Bratislavia dadayi (Michaelsen, 1905) (Annelida: Clitellata: Naididae):A new non-indigenous species for Europe, and other non-native annelids in the Schelde estuary

For the first time, the freshwater oligochaete species Bratislavia dadayi (Michaelsen, 1905) is recorded in Europe. The species was found at three subtidal stations in the Schelde estuary in Belgium, where it was probably introduced from the Americas. We provide an overview of the species' nomenclature, diagnostics, distribution, and ecology. Bratislavia dadayi is one of 11 non-indigenous annelids currently known to occur in the Schelde estuary.