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Insects and their near relatives
With info about the arachnid orders. A manual for the study of insects by John Henry Comstock & Anna Botsford Comstock. University of Massachusetts (USA)
Subphylum Chelicerata
Info and pictures. Bill Tietjen. Bellarmine College Department of Biology (USA)
Arachnida
Short info about the different arachnid orders. Wikipedia, in many languages
El maravilloso mundo de los Ar&aacite;cnidos
The wonderful world of arachnids. Much information and pictures. Anita Hoffmann. Instituto Latinoamericano de la Comunicacion Educativa (in Spanish) (Mexico)
Generalidades y tiposde Arácnidos
Information and pictures. Anita Hoffmann. Instituto Latinoamericano de la Comunicacion Educativa (in Spanish) (Mexico)
Entre Vinagrillos y Tendarapos
Uropygi and Amblypygi. Info and drawings. Anita Hoffmann. Instituto Latinoamericano de la Comunicacion Educativa (in Spanish) (Mexico)
Illustrated Key to the Orders of Arachnida
Pictures showing the difference between the arachnid orders from the Great Smoky Mountains National Park. Discover life in America (USA)
Insects Explained
Info and pictures of the arachnids orders and other arthropods. Lucinda Treadwell. Department of Entomology and Nematology, University of Florida (USA)
Spider classification
The difference between arachnids and other invertebrates, mygalomorpha and araneomorpha spiders. Biodiversity Explorer Spotlight, iziko, museums of Cape Town (South Africa)
Arachnida Ngiana
The arachnid orders. Info and pictures. Acta Scientrium Ngensis (in Chinese) (China)