ARTHROPOD OR MOLLUSC? 4Online version Is this an arthropod or a mollusc? by Rafael Rodríguez Pérez 1 It has got a soft body. Hints 1 These animals can have got shells. 2 But this animal hasn't got a shell. 3 It's invertebrate. 4 It can swim. 5 Come on, it's a piece of cake! Is it an arthropod or a mollusc? 6 It lives in the sea. 7 Arthropod or mollusc?