What are the external features of a prawn and its commensal or parasitic associates Sacculina and Hermit crab?

Prawn: carapace, hepatic spine, antennal spine, antennule, antenna, maxillipede, chelate and non-chelate legs, telson, uropod, abdominal terga or pleura.
Sacculina (parasite): abdomen of crab, peduncle of parasite, legs of crab, branchial region.
Hermit crab (commensal): shell, crab, sea anemone