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LATERALIZATION AND THE INVERTEBRATE NERVOUS SYSTEM: DISCUSSION *

While there is asymmetry in the nervous system of several invertebrates and asymmetry in CNS-regulated motor behavior, there appears to be little evidence for lateralization, which Webster’ defines as “preference in use of homologous parts on one lateral half’of the body over those on the other: dominance in function of one of a pair of lateral homologous parts.” The frequent example in vertebrates is handedness; and there is evidence for developmental changes in ontogeny and evolution. The cross-spider, Araneus diadematus Clerck, leaves a daily record of intricately patterned motor behavior in the orb web; the webgeometry is highly independent of experience2 and it is oval asymmetric in the