Phylogenetic tree based on a combined dataset of 18S and ITS-1 rDNA sequences of molluscs with a total of 1338 nucleotide sites constructed using the Maximum Likelihood method and the general time reversible model (GTR +1). The tree has been rooted using Succinea putris (HQ659993.1). I - Buliminidae, II - Hygromiidae; III - Parmacellidae; IV - Agriolimacidae.