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For Insects, Spiders & Their Kin
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Class Arachnida - Arachnids

serious little predator (spider) - Oecobius Unknown Spider - Just Plain Cool Goldenrod Crab Spider - Misumena vatia - male - female Jumping Spider? - Tutelina Cross Orbweaver - Araneus diadematus Adult Male - Tibellus oblongus - male Small Jumping Spider - Sitticus concolor - male Crab Spider - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Numbers
Worldwide: (1)
12 orders
450 families
75,500 species

Orders:
Amblypygi - Tailless Whipscorpions
Araneae - Spiders
Uropygi - Whipscorpions
Opiliones - Harvestmen
Pseudoscorpiones - Pseudoscorpions
Schizomida - Short-tailed Whipscorpions
Scorpiones - Scorpions
Solifugae - Windscorpions
Subclass Acari - Mites and Ticks
-Superorder Parasitiformes
Ixodida - Ticks
-Superorder Acariformes
Identification
One or two body parts
Four pairs of legs (usually - although immature ticks, for example, can have three pairs of legs)
No antennae
Internet References
Common Names of Arachnids 2003 Fifth Edition - The American Arachnological Society; Committee on Common Names of Arachnids
Works Cited
1.Animal: The Definitive Visual Guide to the World's Wildlife
Don E. Wilson, David Burnie. 2001. Dorling Kindersley Publishing.