Lobsters are invertebrate crustaceans. They have hard outer shells (called an exoskeleton), but no inner bones. Although lobsters have eight legs for walking (the front 3 pairs have claws and the first pair are larger than the others).
Because the front pincers are also biologically considered legs, lobsters are considered to have 10 legs. Lobsters are also referred to as decapods (“deca” being Greek for ten and “pods” for feet).