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It could be argued as per http://atschool.eduweb.co.uk/sirrobhitch.suffolk/key/animal1.htm that the seven main types are Insects, Arachnids, Crustaceans, Centipedes, Millipedes, Worms, and Molluscs (with or without shells).
It could also be argued as per http://www.kidport.com/RefLIb/science/Animals/AnimalIndexInv.htm that the seven main types are protozoa, annelids, mollusks, echinoderms, crustaceans, arachnids, and insects.
However, I think it is a flawed question. If you are a teacher, you would not want to include this in your test unless you let the class know beforehand what you expect as answers.