Multiple choice This is the class organisms such as the lobster, crab, and crayfish belong to Decapoda Diplopoda Decapliopoda Decainploda Reveal answer Fill a bubble to check yourself A Correct answer Explanation Lobsters, crabs, and crayfish belong to the order Decapoda (often taught as a class or major group in introductory biology), which is characterized by having ten legs (five pairs of thoracic appendages).