[1] S. granularis is a large sea urchin, somewhat flattened dorsally and growing to fifteen centimetres in diameter.

[3] S. granularis is found in the Mediterranean Sea and the eastern Atlantic Ocean, from the Channel Islands south to Cape Verde and the Gulf of Guinea.

[5] S. granularis often covers itself with morsels of algae and shell fragments, which are held in place by the tube feet and by the claw-like structures known as pedicellaria.

[7] Spawning takes place at any time of year but the peak period is spring and early summer.

In Tunisia, S. granularis is found living in association with two other species of sea urchins, Centrostephanus longispinus and Paracentrotus lividus.