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.
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.
Sphaerechinus granularis