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Just about the thickness of a pencil, the red slate pencil urchin contains spines that are blunt and harmless, unlike the painfully sharp needle-like spines of the more common black sea urchin. In old Hawaii, natives sometimes carved the spines decoratively.
Eucidaris tribuloides, the slate pencil urchin, is a species of cidaroid sea urchins that inhabits littoral regions of the Atlantic Ocean. As a member of the basal echinoid order Cidaroida, its morphological, developmental and molecular genetic characteristics make it a phylogenetically interesting species.
The spines of the Spiny Sea Urchin may have a green iridescence, while the test (body) varies in colour from deep red to black. Habitat. Spiny Sea Urchins live on intertidal rocky shores and in coastal waters to a depth of 35 m. Distribution. The Spiny Sea Urchin is found in New South Wales, Victoria and Tasmania. Other behaviours and adaptations.
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Red Slate Pencil Sea Urchin (Heterocentrotus mammillatus) on the urchin's preference of rocky ground. Red Sea Urchins are the delight of every predator's diet. Even certain kinds of fish would eat them in a second such as the wolf eel, sea stars, and crabs.
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Sea urchins are spiny sea creatures of the class Echinoidea found in oceans all over the world. (The name sea urchin means sea hedgehog, hedgehog being one meaning of the word urchin).Their shell, which biologists call the test, is globular in shape, and covered with spines. The size of the test in adults is typically in the range of 3 to 10 cm. Typical sea urchins have spines 1-2 cm in length.