UK Seas

Discover the wonderful sea creatures that inhabit the UK seas and shores

Know the name of the creature you are looking for?

UK seas is a guide to the fauna and flora found around UK coasts. While the majority of species are marine, some species are included that are regularly encountered on land by the coast, so you’ll find descriptions of non-marine species such as reptiles, amphibians, insects and plants as well.

Spiny spider crab

Maia squinado


Crustaceans, Crabs


A knobbly, large but slender crab with long jointed legs. It is often covered with sponges and seaweed and so is difficult to spot.

These crabs sometimes come together to form huge crowds of individuals, staying in one place for many weeks at a time while they moult and mate.


This species is common, especially in the South and West, sometimes found in lower shore pools.

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