flatworm, platyhelminth
['horned viper, cerastes, sand viper, horned asp, Cerastes cornutus', 'amphibian, amphibious vehicle', 'harvestman, daddy longlegs, Phalangium opilio', 'leaf beetle, chrysomelid', 'submarine, pigboat, sub, U-boat', 'acorn squash', 'nail']