How do you clarify arthropoda?

Likely the intent is "classify" (to clarify is to make clear, or to explain). Arthropda fall under Metazoa (Animalia); Eumetazoa; Bilateria; Protostomia; Ecdysozoa; Panarthropoda. Arthropods are characterized by segmented bodies, an exoskeleton made from chitin, and joint appendages.