Pencil urchin.

Pencil Urchin

The pencil urchin is a species of sea urchin from the Atlantic ocean.

Slate pencil urchin.

Pencil urchin (Eucidaris tribuloides).

This picture was not taken in the ocean but in a pet store in Toronto. The urchin is real but the plants in the background are fake.

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Last updated: October 17, 2014

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