A great diversity in shell morphology with extremely homogenous anatomical traits created a great confusion regarding the systematics of lymnaeids especially those belonging to the genus Radix. Some authors [25] considered R. peregra (Müller, 1774) as a synomym of R.
ovata (Draparnaud, 1805) and R. balthica (Linnaeus, 1758), while others maintained all species as valid [44].