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Crustaceans Crustacean, common name for any of a group of mainly aquatic arthropod invertebrates, including the crab, lobster, and shrimp. Crustaceans are also successful in fresh water, and a few, such as sow bugs, are common in moist land environments. Although most crustaceans are small, they vary widely in form and include such large members as lobsters up to 60 cm (24 in) long and a spider crab with a leg span of 3.6 m (12 ft). The subphylum …

…hearing, they basically react to vibration more than sound, cuz that's how they hear. ******Interesting Facts******** Largest crustacean was the Giant Spider Crab which was 12 feet and 1.8 inches. it weighed 41 pnds and it was found in Japan Smallest Crustacean was the pea crab, it was about .25 inches across the shell. Heaviest Crustacean was the Lobster which weight 42 pounds 7 ounces. It was caught in 1934 and the nickname was "Mike" Type of lobster- Atlantic Lobster. ------------------------------------------------------------------------ **Bibliography**