Fig. 1

Map of the Milford Haven Waterway (MHW, large image) in Wales, UK (inset). Crepidula fornicata was first recorded at Pennar in 1953 and soon after in Hazelbeach, Pwllcrochan, Lawrenny, and Beggars Reach. By 1964, it had spread between Dale and Landshipping Quay. A few individuals were found in the Skomer Marine Conservation Zone (Skomer MCZ) just outside of the MHW in 2008 and in the Menai Strait in North Wales in 2006, but there is no indication that this leads to an establishment of a population at these locations