The Spiny Sea Urchin has long, needle-like spines, which it wedges in cracks and crevices to secure itself to rocks.
The spines of the Spiny Sea Urchin may have a green iridescence, while the test (body) varies in colour from deep red to black.
Spiny Sea Urchins live on intertidal rocky shores and in coastal waters to a depth of 35 m.
The Spiny Sea Urchin is found in New South Wales, Victoria and Tasmania.
Other behaviours and adaptations
This species has been linked to changes in abalone populations. The Spiny Sea Urchin is usually found in large numbers and affects the ecology of the reef by clearing areas of kelp, causing barren areas known as white rock.