Primitive Insects

Other similar-appearing lower animals are often confused with insects. A jointed body, legs, and a "crawly" countenance are all that are required for many people to lump a wide variety of terrestrial arthropods with the true insects. Furthermore, these groups, such as spiders and mites, are of popular interest and considerable economic significance. It is appropriate, therefore, to include these insectlike groups (Clarke 1973, Cloudsley-Thomp-son 1958, Kaestner 1968, Parker 1982) in this book. The fact that they merge evolu-tionarily with the primitive Hexapoda also justifies addressing them. They are discussed here, prior to the chapters on the insects themselves.

References

Brusca, R. C., and G.J. Brusca. 1990. Invertebrates. Sinauer, Sunderland, Mass. Clarke, K. U. 1973. The biology of the Arthro-

poda. American Elsevier, New York. Cloudsley-Thompson, J. L. 1958. Spiders, scorpions, centipedes and mites. Pergamon, London.

Kaestner, A. 1968. Invertebrate zoology, arthropod relatives, Chelicerata, Myriapoda. Vol. 2. Wiley Interscience, New York. Parker, S. P., ed. 1982. Synopsis and classification of living organisms. Vol. 2. McGraw Hill, New York.

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