Russian Journal of Marine Biology

, Volume 35, Issue 1, pp 34–40 | Cite as

Ultrastructure of larval epidermis of the nemertean Quasitetrastemma stimpsoni (Chernyshev, 1992) (Hoplonemertea)

Invertebrate Zoology

Abstract

The ultrastructure of the epidermis of free-swimming larvae of the nemertean Quasitetrastemma stimpsoni was examined. At about 24 hours after hatching, the provisional epithelium of larva is 28–35 μm thick and consists of two layers of cells—peripheral and basal. The peripheral layer consists of multiciliated cells and two kinds of gland cells. The “basal cup” zone is formed from the vacuoles of basal cells. At about 50 hours after hatching, the definitive epithelium is 14–17 μm thick and exhibits a typical hoplonemertean structure. However, it has numerous yolk vesicles, few processes of granular basal cells, and a weakly developed dermis. Thus, the replacement of the provisional epithelium by the definitive one occurs in Q. stimpsoni at an earlier stage, compared to the hidden larva of Tetrastemma candidum.

Key words

nemerteans larval development provisional epithelium 

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References

  1. 1.
    Ivanova-Kazas, O.M., Evolyutsionnaya embriologiya zhivotnykh (Evolutionary Embryology of Animals), St. Petersburg: Nauka, 1995.Google Scholar
  2. 2.
    Lebedinskii, Ya.N., Observations on the Ontogenesis of Nemerteans, Zap. Novoros. ob-va estestvoispyt., 1898, vol. 22, pp. 1–124.Google Scholar
  3. 3.
    Maslakova, V.V. and Malakhov, S.A., Nemerteans of the Order Hoplonemertini Have a Hidden Larva, Dokl. RAN, 1999, vol. 366, no. 6, pp. 849–852.Google Scholar
  4. 4.
    Chernyshev, A.V., Larval Development of Nemerteans of the Genus Quasitetrastemma (Nemertea: Monostilifera), Biol. Morya, 2008, vol. 34, no. 4, pp. 301–304.Google Scholar
  5. 5.
    Friedrich, H., Nemertini, Morphogenese der Tiere, Seidel, F. (Ed.), Jena: Gustav Fischer, 1979, vol. 3, issue 5-1, pp. 1–136.Google Scholar
  6. 6.
    Gibson, R., Nemerteans, London: Hutchinson, 1972.Google Scholar
  7. 7.
    Hickman, V.V., The Occurrence in Tasmania of the Land Nemertine, Geonemertes australiensis Dendy, With Some Account of its Distribution, Habits, Variations and Development, Papers Proc. Roy. Soc. Tasmania, 1963, vol. 97, pp. 63–75.Google Scholar
  8. 8.
    Iwata, F., Studies on the Comparative Embryology of Nemerteans with Special Reference to Their Interrelationships, Publ. Akkeshi Mar. Biol. Stat., 1960, no. 10, pp. 1–51.Google Scholar
  9. 9.
    Norenburg, J.L., Structure of the Nemertine Integument with Consideration of Its Ecological and Phylogenetic Significance, Am. Zool., 1985, vol. 25, pp. 37–51.Google Scholar
  10. 10.
    Pedersen, K.J., Some Morphological and Histochemical Aspects of Nemertean Connective Tissue, Z. Zellforsch., 1968, vol. 90, pp. 570–595.PubMedCrossRefGoogle Scholar
  11. 11.
    Reinhardt, H., Beiträge zur Entwicklungsgeschichte der einheimischen Süsswassernemertine Prostoma graecense (Böhmig), Vierteljahrsschrift der Naturforschenden Gesellschaft in Zürich, 1941, vol. 86, pp. 184–255.Google Scholar
  12. 12.
    Stricker, S.A. and Reed, C.G., Larval Morphology of the Nemertean Carcinonemertes epialti (Nemertea: Hoplonemertea), J. Morph., 1981, vol. 169, pp. 61–70.CrossRefGoogle Scholar
  13. 13.
    Turbeville, J.M., Nemertinea, Microscopic Anatomy of Invertebrates, vol. 3: Platyhelminthes and Nemertinea, New York: Wiley-Liss., 1991, pp. 285–328.Google Scholar
  14. 14.
    Turbeville, J.M. and Ruppert, E.E., Comparative Ultrastructure and the Evolution of Nemertines, Am. Zool., 1985, vol. 25, pp. 53–71.Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  1. 1.Zhirmunsky Institute of Marine Biology, Far East DivisionRussian Academy of SciencesVladivostokRussia

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