The Opiliones are an order of arachnids colloquially known as harvestmen, harvesters, harvest spiders, 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.
Laniatores is the largest suborder of the arachnid order Opiliones with over 4,000 described species worldwide. The majority of the species are highly dependent on humid environments and usually correlated with tropical and temperate forest habitats.
Samooidea is a large superfamily in the Grassatores group of harvestmen. It includes around 380 species distributed throughout the tropics. They are characterized by the complex male genitalia, with eversible complementary sclerites.
The Sclerosomatidae are a family of harvestmen with about 1,300 known species. One former subfamily has been recently removed to form a new family, Globipedidae.
Ischyropsalididae is a family of harvestmen with 31 described species in 3 genera, found in Europe and North America.
Epedanidae is a family of the harvestman infraorder Grassatores with about 200 described species. They are the sister group of the Gonyleptoidea.
Assamiidae are a family of harvestmen with more than 400 described species. It is the third most diverse family of the suborder Laniatores.
The Stygnopsidae are a small family of harvestmen, with almost all species found in Mexico.
The Stygnidae are a family of neotropical harvestmen within the suborder Laniatores.
Agoristenidae are a neotropical harvestman family of the Suborder Laniatores, in the superfamily Gonyleptoidea.
The Manaosbiidae are a family of neotropical harvestmen within the suborder Laniatores.
The Cranaidae are a family of neotropical harvestmen within the suborder Laniatores.
Kimulidae is a small neotropical family of the harvestman infraorder Grassatores with about thirty described species.
Podoctidae is a family of the harvestman infraorder Grassatores with about 130 described species.
Caelopyginae is a harvestmen sub-family in the family Gonyleptidae, containing the following genera:
Metasarcidae is a family of harvestmen, first described by Adriano Kury in 1994.
Discosomaticinae is a subfamily of harvestmen in the family Cosmetidae.
Ferkeriinae is a subfamily of harvestmen in the family Cosmetidae.
Taitoinae is a subfamily of harvestmen in the family Cosmetidae.
