Sue Daly / Slipper limpet (Crepidula fornicata) invasive species, Jersey, British Channel Islands, June 2015

Solvin Zankl / Slipper snail (Crepidula dilatata) seastar (Diplodontias sp) Comau Fjord, Patagonia, Chile Pacific Ocean

Adrian Davies / Slipper Limpet (Crepidula fornicata) shells on beach. Whitstable, Kent, England, UK, August.

Fred Bavendam / Horseshoe Crab (Limulus polyphemus) with American Slipper Limpet (Crepidula fornicata) clinging to its shell, Cape May, New Jersey

Joel Sartore / Photo Ark / Group of Slipper shells (Crepidula fornicata) latched onto a discarded bottle, Gulf of Mexico at Gulf Specimen Marine Lab and Aquarium, Florida. Captive.

Joel Sartore / Photo Ark / Spiny slipper limpet (Bostrycapulus aculeatus) portrait, Gulf Specimen Marine Lab and Aquarium.

Joel Sartore / Photo Ark / Group of Eastern white slippersnails (Crepidula plana) inside shell of Lightning whelk (Busycon contrarium), Gulf Specimen Marine Lab and Aquarium.

Joel Sartore / Photo Ark / Group of Eastern white slippersnails (Crepidula plana) inside shell of Lightning whelk (Busycon contrarium), Gulf Specimen Marine Lab and Aquarium.

Joel Sartore / Photo Ark / Spiny slipper limpet (Bostrycapulus aculeatus) portrait, Gulf Specimen Marine Lab and Aquarium.

Joel Sartore / Photo Ark / Spiny slipper limpet (Bostrycapulus aculeatus) portrait, Gulf Specimen Marine Lab and Aquarium.

Adrian Davies / Slipper limpet (Crepidula fornicata) shells on shingle, Dungeness, Kent, UK. June.

Mick Jenner / Turnstone (Arenaria interpres) feeding on a washed up Slipper limpet (Crepidula fornicata), West Sussex, England, UK, November.