Abstract
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.
Highlights
Pisidium tenuilineatum (Fig. 1) is widely distributed across the western Palearctic from the Mediterranean to southern Sweden and eastwards to European part of Russia (Žadin 1952, Killeen & Seddon 2011, Welter-Schultes 2012, Vinarski & Kantor 2016)
Its distribution is scattered in many countries and because it even declines in Europe, it was listed in the IUCN Red List in the category Least Concern (Killeen & Seddon 2011)
Fine-lined pea mussel was listed as Critically Endangered in the Red List in Slovakia (Šteffek & Vavrová 2006)
Summary
Pisidium tenuilineatum (Fig. 1) is widely distributed across the western Palearctic from the Mediterranean to southern Sweden and eastwards to European part of Russia (Žadin 1952, Killeen & Seddon 2011, Welter-Schultes 2012, Vinarski & Kantor 2016). Its distribution is scattered in many countries and because it even declines in Europe, it was listed in the IUCN Red List in the category Least Concern (Killeen & Seddon 2011). Fine-lined pea mussel was listed as Critically Endangered in the Red List in Slovakia (Šteffek & Vavrová 2006). This species was recorded in Slovakia for the first time in 1955 from a karstic pond and small rivulet near the town of Košice (Ložek 1956, 48°45'12.5"N, 21°12'56.2"E). 48°34'12.2"N, 21°29'38.6"E) and from underground brooks near the Silica Plateau (Gulička 1975, 48°34'13.6"N, 20°29'44.2"E) (Fig. 2) Except the latter one, all these historical data were summarized in Lisický (1991). More data about the species occurrence in Slovakia have been obtained and are summarized in this paper
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