The Opiliones are an order of arachnids colloquially known as harvestmen, harvesters, or daddy longlegs. As of April 2017, 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.
Cosmetidae is a family of harvestmen in the suborder Laniatores. With over 700 species, it is one of the largest families in Opiliones. They are distributed from Argentina to the southern USA with the highest diversity in northern South America, Central America and Mexico. This Nearctic-Neotropical family comprises Opiliones with elaborate white/yellow/green/orange/red stripes and spots on the dorsal scutum and peculiar pedipalps strongly compressed and applied on the chelicerae.
Ischyropsalididae is a family of harvestmen with 31 described species in 3 genera, found in Europe and North America.
The Stygnopsidae are a small family of harvestmen, with almost all species found in Mexico.
Agoristenidae are a neotropical harvestman family of the Suborder Laniatores, in the superfamily Gonyleptoidea.
The Cranaidae are a family of neotropical harvestmen within the suborder Laniatores.
The Icaleptidae are a small family of neotropical harvestmen within the suborder Laniatores. Although only two species have been described, many more are probably to be discovered.
Escadabiidae is a small neotropical family of the harvestman infraorder Grassatores with six described species.
Kimulidae is a small neotropical family of the harvestman infraorder Grassatores with about thirty 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.
Podoctidae is a family of the harvestman infraorder Grassatores with about 130 described species.
The Cladonychiidae are a small family of harvestman with about 33 described species, within the suborder Laniatores.
Yania is a genus of harvestmen from South America.
Theromaster brunneus is a species of armoured harvestman in the family Travuniidae. It is found in North America.
Siro exilis is a species of mite harvestman in the family Sironidae. It is found in North America.
Cryptomastridae is a family of armoured harvestmen in the order Opiliones. There are two genera and four described species in Cryptomastridae, found in Oregon and Idaho.
Peltonychia is a genus of armoured harvestmen in the family Cladonychiidae. There are about nine described species in Peltonychia, found in Europe.
Taito is a genus of harvestmen in the family Cosmetidae. The genus is endemic to the Amazon Basin in Brazil, Colombia, Ecuador and Peru.
