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Piran's crab

Piran's crab by Steph House

St Piran’s hermit crab

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This stunning hermit crab has only returned to our southern shores in recent years. Let us hope it stays for good this time!

Enw gwyddonol

Clibanarius erythropus

Pryd i'w gweld

April - October.

Top facts

Stats

Up to 3cm long.
Rare in the UK.

Ynghylch

This species has only relatively recently made a comeback to the UK after disappearing from our shore in the late 1980s. St Piran’s will often use a variety of empty sea snail shells to make their home, including flat periwinkle, dog whelk and sting winkle. They are much shyer than the common hermit crab and will often hunker down inside their shell until all danger has disappeared.

What to look for

Red eye stalks with striking black and white eyes. Claws are equally sized, unlike other hermit crabs, with black tips. Claws and legs have blotches of red and electric blue.

Where to find

Warm water species, currently only recorded on the south west coast of England, more common further south and in Europe.

Roeddech chi yn gwybod?

In 2016, BBC Springwatch ran a competition to give this species a common name, with the chosen winning name being ‘St Piran’ - the Patron Saint of Cornwall, who was a hermit and who survived being thrown into the sea!