iwashiro Oki
  • Masaharu Kawakatsu
Karyology

Abstract

The karyotypes of Dugesia japonica from the southern part of the Southwest Islands of Japan (the Nansei Shotô) include diploidy, triploidy, mixoploidy, and mixoaneuploidy. Animals having karyotypes based on n = 8 were found on Okinawa Island, Ishigaki Island, Iriomote Island, and Yonaguni Island, while animals having karyotypes based on n = 7 were found on Okinawa Island, Miyako Island, and Ishigaki Island. Toward the northern end of this island chain, at Tanegashima Island, Yakushima Island, and Amami-Ôshima Island, karyotypes based on n = 8 occurred; and on one of these, Tanegashima Island, n = 7 also occurred. Our data provide further support of the karyotypical distinction between the two subspecies of D. japonica: D. j. japonica has karyotypes based on n = 8 and D. j. ryukyuensis has karyotypes based on n = 7. Taking into consideration the geological history of the Southwest Islands and the ties of their faunas to those of adjacent areas, we can explain the current geographical distribution of the two subspecies in these islands as the result of two separate invasions by D. japonica, one in the Miocene and one after the early Quaternary.

Key words

Turbellaria Tricladida Dugesia karyology taxonomy Japan 

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References

  1. Ichikawa, A. & M. Kawakatsu, 1964. A new freshwater planarian, Dugesia japonica, commonly but erroneously known as Dugesia gonocephala (Dugès). Annot. zool. Japon. 37: 185–194. xKawakatsu, M. & D.-Z. Liu, 1987. History of the study of Turbellaria in China. Part 3. Supplementary notes on the turbellariology in the People's Republic of China. Bull. Fuji Women's College, no. 25, ser. II: 39–54. xKawakatsu, M, I. Oki, S. Tamura & H. Sugino, 1976. Studies on the morphology, karyology and taxonomy of the Japanese freshwater planarian Dugesia japonica Ichikawa et Kawakatsu, with a description of a new subspecies, Dugesia japonica ryukyuensis subspec. nov. Bull Fuji Women's College, no. 14, ser. II: 81–126. xKawakatsu, M., I. Oki, S. Tamura, R. E. Ogren, T. Yamada & H. Murayama, 1990. Preprint of papers given at the Sixth International Symposium on the Turbellaria, Hirosaki, Japan. Occ. Publ. biol. Lab. Fuji Women's College, Sapporo (Hokkaidô), Japan, no 22: 1–16.Google Scholar
  2. Kizaki, K., et al., 1980. In K. Kizaki (ed.), Ryûkû no Shizen. [The nature of Ryûkû, Japan.] Tsukiji Shokan Publ. Co., Ltd, Tôkyô, iii + 282 pp. [In Japanese]Google Scholar
  3. Minato, M., et al., 1973. In M. Minato (ed.), Me de Miru Nihon-Rettô no Oitachi. [An explanatory leaflet with thirty sets of palaeogeographical maps and fossils of the Japanese Islands, in color.] Tsukiji Shokan Publ. Co., Ltd, Tôkyô, 12 pp. + 60 maps. [In Japanese]Google Scholar
  4. Oki, I. S. Tamura, T. Yamayoshi & M. Kawakatsu, 1980. Preprint of a paper given at the Third International Symposium on the Biology of the Turbellaria in Honour of Prof. Tor G. Karling, Hasselt (Diepenbeek), Belgium. Occ. Publ. biol. Lab. Fuji Women's College, Sapporo (Hokkaidô), Japan, no. 2: 1–23.Google Scholar
  5. Porfirjeva, N. A. & O. A. Timoshkin, 1984. K faune planarii (Tricladida, Paludicola) Sikhote-Alinia. Biol. Presnykh vod Dal'nego Vostoka-Sieornik Nauchnykh Trudov., Akad. Nauk SSSR, Dal'nevostochnyi Nauchnyi Tsentr, Biol. Inst., Vladivostok: 62–68. [In Russian]Google Scholar
  6. Tamura, S., I. Oki & M. Kawakatsu, 1988. Karyological and taxonomic studies of Dugesia japonica from the Southwest Islands of Japan. Fortschr. Zool. 36: 123–128.Google Scholar
  7. Tamura, S., I. Oki & M. Kawakatsu, 1989. Karyological and taxonomic studies of the Dugesia species in Southeast Asia. XV. Chromosomes of Dugesia japonica from the Southwest Islands of Japan. Zool. Sci. (Tôkyô) 6: 1221.Google Scholar
  8. Tamura, S., I. Oki & M. Kawakatsu, 1990. Karyological study of Dugesia japonica, I. Karyotypes of animals collected from the Southwest Islands of Japan. La Kromosomo (Tôkyô) II-57 (1990): 1937. [In Japanese]Google Scholar

Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • Sachiko Tamura
    • 1
  • Iwashiro Oki
    • 2
  • Masaharu Kawakatsu
    • 3
  1. 1.Ôsaka Prefectural Institute of Public HealthÔsakaJapan
  2. 2.Ôsaka Environmental Project Authority, MFC 7FÔsakaJapan
  3. 3.Biological LaboratoryFuji Women's CollegeSapporo (Hokkaidô)Japan

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