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Since empty-spiracles (ems) was identified and characterized in Drosophila melanogaster as a head-gap gene, several studies have been carried out in other insect orders to confirm its evolutionary conserved function. Using the blood-sucking bug Rhodnius prolixus as biological model, we found an ems transcript with three highly conserved regions Box-A, Box-B, and the homeodomain. R. prolixus embryos silenced by parental RNAi for two of these ems conserved regions showed both maternal and zygotic defects. Rp-emsB fragment results in early le