Fig. 7. Schematic diagram of PgIII expression and segment identity in the anterior segmented germ band in Drosophila, Schistocerca and Tetranychus. Dotted horizontal lines define the boundaries of homologous segments in insects and chelicerates as described by Damen et al. (Damen et al., 1998) and Telford and Thomas (Telford and Thomas, 1998). Solid horizontal lines represent parasegment boundaries in Drosophila, and possible parasegment boundaries in Schistocerca and Tetranychus. Solid green bars represent engrailed expression in Drosophila; solid blue bars represent primary stripes of PgIII genes; hatched blue bars represent secondary stripes. Pair-rule modulated stripes of PgIII genes in insects and Tetranychus form with a different register.

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