Spiders are invertebrate animals that produce silk, have
eight legs and no wings. More precisely, a spider is any
member of the arachnid order Araneae, an order divided
into three sub-orders in newer systems: the Mygalomorphae
(the primitive spiders), the Araneomorphae (the modern
spiders) and the Mesothelae, which contains the Family
Liphistiidae, rarely seen burrowing spiders from Asia.
The study of spiders is known as arachnology, although
it is often grouped under the more general area of entomology.
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