Dendrogram showing similarity between species areas. Lennon’s index was used to calculate similarities, the dendrogram was created using UPGMA clustering. Yellow branch: species of Eastern Mediterranean, extending in Levant. Red branch: species present in the entire Ponto-Mediterranean area. Brown branch: Species that extended their range and are present even in central and northern Europe. Blue branch: Vespa crabro mimicry ring with Volucella inanis.