The comparison of gene expression patterns in a number of insect and crustacean species has led to some insight into the evolution of arthropod patterning mechanisms. These studies have revealed the fundamental nature of the parasegment in a number of organisms, shown that segments can be generated sequentially at the molecular level, and suggested that pair-rule pre-patterning might not be shared by all insects.
Keywords:
evolution,
segmentation,
Drosophila,
Manduca,
Tribolium,
Schistocerca,
Acheta,
Crustacea,
engrailed,
even-skipped
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