S. granularis is a large sea urchin, somewhat flattened dorsally and growing to fifteen centimetres in diameter. There are two distinct colour forms. The test is purple in both but one has purple spines and the other white. The spines are short and blunt, all the same length, and arranged neatly in rows.[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. It favours sheltered locations and lives on rocks covered with seaweed or gravelly substrates. It is usually found in the neritic zone down to about 30 metres (100 ft),[3] but it is occasionally as 130 metres (430 ft).[4] It is also found in meadows of the seagrassPosidonia oceanica.[5]
Biology
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.[6] It grazes on algae, especially encrusting coralline algae, seagrass blades and their epiphytic organisms and detritus.[7]
Spawning takes place at any time of year but the peak period is spring and early summer. Eggs and sperm are liberated into the water column, where egg fertilisation takes place. The larvae are planktonic. After several moults, the echinopluteus larva settles and undergoes metamorphosis before developing into a juvenile.
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