Maximum likelihood (ML) tree of mitochondrial genomes of species representing the superfamily Helicoidea (see Table 1). Mitogenome sequences included all PCGs (except atp8) and two rRNA genes were 14,287 positions in length. Ultrafast bootstrap support values (%), SH-aLRT support values (%) and Bayesian posterior probabilities are indicated next to the branches. The tree was rooted with sequences of Arion vulgaris (MN607980) and Meghimatium bilineatum (MG722906) mitogenomes deposited in GenBank by Doğan et al. (2020) and Yang et al. (2019), respectively.