New records of Pisidium tenuilineatum Stelfox, 1918 (Bivalvia, Sphaeriidae) from Slovakia

So far, Pisidium tenuilineatum has been reported from Slovakia only from four sites. Six new sites of this pea mussel have been found during the last twenty years in Slovakia in both small karstic watercourses (e.g. rivulets, brooks and small rivers) and large lowland rivers. These new records show that P. tenuilineatum should be still considered as a rare species in Slovakia but some new populations are still likely to be discovered especially in lower elevations and in the areas of low anthropogenic influence.