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Epilogue

  • M. A. Ali
Part of the NATO ASI Series book series (NSSA, volume 74)

Abstract

As mentioned in the Prologue, about 97% of the animal species are invertebrate ones. If the number of individuals could even be guessed, it would probably represent over 99,5%. Such a rich source of material presents also insurmountable problems for its study. Let me first enumerate the positive aspects. The extraordinarily wide taxonomic variety offered by the invertebrates permits not only the study of evolutionary aspects but also comparative and developmental ones. The fact that they occupy every conceivable habitat makes them the material of choice for studying adaptive features. The incredible diversity that one encounters in their structures allows the choice of particular structures for investigating a particular problem in physiology or experimental biology. These same advantages also pose the “insurmountable” problems referred to above. For example, it will be impossible to study the photoreceptors of the nearly million species. Also, it will be nearly impossible to collect them from all the habitas in which they occur and keep alive in the laboratory. Thus, the solution would appear to be to select judiciously representatives of different taxa inhabiting different habitats and having different habits and structures, depending on the question that one is trying to answer or, a problem to solve. Obviously, in this context it may be superfluous to mention that the criteria for selection would and should vary according not only to the problem but also the group that one is interested in.

Keywords

Spectral Sensitivity Visual Pigment Outer Plexiform Layer Polarisation Sensitivity Silk Moth 
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.

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Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • M. A. Ali
    • 1
  1. 1.Département de BiologieUniversité de MontréalMontréalCanada

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