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Hydrobiologia

, Volume 383, Issue 1–3, pp 315–320 | Cite as

Chromosomes of Phagocata kawakatsui and Bdellocephala annandalei from Lake Biwa-ko in Honshú, central Japan

  • Iwashiro Oki
  • Sachiko Tamura
  • Machiko Nishino
  • Masayuki Takai
  • Konstantin D. Kuznedelov
  • Oleg A. Timoshkin
  • Masaharu Kawakatsu
Article

Abstract

Two lake-dwelling species of paludicolen triclads from Lake Biwa-ko (Honshû, Japan) were studied taxonomically and karyologically. (1) Phagocata kawakatsui Okugawa, 1956, is an epigean species usually inhabiting shallow springs and spring-fed streams in Central Japan. In Lake Biwa-ko, animals were obtained from several bottom stations of the littoral area in the southern part of the northern basin (3–70 m in depth). Chromosome numbers and karyotype: 2x=24 (2m+2sm+2sm+2m+2sm+2m+2sm+2m+2m+2sm+2m+2m). The first pair of metacentric chromosomes is very large in size. (2) Bdellocephala annandalei Ijima et Kaburaki, 1916, an endemic species, is distributed widely in the deep areas of the northern basin (30 to over 100 m in depth). Chromosome numbers and karyotype: 2x=28 (2m+2sm+2sm+2sm+2sm+2m+2m+2m+2m+2m+2m+2m+2m+2m) with the first pair of metacentric chromosomes very long.

Turbellaria Tricladida Phagocata Bdellocephala karyology Lake Biwa Japan 

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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Iwashiro Oki
    • 1
  • Sachiko Tamura
    • 2
  • Machiko Nishino
    • 3
  • Masayuki Takai
    • 4
  • Konstantin D. Kuznedelov
    • 5
  • Oleg A. Timoshkin
    • 6
  • Masaharu Kawakatsu
    • 4
  1. 1.Suina-ku, KôbeJapan
  2. 2.NeyagawaJapan
  3. 3.Lake Biwa Research InstituteÔtsuJapan
  4. 4.Biological LaboratoryMedical SchoolJapan
  5. 5.Laboratory of Molecular Limnological Institute, Russian Academy of SciencesUlanbatorskaya, IrkutskRussia
  6. 6.Center for Ecological ResearchKyoto UniversityShimo-sakamoto, Ôtsu ShigaJapan

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