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Hydrobiologia

, Volume 305, Issue 1–3, pp 79–84 | Cite as

A review of chromosomal variation in Dugesia japonica and D. ryukyuensis in the Far East

  • Sachiko Tamura
  • Iwashiro Oki
  • Masaharu Kawakatsu
Biogeography and genetics

Abstract

The chromosome numbers of Dugesia japonica Ichikawa et Kawakatsu, 1964, are n = 8, 2x = 16 and 3x = 24; those of Dugesia ryukyuensis Kawakatsu, 1976, are n = 7, 2x = 14 and 3x = 21. The karyotypes of both species include diploid, triploid and mixoploid; aneuploidic and mixoaneuploidic karyotypes may occur. In 785 specimens studied of D. japonica, the occurrence rates of specimens having each karyotype are substantially the same (29–37%). Diploid sexual specimens represented nearly 10% of the total and virtually no triploid or mixoploid sexual specimens were found. The diploid karyotype can be inherited by both sexual and asexual reproduction; the triploid and mixoploid karyotypes will be inherited only by asexual reproduction. In 51 specimens studied of D. ryukyuensis, the different karyotypes are diploid (ca 39%), triploid (ca 57%) and mixoploid (ca 4%). Diploid sexual specimens represented nearly 25% of the total; sexual specimens with tripooidic karyotypes made up nearly 27%. The diploid, triploid and mixoploid karyotypes were also found in juveniles hatched from cocoons. The diploid karytyype is inherited by both sexual and asexual reproductions; the other karyotypes may be inherited by parthenogenesis or self-fertilization (including pseudogamy) and asexual reproduction.

Key words

Turbellaria Tricladida Dugesia karyology Japan 

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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • Sachiko Tamura
    • 1
  • Iwashiro Oki
    • 2
  • Masaharu Kawakatsu
    • 3
  1. 1.Ôsaka Prefectural Institute of Public HealthHigashinari-ku ÔsakaJapan
  2. 2.Ôsaka Environmental Project AssociationChu'ô-ku, ÔsakaJapan
  3. 3.Biological LaboratoryFuji Women's CollegeKita-ku, Sapporo (Hokkaidô)Japan

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