The Opiliones are an order of arachnids, colloquially known as harvestmen, harvesters, harvest spiders, or daddy longlegs. As of July 2024, over 6,650 species of harvestmen have been discovered worldwide, although the total number of extant species may exceed 10,000. The order Opiliones includes five suborders: Cyphophthalmi, Eupnoi, Dyspnoi, Laniatores, and Tetrophthalmi, which were named in 2014.
The Eupnoi are a suborder of harvestmen, with more than 200 genera, and about 1,700 described species.
The Triaenonychidae are a family of harvestmen with about 120 genera and more than 440 described species.
Caddoidea superfamily of harvestmen arachnids with a single family Caddidae, which now only contains 2 extant species. The family previously contained many more taxa under a previous wider concept, but the familial definition was narrowed after restudy.
The Pettalidae are a family of harvestmen with 75 described species in 10 genera. Several undescribed species are known or assumed in some genera.
Eotrogulus is an extinct genus of harvestmen known from the Carboniferous fossil record. The genus is the only member of the family Eotrogulidae and contains one species Eotrogulus fayoli. Eotrogulus was found in the Coal Measures of Commentry in northern France, together with Nemastomoides elaveris. Eotrogulus was previously thought to be a trigonotarbid.
Assamiidae are a family of harvestmen with more than 400 described species. It is the third most diverse family of the suborder Laniatores.
The Stygnidae are a family of neotropical harvestmen within the suborder Laniatores.
The Cranaidae are a family of neotropical harvestmen within the suborder Laniatores.
Escadabiidae is a small neotropical family of the harvestman infraorder Grassatores with six described species.
Samoidae is a family of the harvestman infraorder Grassatores with about fifty described species.
Biantidae is a family of the harvestman infraorder Grassatores with about 130 described species.
The Fissiphalliidae are a small monotypic neotropical family of harvestmen within the suborder Laniatores, superfamily Zalmoxoidea. It contains only the single genus FissiphalliusMartens, 1988 with seven described species. All species are found in the South America.
The Synthetonychiidae are a small family of harvestman with a handful of species in a single genus. They are endemic to New Zealand.
Dalquestia is a genus of harvestmen in the family Globipedidae with six described species. All species are found in North America.
Pantopsalis cheliferoides is a species of Neopilionid harvestmen. This species was originally described by William Colenso and is endemic to New Zealand.
Pantopsalis albipalpis is a species of harvestman in the genus Pantopsalis. It was first described by Reginald Innes Pocock in a paper published in 1902. P. albipalpis cannot be distinguished from P. johnsi but P. johnsi has not been synonymised as these species each have a distinct distribution.
Pantopsalis listeri is a species of harvestman in the family Neopilionidae.
The harvestman family Globipedidae is a small lineage comprising 6 genera and some 33 species. They occur in various parts of North America and Central America. They were formerly included as a subfamily of Sclerosomatidae.
Rakaia is a genus of harvestmen in the family Pettalidae with eighteen described species. All species are found in New Zealand.
