flatworm, platyhelminth
["loupe, jeweler's loupe", 'oystercatcher, oyster catcher', 'Petri dish', 'puck, hockey puck', 'bullfrog, Rana catesbeiana', 'platypus, duckbill, duckbilled platypus, duck-billed platypus, Ornithorhynchus anatinus', 'goldfish, Carassius auratus']