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An Underwater Garden |
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Sea Urchins |
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Sea Urchins are echinoderms. Rather then having arms or legs the sea urchin actually has long spines as a substitute. These spines are used primarily for camouflage, locomotion, and defensive purposes. Sea urchins feed on sea grasses, algae, and decaying organic matter. |
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Sand dollars are a group of flattened sea urchins that have very tiny spines and are adapted for life on sandy shores. Sand dollars live in warm seas. |
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You can see urchin's close relationship to the starfish by looking closely at the underside of a sea urchin "test" (the shell of a sea urchin), near the middle, where a 5-pointed star pattern can be found. |
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An urchin "test" and starfish |
