• Describe the characteristics of crustaceans.
• Compare aquatic crustaceans with terrestrial crustaceans.
• Explain the functions of the appendages on a crayfish.
• Summarize digestion, respiration, circulation, excretion, and neural control in crayfish.
vocabulary nauplius cirrus isopod decapod cephalothorax thorax carapace abdomen antenna antennule cheliped swimmeret telson uropod digestive gland green gland
Th e subphylum Crustacea contains about38,000 known species. Crustaceans are abundant in oceans, lakes, and rivers, and a few species live on land. Some crustaceans are sessile, while others move by walking on legs, swimming with paddle-like appendages, or drifting with the currents.
The free-swimming nauplius is an early stage in the development of most crustaceans. It has one eye and three pairs of appendages.
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