Animals with chitinous exoskeletons and jointed appendages are classified as

Animals with chitinous exoskeletons and jointed appendages are classified as Arthropods.

Arthropods are invertebrates which have an exoskeleton (external skeleton) enveloped with cuticle of chitin, a segmented body, and paired jointed appendages (each segment contains a pair of appendages). The cuticle is a rigid structure (usually mineralised with calcium carbonate), so those animals must replace it periodically by moulting. Arthropods include insects, arachnids, myriapods, and crustaceans.