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
hand-schuller-christian disease: inflammatory histiocytosis associated with disturbance of cholesterol metabolism; occurs chiefly in young children and is characterized by cystic defects of the skull and diabetes insipidus