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Urchins
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The Sputnik Pencil Urchin or Mine Urchin ( Eucidaris tribuloides ) has thick, blunt spines that are sparsely arranged over its rigid body and often resemble the Sputnik satellite.
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Lytechinus variegatus is referred to most often as either the Variegated Urchin or Pin Cushion Urchin. They are variable in color and are usually light green or tan but
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The Slate Pencil Urchin ( Heterocentrotus mammillatus ) has thick, blunt spines that not only look like pencils but were at one time used as such. The spines can
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Collector Urchins ( Tripneustes gratilla , also called Sea Eggs) live up to their name, sweeping over substate and reef and collecting bits of whatever they encounter to use as
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![Lytechinus variegatus Pink Pin Cushion Urchin - Medium]()
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Lytechinus variegatus is referred to most often as either the Variegated Urchin or Pin Cushion Urchin. They are variable in color and are usually light green or tan but
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Sand Dollars are pancake-shaped sand dwellers, and need large areas of fine substrate in which to burrow. They are types of Sea urchins, and are densely covered in fine,
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These urchins have magnificent coloration, but they can deliver a powerfully painful and venomous sting. This urchin is also known as the Radiating Hatpin Urchin, and the spines are
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![Echinometra viridis Impact Urchin]()
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The Impact Urchin ( Echinometra viridis ) and the Rock Boring Urchin ( Echinometra lucunter ) are two very similar urchins both found around the Caribbean and western Atlantic
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The Slate Pencil Urchin ( Heterocentrotus mammillatus ) has thick, blunt spines that not only look like pencils but were at one time used as such. The spines can
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Collector Urchins ( Tripneustes gratilla , also called Sea Eggs) live up to their name, sweeping over substate and reef and collecting bits of whatever they encounter to use as
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The Black Longspine Urchin ( Diadema setosum ) is popular and has a very well-known appearance. It has long, thin black spines that extend from its body, and five
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Lytechinus variegatus is referred to most often as either the Variegated Urchin or Pin Cushion Urchin. They are variable in color and are usually light green or tan but
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