Correlation between the presence/absence of Wnt6 and maxillary palps in insects. Simplified phylogenetic tree of hexapoda, based on . The presence or absence of maxillary palps and Wnt6 are indicated on the right. The insect species with whole genome information are listed. n.a. – no genomic information available. The position of hemiptera nested within groups with maxillary palps indicate that the absence of maxillary palps in this group is due to evolutionary loss.