Fig. 4

Bayesian phylogenetic tree based on morphological characters. The large black dots show the age of the Kachin amber species; the branch nodes of this phylogenetic tree are not time-calibrated, the geological time scale refers only to the fossil taxa. The numbers on the branch nodes are posterior probabilities. Green branches: Chrysidoidea; blue branches: Vespoidea; orange branches: Apoidea. Families with habitus images associated indicated in purple: †Sirenobethylus charybdis (Sirenobethylidae), Chrysis ignita (Chrysididae), Pristocera depressa (Bethylidae), Embolemus ruddii (Embolemidae), Rhopalomutilla carinaticeps (Mutillidae), Polistes nimpha (Vespidae), Scolia quadripunctata (Scoliidae), Formica rufa (Formicidae)