Maximum likelihood tree based on ITS2 gene (-ln likelihood = −1746.99). Ingroups: Euconulus Reinhardt, 1883 (Euconulidae), Vitrea Fitzinger, 1833 (Pristilomatidae), Oxychilus Fitzinger, 1833 (Oxychilidae), and Sinoxychilus gen. nov. (Oxychilidae). This ML tree shares the same topology with the Bayesian Inference tree. Numbers on branches indicate maximum likelihood and Bayesian posterior probabilities.