The sister group relationship between Hesperiidae and Hedyl-idae was recovered in all three studies with moderate support in
Regier et al. (2009), and strong to very strong support in Mutanenet al. (2010) and Heikkilä et al. (2012). In previous studies no syn-apomorphies for the two families have been suggested, but Heikkilä et al. (2012) did find two unique synapomorphies that unite Hesperiidae and Hedylidae: