Fig. 2From: Deeply divergent sympatric mitochondrial lineages of the earthworm Lumbricus rubellus are not reproductively isolatedMaximum-likelihood tree based on the COI sequences of Lumbricus rubellus collected across Europe. Haplotypes observed in the studied Polish populations are marked with the labels H1-H27. Blue circle labels represent the haplotypes found in the TR population. Blue brackets represent the new mtDNA lineages (C2 and D2). The COI sequence of Hirudo medicinalis [GenBank: EF446709.1] was used as the outgroup to root the tree. Bootstrap percentages ≥ 50 are shown at the branch pointsBack to article page