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Slipper Limpet

Slipper Limpet ©Paul Naylor

Slipper limpet

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These non-native limpets arrived from America in the 19th century and are now widespread in the UK. They form stacks and have a specially adapted shell which, when flipped upside down, looks like a slipper!

Scientific name

Crepidula fornicata

When to see

January to December

Top facts

Stats

Length: 5cm
Common, but a non-native species.

Habitats

About

The slipper limpet normally lives in stacks of up to 12 individuals, with the largest at the bottom and increasingly smaller animals on each other's backs. They live on the seabed out beyond the low tide mark, but empty shells can often be found washed up on beaches. Accidentally introduced from North America in a shipment of oysters, it is now a serious pest of oyster and mussel beds.

What to look for

Unmistakeable, slipper-shaped, oval shell. Normally pale creamy in colour with blotches of orangey-red.

Where to find

Found around the coasts Southern England and Wales as far north as Anglesey on the west coast and Spurn Point on the east coast.

Did you know?

At the base of the stack, the largest and oldest slipper limpets are female, with the younger and smaller males on top. However, if the females die, the largest male will turn into a female.