The responses ofDasychone cingulata grube to photic stimulation

  • R. Theodore Srinivasagam


1. When kept in light,Dasychone cingulata Grube exhibits two types of movements: (i) complete retraction into the tube and (ii) movement of the branchial crown or branchial filaments.

2.Dasychone contracts into its tube when a shadow is passed on it. This behaviour is more pronounced in the higher intensities than in the lower intensities of light. It not only responds to a decrease but also to an increase in intensity and the contraction to a passing shadow is greater in a white background than in a black background.

3. Adaptation to continuous passing of shadows is rapid. Dark adapted forms readily respond to shadow than the light-adapted forms and the duration of adaptation in any particular intensity is also correlated to it.

4. The range of spectral sensitivity is wide inDasychone but is least sensitive in red light.

5. The above experimental results as well as the significance of the contraction ofDasychone into its tube have been discussed.


White Background Giant Axon Photic Stimulation Sudden Contraction Branchial Crown 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Bohn, G... “Contribution a la psychologie des annelides,”Bull. Inst. Gen. Psychol., 1902,2, 317–25 (in Jenkins, 1940).Google Scholar
  2. Buddenbrock, W. von.. “Über die Funktion der Statocysten in Sande grabender Meerestiere,”Zool. Jahrb., 1913,33, 441–82.Google Scholar
  3. ----- ..Grundriss der vergleichenden Physiologie, Berlin, 1928.Google Scholar
  4. —————.. “Untersuchungen über den schattenreflex,”Z. vergl. Physiol. 1930,13, 164–213.Google Scholar
  5. Carthy, J. D...An Introduction to Behaviour of Lower Invertebrates, Allen and Unwin, London, 1959.Google Scholar
  6. Clark, R. B... “The eyes and the photonegative behaviour of Nephtys (Annelida, Polychæta),”J. exp. Biol., 1956,33, 461–77.Google Scholar
  7. Foh, H... “Der Schattenreflex inHelix pomatia. Nebst Bemerkungen über den Schattenreflex inMytilus edulis, Limnæa stagnalis andTestudo ibera,”Zool. Jb. (Abt. 3), 1932,52, 1–78.Google Scholar
  8. Fox, H. M... “On the blood circulation and metabolism of Sabellids,”Proc. Roy. Soc Lond., 1938,125 B, 554–69.CrossRefGoogle Scholar
  9. Hargitt, C. W... “Experiments on the behaviour of tubicolous annelids,”J. Exp. Zool., 1906,3, 295–320.CrossRefGoogle Scholar
  10. ----- .. “Behaviour of tubicolous organisms,”Proc. Seventh Int. Zool. Congr., 1909, p. 6.Google Scholar
  11. —————.. “Further observations on the behaviour of tubicolour annelids.”J. Exp. Zool., 1909,7, 157–87.CrossRefGoogle Scholar
  12. —————.. “Observations on the behaviour of tubicolous annelids III,”Biol. Bull., 1912,22, 67–94.CrossRefGoogle Scholar
  13. Hess, C... “Untersuchungen über den Lichtsinn mariner Wurmer und Krebse,”Pfluger’s Arch. ges. Physiol., 1914,155, 421–35.CrossRefGoogle Scholar
  14. Loeb, J. .. “Further observations on the heliotropism of animals and its identity with the heliotropism of plants,” InStudies in General Physiology, Part I, 1906, 89–106, London and Chicago.Google Scholar
  15. ----- ..Forced Movements, Tropisms and Animal Conduct, London. 1918.Google Scholar
  16. Millott, N... “Sensitivity to light and the reactions to changes in light intensity of the echinoidDiadema antillarum Philippi,”Phil. Trans., 1954,238 B, 187–220.Google Scholar
  17. —— and Yoshida, M... “The shadow reaction ofDiadema antillarum Philippi, I. The spine response and its relation to the stimulus,”J. Exp. Biol., 1960,37, 363–75.Google Scholar
  18. Nicol, J. A. C... “The giant axons of annelids,”Quart. Rev. Biol., 1948,23, 291–323.PubMedCrossRefGoogle Scholar
  19. —————.. “Responses ofBranchiomma vesiculosum (Montagu) to photic stimulation,”J. mar. biol. Ass. U.K. 1950,29, 303–20.CrossRefGoogle Scholar
  20. —————..‘Photoreception’ in the Biology of Marine Animals, Sir Isac Pitman & Sons, London, 1960, 305–24.Google Scholar
  21. —— and Young, J. Z... “Giant nerve fibre ofMyxicola infundibulum (Grube)”,Nature, Lond., 1946,158, 167–68.CrossRefGoogle Scholar
  22. Pantin, C. F. A... “Behaviour patterns in lower invertebrates,”Symp. Soc. Exp. Biol., 1950,4, 175–95.Google Scholar
  23. Smith, J. E... “The nervous anatomy of the body segments of nereid polychætes,”Phil. Trans. Roy. Soc., Lond., 1957,240, 135–96.CrossRefGoogle Scholar
  24. Srinivasagam, R. Theodore.. “Reaction to shadow inDasychone cingulata Grube (Polychæta),”Curr. Sci., 1961,30, 196.Google Scholar
  25. Steven, G. A... “Bottom fauna and the food of fishes,”J. mar. biol. Ass U.K., 1930,16, 677–706.CrossRefGoogle Scholar
  26. Tampi, P. R. S... “On the eyes of polychætes,”Proc. Ind. Acad. Sci., 1949,29 B, 129–47.Google Scholar
  27. Uexkull, J. von.. “Die Wirkung von Licht und Schatten auf die Seeigel,”Z. Biol., 1900,40, 447–76.Google Scholar
  28. Ullyott, P... “The behaviour ofDendrocælum lacteum. I. Responses at light and dark boundaries,”J. Exp. Biol., 1936,13, 253–64.Google Scholar
  29. Vijayamma Thomas .. “Anatomy and development ofDasychone cingulata,”M.Sc. Thesis, Madras University (and literature cited therein), 1955.Google Scholar
  30. Wells, G. P... “Spontaneous activity cycles in polychæte worms,”Symp. Soc. Exp. Biol., 1950,4, 127–42.Google Scholar
  31. —————.. “On the behaviour ofSabella,”Proc. Roy. Soc. Lond., 1951,138 B, 278–99.CrossRefGoogle Scholar
  32. Wilson, D. P. ..Life of the Shore and Shallow Sea, London, 1935.Google Scholar
  33. Young, J. Z... “The functioning of the giant nerve fibres of the Squid,”J. Exp. Biol., 1938,15, 170.Google Scholar
  34. —————.. “Giant nerve fibres,”Endeavour, 1944,3, 108–13.Google Scholar

Copyright information

© Indian Academy of Sciences 1961

Authors and Affiliations

  • R. Theodore Srinivasagam
    • 1
  1. 1.Zoological Research LaboratoryUniversity of MadrasMadras

Personalised recommendations