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The Mygalomorphae are spiders whose chelicerae move in vertical planes perpendicular to the surface on which they stand so that when biting prey or defending against attack the tips of their fangs move vertically. They have four book lungs. (Other spiders generally have two book lungs.) This suborder contains several families including the Theraphosidae (spiders that are sometimes called tarantulas or bird spiders), Barychelidae (trap door spiders), Ctenizidae (another kind of trap door spider), Dipluridae (funnelweb spiders), and Atypidae (purseweb spiders).