Figure 10. Expression patterns of regulatory genes and variation of melanisation in metasomal segments.

A. Expression patterns of engrailed (en), wingless (wg) and decapentaplegic (dpp) on an abdominal tergum of Drosophila (modified from [75], after [72], [74]). B. Variation of melanisation of the third metasomal tergum of V. velutina. The blue dotted lines represent the part of the segment covered by the second tergum.