Spiders are air-breathing arthropods that have eight legs and chelicerae with fangs that inject venom. They are the largest order of arachnids and rank seventh in total species diversity among all other orders of organisms.
Scientific name: Araneae
Higher classification: Arachnid
Rank: Order
Lifespan: Southern black widow: 1 – 3 years, Brown recluse spider: 1 – 2 years, Goliath birdeater: 15 – 25 years
Length: Southern black widow: 1.5 in., Brown recluse spider: 0.6 – 2 cm, Deinopis subrufa: 2.5 cm
