Advertisement

Species Differentiation and Ecological Relations of Planarians

  • Roman Kenk

Abstract

The planarians, or freshwater triclads, belong, in the zoological classification, to the class Turbellaria (free-living flatworms) of the phylum Platyhelminthes. Thus they are among the lowest, or most primitive, Metazoa with bilateral symmetry and a centralized nervous system. This primitiveness in their structure and, presumably, physiology makes them eminently suitable for the study of many fundamental biological phenomena of a general nature, applicable in many ways to higher animals as well. They have long been favored experimental animals in laboratories. The classical studies of the principles of regeneration (T. H. Morgan, C. M. Child, and many other investigators, see Brøndsted, 1955) were made on planarians. Other investigations in which planarians played a prominent role were studies of the differential action of radiations on various types of cells and tissues (C. R. Bardeen, W. C. Curtis, F. Stéphan-Dubois, etc.), effects of pharmacological and carcinogenic agents (many investigations widely scattered in the literature), the morphogenetic interrelations of various organs during their development (E. Wolff and his collaborators), and relations of cytogenetics to speciation (M. Benazzi and his school). During the last decade we have seen a very intensive upswing in behavioral studies performed on planarians, centering on the mechanisms and possible biochemical correlates of learning and memory, which are the topics of the present symposium.

Keywords

Adhesive Organ Ecological Relation Freshwater Planarian Present Symposium Spring Brook 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Bardeen, C. R., and F. H. Baetjer, The inhibitive action of the Roentgen rays on regeneration in planarians. J. Exp. Zool., 1904, 1, 191.CrossRefGoogle Scholar
  2. Benazzi, M., Evoluzione cromosomica e differenziamento razziale e specifico nei tricladi, in Evoluzione e Genetica, Colloquio internazionale, Roma, 1959. Accad. naz. Lincei, Problemi attuali di Scienza e di Cultura, Quad., 1960, 47, 273.Google Scholar
  3. Brøndsted, H. V., Planarian regeneration. Biol. Rev., 1955, 30, 65.CrossRefGoogle Scholar
  4. Curtis, W. C., and J. Hickman, The effects of X-rays upon regeneration in planarians. Science, 1926, 63, 505.CrossRefGoogle Scholar
  5. DeBold, R. C., W. R. Thompson, and C. Landraitis, Differences in responses to light between two species of planaria: Dugesia tigrina and D. dorotocephala Psychonomic Sci., 1965, 2, 79.Google Scholar
  6. Dubois (later Stéphan-Dubois), F., and E. Wolff, Sur une méthode d’irradiation localisée permettant de mettre en évidence la migration des cellules de régénération chez les planaires. C. R. Soc. Biol. (Paris), 1947, 141, 903.Google Scholar
  7. Hyman, Libbie H., Turbellaria (flatworms), in R. W. Pennak, ed., Fresh-Water Invertebrates of the United States. New York: The Ronald Press Company, 1953, p. 114.Google Scholar
  8. Wolff, E., and T. Lender, Les néoblastes et les phénomènes d’induction et d’inhibition dans la régénération des planaires. Année biol., 1962, (4)1, 499.Google Scholar

Copyright information

© Springer Science+Business Media New York 1967

Authors and Affiliations

  • Roman Kenk
    • 1
  1. 1.Division of WormsSmithsonian InstitutionUSA

Personalised recommendations