Answer :

Final answer:

Malacostraca is a class in the subphylum Crustacea with a fused head and thorax forming a cephalothorax covered by a carapace, including decapod malacostracans like crabs and shrimp.


Explanation:

Malacostraca is a class within the subphylum Crustacea characterized by having a fused head and thorax forming a cephalothorax covered by a carapace. This group includes various decapod malacostracans such as crabs, lobsters, and shrimp.


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