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Opiliones
Harvestmen
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Harvestmen are arachnids belonging to the order Opiliones (formerly Phalangida). As of 2006[update], over 6,400 species of harvestmen have been discovered worldwide, although the real number of extant species may exceed 10,000.[1] The order Opiliones can be divided into four suborders: Cyphophthalmi, Eupnoi, Dyspnoi and Laniatores. Well-preserved fossils have been found in the 400-million year old Rhynie cherts of Scotland, which look surprisingly modern, indicating that the basic structure of the harvestmen has not changed much since then. Phylogenetic position is disputed: their closest relatives may be the mites (Acari) or the Novogenuata (the Scorpiones, Pseudoscorpiones and Solifugae).[2]

Although they belong to the class of arachnids, harvestmen are not spiders, which are of the order Araneae rather than the order Opiliones.

In some places, harvestmen are known by the name "daddy longlegs" or "granddaddy longlegs", but this name is also used for two other unrelated arthropods: the crane fly (Tipulidae) and the cellar spider (Pholcidae).

Opiliones :
Cyphophthalmi
Eupnoi
Dyspnoi
Laniatores

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Opiliones
Harvestmen
Arachnida
Arachnida
Arachnids
Chelicerata
Arthropoda
Jointed Feet
Ecdysozoa
Molting
Protostomia
Mouth First
Bilateria
Two-Way Symmetry
Eumetazoa
True Higher Animals
Animalia
Animals
Eukaryota
Eukaryota
Cells with a Nucleus

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