(A) Potential current distribution of yellow sac spiders in Europe, based on only native European populations as well as populations with unknown status. (B). Potential current distribution of yellow sac spiders in Europe, based on all currently known occurrences of expanding populations, as well as populations with unknown status. (C, D) Estimated hypervolumes based on a bandwidth approach (BWD) and multivariate minimum convex polygons (MMCP). For high‐resolution versions of the biplots, see Supplementary Material S4.