Fig. 21. A in Widespread polytypic species or complexes of local species? Revising bumblebees of the subgenus Melanobombus world-wide (Hymenoptera, Apidae, Bombus)

Fig. 21. A sample of 10 000 species trees from among 100 million trees for species of the subgenus Melanobombus von Dalla Torre, 1880 reconstructed with *BEAST from gene trees for the COI, 16S, opsin and PEPCK genes, displayed in green using Densitree, with the summary 'root canal' superimposed as a thick blue line. The outgroup B. nobilis Friese, 1905 is shown.