stonefly: primitive winged insect with a flattened body; used as bait by fishermen; aquatic gilled larvae are carnivorous and live beneath stones
arthropod: invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin
russian roulette: a stunt in which you spin the cylinder of a revolver that is loaded with only one bullet and then point the muzzle at your head and pull the trigger