Friday, September 17, 2004


Any member of the class Arachnida, part of the invertebrate phylum Arthropoda. Arachnida includes forms such as spiders (Araneida), harvestmen (daddy longlegs; Opiliones), scorpions (Scorpionida), and mites and ticks (Acari), as well as lesser-known groups. Only a few species are of economic importance, including the acarids that transmit diseases to humans, other animals,


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