Last updated: 20/01/2017 [Design & Pictures by Simons Nature]
Arachnida

Arachnida [Arachnids]

Arachnids are a class (Arachnida) of joint-legged invertebrate animals (arthropods), in the subphylum Chelicerata. All arachnids have eight legs, although the front pair of legs in some species has converted to a sensory function, while in other species, different appendages can grow large enough to take on the appearance of extra pairs of legs. The term is derived from the Greek word ἀράχνη (aráchnē), meaning "spider". Spiders are the largest order in the class.
Amblypygi is an ancient order of arachnid chelicerate arthropods also known as whip spiders and tailless whip scorpions (not to be confused with whip scorpions and vinegaroons that belong to the related order Thelyphonida). The name "amblypygid" means "blunt rump", a reference to a lack of the flagellum ("tail") that is otherwise seen in whip scorpions. They are harmless to humans.
Spiders (order Araneae) are air-breathing arthropods that have eight legs and chelicerae with fangs that inject venom. They are the largest order of arachnids and rank seventh in total species diversity among all other orders of organisms. Spiders are found worldwide on every continent except for Antarctica, and have become established in nearly every habitat with the exceptions of air and sea colonization. As of November 2015, at least 45,700 spider species, and 113 families have been recorded by taxonomists.
The Opiliones (/ˈoʊpɪliːˈoʊniːs/; formerly Phalangida) are an order of arachnids colloquially known as harvestmen, harvesters or daddy longlegs. Although both harvestmen and spiders are arachnids, the two orders are not otherwise closely related. As of December 2011, over 6,500 species of harvestmen have been discovered worldwide, although the total number of extant species may exceed 10,000.
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