Fig. 1

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The first records of H. invalida in European rivers outside the area of natural occurrence based on reference data. Abbreviation: sof references: 1Popescu-Marinescu (1992), 2Semenchenko et al. (2016), 3Ketelaars (2004), 4Dzyuban and Slobodchikov (1980), 5Ferencz (1969), 6Zorić et al. (2011), 7Lvova et al., (1996), 8Klink and Bij de Vaate (1996), 9Tittizer et al. (2000), 10Tischikov and Tischikov (2005), 11Vanden Bossche et al. (2001), 12Devin et al. (2006), 13Eggers and Anlauf (2008), 14Gallardo and Aldridge (2013), 15Wozniczka et al. (2011), 16Müller et al. (2018), 17Vučković et al. (2021).
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