Advertisement

Cell and Tissue Research

, Volume 171, Issue 4, pp 523–533 | Cite as

Fine structure of the ocellus of the cabbage looper moth (Trichoplusia ni)

  • Matthew A. Dow
  • John L. Eaton
Article

Summary

The dorsal ocelli of adult cabbage looper moths were studied by light microscopy, and scanning and transmission electron microscopy. Each ocellus has a cuticular lens located on the distal end of a cuticular cone which encapsulates the receptor cells. There are two distinct types of receptor cells in the ocellus. Seventy large receptor cells form plate-like rhabdoms with several adjacent cells to produce a rhabdom network in the ocellus. Proximally ninety small receptor cells which have a disorganized microvillar rhabdomere are located at the base of the rhabdoms formed by the large cells. Extensive areas of gap junctions which occur between the rhabdoms and the membranes of large and small cells suggest that the cells may be electrically coupled to one another. Axons from both large and small receptor cells leave the base of the ocellus and extend to the protocerebrum to synapse with second order neurons.

Key words

Dorsal ocellus Cabbage looper moth Fine structure 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Cajal, S.R.: Observaciones sobre la estructura de los ocelos y vias nerviosas ocelares de algunos insectos. Trab. Lab. Invest. biol. Univ. Madr. 16, 109–139 (1918)Google Scholar
  2. Chappell, R.L., Dowling, J.E.: Neural organization of the median ocellus of the dragonfly. I. Intracellular electrical activity. J. gen. Physiol. 6, 121–147 (1972)Google Scholar
  3. Cooter, R.J.: Ocellus and ocellar nerves of Periplaneta americana L. (Orthoptera). Int. J. Insect Morph. Embryol. 4, 273–288 (1975)Google Scholar
  4. Dickens, J.C., Eaton, J.L.: External ocelli are present in many lepidoptera previously considered to be anocellate. Nature (Lond.) 242, 205–207 (1973)Google Scholar
  5. Dickens, J.C., Eaton, J.L.: Fine structure of ocelli in sphinx moths. Tissue and Cell 6, 463–470 (1974)Google Scholar
  6. Eaton, J.L.: Insect photoreceptor: An internal ocellus is present in sphinx moths. Science 173, 822–823 (1971b)Google Scholar
  7. Eaton, J.L.: Electroretinogram components of the ocellus of the adult cabbage looper moth Trichoplusia ni. J. Insect Physiol. 21, 1511–1516 (1975)Google Scholar
  8. Eaton, J.L.: Spectral sensitivity of the ocelli of the adult cabbage looper moth. J. comp. Physiol. (In Press, 1976)Google Scholar
  9. Fahrenbach, W.H.: The morphology of the eyes of Limulus. II. Ommatidia of the compound eye. Z. Zellforsch. 93, 451–483 (1969)Google Scholar
  10. Fahrenbach, W.H., Griffin, A.J.: The morphology of the Limulus visual system. VI. Connectivity in the ocellus. Cell Tiss. Res. 159, 39–47 (1975)Google Scholar
  11. Goodman, L.J.: The structure and function of the insect dorsal ocellus. In: Advances in insect physiology, Vol. 7. (eds. J.W.L. Beament, J.E. Treherne, and V.B. Wigglesworth), pp. 97–195. London and New York: Academic Press, 1970Google Scholar
  12. Henneberry, T.J., Kishaba, A.N.: Cabbage loopers. In: Insect colonization and mass production (ed. C.N. Smith), pp. 461–478. New York: Academic Press, 1966Google Scholar
  13. Horridge, G.A., Barnard, P.B.T.: Movement of palisade in locust retinula cells when illuminated. Quart. J. micr. Sci. 106, 131–135 (1965)Google Scholar
  14. Jeon, K.W.: Simple method for staining and preserving epoxy resin embedded animal tissue sections for light microscopy. Life Sci. 4, 1839–1841 (1965)Google Scholar
  15. Jones, C., Nolte, J., Brown, J.E.,: The anatomy of the median ocellus of Limulus. Z. Zellforsch. 118, 297–309 (1971)Google Scholar
  16. Link, E.: Über die Stirnaugen der Neuropteren und Lepidopteren. Zool. Jb. (Abt. 2. Anal.) 27, 213–240 (1909)Google Scholar
  17. Redikorzew, W.: Untersuchungen über den Bau der Ocellen der Insekten. Z. wiss. Zool. 68, 581–625 (1900)Google Scholar
  18. Ruck, P., Edwards, G.A.: The structure of the insect dorsal ocellus. I. General organization of the ocellus in dragonflies. J. Morph. 115, 1–25 (1964)Google Scholar
  19. Toh, Y., Kuwabara, M.: Fine structure of the dorsal ocellus of the worker honeybee. J. Morph. 143, 285–306 (1974)Google Scholar
  20. Toh, Y., Tominaga, Y., Kuwabara, M.: Fine structure of the dorsal ocellus of the fleshfly. J. Electron Microscopiy 20, 56–66 (1971)Google Scholar
  21. Venable, J.H.,: Coggeshall, R.: A simplified lead citrate stain for use in electron microscopy. J. Cell Biol. 25, 407–408 (1965)Google Scholar
  22. Walcott, B.: Anatomical changes during light-adaptation in insect compound eyes. In: The compound eye and vision of insects (ed. G.A. Horridge). Oxford: Claredon Press 1975Google Scholar
  23. Watters, W.B., Buck, R.C.: An improved simple method of specimen preparation for replicas or scanning electron microscopy. J. Microscopic 94, 185–187 (1971)Google Scholar

Copyright information

© Springer-Verlag 1976

Authors and Affiliations

  • Matthew A. Dow
    • 1
  • John L. Eaton
    • 1
  1. 1.Department of EntomologyVirginia Polytechnic Institute and State UniversityBlacksburgUSA

Personalised recommendations