Arachnid

Orders

• Amblypygi - "Blunt rump" tailless whip scorpions with front legs modified into whip-like sensory structures as long as 25 cm or more
• Araneae - Spiders (40,000 species)
• Opiliones - Phalangids, harvestmen or daddy longlegs (4,500 species)
• Palpigradi - Microwhip scorpions
• Pseudoscorpionida - Pseudoscorpions
• Ricinulei - Ricinuleids, Hooded tickspiders
• Schizomida - "Split middle" whip scorpions with divided exoskeletons
• Scorpiones - Scorpions (2,000 species)
• Solifugae - Solipugids; windscorpions, sun spiders or camel spiders (900 species)
• Uropygi - whip scorpions, with first legs modified as whip-like sensory organs and with a long thin tail at end of abdomen (60 species)
• Acarina - Mites and ticks (30,000 species)
• Acariformes
• Sarcoptiformes
• Trombidiformes
• Opilioacariformes
• Parasitiformes - Holothyrans, ticks and mesostigmatic mites

Also see the following articles for links to species by common name:

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• List of scorpion common names
• List of spider common names
• List of false scorpions