The larval stages of several species are cultured as feeder insects for captive insectivores or as laboratory subjects: Tenebrio molitor is commonly used to feed terrestrial amniotes kept in terraria. Tribolium castaneum is a laboratory animal useful as a model organism, especially in studies of intragenomic conflict and population ecology. Zophobas morio, or superworm, is valued as a feed for captive reptiles; it contains less chitin than Tenebrio molitor. Alphitobius diaperinus, lesser mealworm[14] Many tenebrionids are pests of cereal and flour silos and other storage facilities, including T. castaneum, other Tribolium species such as Tribolium confusum and Tribolium destructor, and Gnathocerus cornutus. In southwestern North America, species of the genus Eleodes (particularly E. obscurus) are well known as "pinacate beetles" or "desert stink beetles". Several genera, such as Stenocara and Onymacris, are of interest in ecological studies of arid conditions and their associated adaptations.