Starfish
Spiny Starfish
Marthasterias glacialis
How to spot it
Big and unmistakable: five long tapering arms lined with three rows of white spines, each spine ringed with blue at its base. Pale grey-green, on rocky shores; large ones can span a forearm.
Usually seen at
8-40 m (median 18 m)
Size
Large (over 50 cm)
Habitat
Rocky crevice, Sandy bottom
Behaviour
On bottom
Where it's seen
Occurrence records around the UK and north-east Atlantic (OBIS).