Abstract
The bilateral symmetry of the larval body may arise epigenetically even in animal forms with bilaterally symmetrical eggs. In insects, this can be shown by development of parallel twins from eggs or early embryos split along their midlines. The present contribution explores the possibility that epigenetic symmetrization is based on circular asymmetries pre-existing in the egg cell. This possibility is suggested by phylogenetic considerations and by data based on epimorphic regeneration of larval appendages. The author proposes an experimental test discriminating between circular and bilaterally symmetrical prepatterns in primitive insects.
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