flatworm, platyhelminth
['nail', 'ant, emmet, pismire', 'sandal', 'American lobster, Northern lobster, Maine lobster, Homarus americanus', 'gar, garfish, garpike, billfish, Lepisosteus osseus', 'bullfrog, Rana catesbeiana', 'echidna, spiny anteater, anteater']