Abstract
ABSTRACT Old and new data on the segmentation process in arthropods are considered mainly with reference to the genetical basis of segmentation in Drosophila. Problems discussed are the universality (or otherwise) of parasegmental metamery, homeotic genes in insects other than Drosophila, pair-rule traits in myriapods, various segmentation anomalies related to polar morphogenetic centres, and sequential segment determination in the horseshoe crab. The opening and closing paragraphs address the conceptual and terminological progress from the study of ‘developmental monsters’ to the study of ‘developmental genes’ as a means of analysing segmentation.
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