Figure 1 from: Liston A, Mutanen M, Viitasaari M (2019) On the taxonomy of Heterarthrus (Hymenoptera, Tenthredinidae), with a review of the West Palaearctic species. Journal of Hymenoptera Research 72: 83-126. https://doi.org/10.3897/jhr.72.39339

Figure 1 Neighbour-Joining tree of West Palaearctic Heterarthrus species based on the barcoding region of the mitochondrial COI gene of 92 specimens of Heterarthrus and Anheterarthrus. The height of the terminal triangles is proportional to the number of individuals (shown in parentheses), the depth of the triangles to variation within the lineage. For the species feeding on Acer spp. each specimen is shown as the species in this complex do not form clearly distinct clusters.