Crustaceans have bilateral symmetry. They all have five pairs of legs and most have at least one pair of claws and have a hard outer shell. The crustacean grows out of it's shell, the shell does not grow; this is called molting. If a leg is lost, it will be regenerated. Echinoderms have spiky skin and an endoskeleton (skeleton on the inside of its body). All echinoderms have radial symmetry, meaning it has more than two lines of symmetry. Both echinoderms and crustaceans regenerate limbs. Crabs, shrimp, and lobsters are all crustaceans. Sea stars, sea cucumbers, and sea urchins are all echinoderms.
Crustaceans:
Blue Lobster (Panulirus versicolor)
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| Hermit Crab (Paguristes cadenati) |
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| Cleaner Shrimp (Lysmata amboinensis) |
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| My favorite crustacean, Peacock Mantis Shrimp! |
Echinoderms:
Eleven-armed Sea Star (Coscinasterias muricata)
Water Melon sea urchin (Echinus melo)
Conspicuous Sea Cucumber (Synapta maculata)
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