Map of the Iberian Peninsula with the distribution of the non-native parasitic anchor worm (Lernaea cyprinacea). (A) The Iberian Peninsula showing the river networks (blue lines), river basins (grey lines), drainage basins (black lines) and prevalence values (red dots). Black dots show localities without prevalence values. (B) Bibliographic source (refer to Tab. 1 for bibliographic naming conventions). The localities of the field study are marked with a red arrow (numbers: 9 and 11).