flatworm, platyhelminth
['walking stick, walkingstick, stick insect', 'harvestman, daddy longlegs, Phalangium opilio', 'horned viper, cerastes, sand viper, horned asp, Cerastes cornutus', 'hammerhead, hammerhead shark', 'scuba diver', "plunger, plumber's helper", 'ant, emmet, pismire']