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.
Learn more about Malacostraca here:
https://brainly.com/question/27323383