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This contribution describes two new sites of the depressed river mussel Pseudanodonta complanata (Rossmässler) in the Carpathian Mts. Empty but well preserved shells were found at two sites in the Wisłok River (Krosno and Odrzykoń). These are the second records of the species from the Polish part of the Carpathians. As only empty shells were found, it is unclear whether the species is a constant component of the river fauna of the Carpathians in Poland. key words: Pseudanodonta complanata, Unionidae, Carpathians The depressed river mussel Pseudanodonta complanata (Rossmässler, 1835) is a large unionid. It can be confused with some other members of the family, especially with Anodonta anatina (Linnaeus, 1758). The rhomboid-shaped shell is distinctly laterally flattened (hence the species’ name). The colouration is usually greenish-brown. The umbo has a spiny relief unlike the similar species of Anodonta occurring in Poland (Piechocki & wawrzyniak-wydrowska 2016). The depressed river mussel is in general a riverine species (wolff 1968), preferring large rivers (Piechocki & wawrzyniak-wydrowska 2016), however it is also known from stagnant waters such as postglacial lakes (StańczykowSka et al. 1983), oxbow lakes (jakuBik & lewandowski 2013) and dam reservoirs (jurkiewicz-karnkowska 1989). In Poland it is regarded as a lowland species, and only one submontane record from the Carpathians is known from the Dunajec River near Rożnów Reservoir (zając 2004, zając k. pers. comm.). Other localities include the Wielkopolska region (koralewska-Batura et al. 2010), Masurian Lakeland (Krutynia River; jakuBik & lewandowski 2011, lewandowski & jakuBik 2014), middle and lower Odra River (zając 2004). As in other unionids, the larvae are parasites of fish including common species such as Gymnocephalus cernua (Linnaeus, 1758), Perca fluvia tilis (Linnaeus, 1758), Pungitius pungitius (Linnaeus, 1758), Gasterosteus aculeatus (Linnaeus, 1758) and Salmo trutta fario (Linnaeus, 1758) (Berrie & Boize 1985, Mcivor & aldridge 2007, Piechocki & wawrzyniak-wydrowska 2016 and papers cited therein). The depressed river mussel is generally widespread across European countries. Its range includes Germany, the United Kingdom, Sweden, Finland, Austria, Switzerland, France and the Netherlands (haas 1969, Mcivor & aldridge 2007, loPes-liMa et al. 2017). Despite its relatively wide range, the species is usually rare (declining in Europe; IUCN 2018) and is listed as Vulnerable (VU) in the IUCN Red List (IUCN 2018). In Poland it is evenly distributed across the lowlands, however many of the records are considered historical and the most recent sites are aggregated in relatively small areas, suggesting a highly fragmented (meta)population within the country (zając 2004). The depressed river mussel is also considered the rarest unionid species in Poland (Piechocki &

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A new locality of the depressed river mussel Pseudanodonta complanata (Rossmässler, 1835) (Bivalvia: Unionidae) in the Wisłok River (Carpathian Mountains)