WEBApr 1, 2006 · Langostinos are in the same order, Decapoda, and suborder, Pleocyemata, as American and spiny lobsters but different infraorders. American lobsters are in the Astacidea infraorder, while spiny lobsters are in the Palinura infraorder. Langostinos are in the Anomura infraorder, with and hermit and porcelain crabs, and in the Galatheidae family.