Araneae Clerck, 1757 - Spiders

Kingdom: Animalia
Class: Arachnida
Order: Araneae

Spiders (order Araneae) are air-breathing arthropods that have eight legs and chelicerae with fangs able to inject venom. They are the largest order of arachnids and rank seventh in total species diversity among all orders of organisms. Anatomically, spiders differ from other arthropods in that the usual body segments are fused into two tagmata, the cephalothorax and abdomen, and joined by a small, cylindrical pedicel. Unlike insects, spiders do not have antennae. In all except the most primitive group, the Mesothelae, spiders have the most centralized nervous systems of all arthropods, as all their ganglia are fused into one mass in the cephalothorax. Unlike most arthropods, spiders have no extensor muscles in their limbs and instead extend them by hydraulic pressure. Wikipedia

Families: Araneidae, Corinnidae, Hersiliidae, Lycosidae, Nephilidae, Oxyopidae, Pisauridae, Salticidae, Sparassidae, Tetragnathidae, Theraphosidae, Thomisidae, Uloboridae, Zodariidae