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Violet Sea Urchin Video Stock Footage

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. 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 fertilisation takes place. The larvae are planktonic. After several moults, the echinopluteus larva settles and undergoes metamorphosis before developing into a juvenile.

Learn more about Violet Sea Urchin

Animalia: Echinodermata: Camarodonta: Echinoidea: Toxopneustidae: Sphaerechinus granularis

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