- Kingdom: Animalia
- Phylum: Echinodermata
- Subphylum: Asterozoa
- Class: Asteroidea
- Order: Forcipulatida
- Family: Asteriidae
- Scientific name: Marthasterias glacialis
- Norwegian: piggsjøstjerne
This is our largest starfish, reaching a diameter of impressing 70 cm. The central disk is relatively small. On the tip of each arm approximately eight purple spines produce a flower like formation. The arms are covered by large, white spines. Each spine is surrounded by a white cushion. and the longitudinal rows of spines and cushions form a very distinct profile. The coloration varies from pale brown to yellow or orange.
It thrives on all kind of substrates, from the subtidal zone and down to 200 meters.
The spine starfish is registered widespread over the Atlantic Ocean, on both hemispheres.