Green Sea-urchin

Psammechinus miliaris

  1. Wildlife
  2. Urchins and starfish
  3. Green Sea-urchin


The Green Sea-urchin is a small, round sea-urchin with strong, short spines. Lives amongst seaweed and rocks, grazing on sponges, seaweed and other algae, and also eats young shellfish.

How to identify

There are several similar sized sea urchins found in British waters. The Green Sea-urchin is slightly flattened in shape and greenish in colour, with purple tips to the spines.

Where to find it

Found on rocks shores all round our coasts, much more common in the north of the UK.


When to find it

  • January
  • February
  • March
  • April
  • May
  • June
  • July
  • August
  • September
  • October
  • November
  • December

How can people help

Sea-urchins and starfish provide a vital link in the food chain for many of our rarer species. Our seas and coastline are in need of protection if we are to keep our marine wildlife healthy. The Wildlife Trusts are working with fishermen, researchers, politicians and local people towards a vision of 'Living Seas', where marine wildlife thrives. This work has recently had a massive boost with the passing of the Marine Bill, promising sustainable development of the UK's marine environment. Do your bit for our Living Seas by supporting your local Wildlife Trust.

Species information

Common name
Green Sea-urchin
Latin name
Psammechinus miliaris
Urchins and starfish
Diameter: 5cm Average Lifespan: 10 years
Conservation status