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Gap genes are involved in segment determination during early development of the vinegar fly  Drosophila melanogaster  and other dipteran insects (flies, midges and mosquitoes). They are expressed in overlapping domains along the antero-posterior (A–P) axis of the blastoderm embryo. While gap domains cover the entire length of the A–P axis in  Drosophila,  there is a region in the blastoderm of the moth midge  Clogmia albipunctata , which lacks canonical gap gene expression. Is a non-canonical gap gene functioning in this area? Here, we characterize  tarsal-less  ( tal ) in  C. albipunctata . The homologue of  tal  in the flour beetle  Tribolium castaneum  (called  milles-pattes, mlpt ) is a  bona fide  gap gene. We find that  Ca-tal  is expressed in the region previously reported as lacking gap gene expression. Using RNA interference, we study the interaction of  Ca-tal  with gap genes. We show that  Ca-tal  is regulated by gap genes, but only has a very subtle effect on  tailless (Ca-tll),  while not affecting other gap genes at all. Moreover, cuticle phenotypes of  Ca-tal  depleted embryos do not show any gap phenotype. We conclude that  Ca-tal  is expressed and regulated like a gap gene, but does not function as a gap gene in  C. albipunctata .

tarsal-lessis expressed as a gap gene but has no gap gene phenotype in the moth midgeClogmia albipunctata