Bayesian phylogenetic tree inferred in MrBayes using amino acid sequences of 13 PCGs (left), and gene order comparisons for the stylommatophoran mitogenomes (right). Numbers at the nodes in the tree are Bayesian posterior probabilities (PP > 0.9). Blue indicates the newly sequenced species. The branch of Cepaea nemoralis is depicted as half of its original branch length. Scale bar represents substitutions/site. In the mitogenome structure maps, gene rearrangements are highlighted by red.