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.
Opilio is a genus of harvestmen with 35 known species.
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 Phalangodidae are a family of harvestmen with about 30 genera and more than 100 described species, distributed in the Holarctic region.
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.
The Stylocellidae are a family of harvestmen with about 40 described species, all of which occur in Southern or Southeastern Asia. Members of this family are from one to seven millimeters long. While Stylocellus species have eyes, these are absent in the other two genera.
Epedanoidea is a small superfamily of the Grassatores. It includes around 355 species distributed in Asia, primarily Southeast Asia.
Epedanidae is a family of the harvestman infraorder Grassatores with about 200 described species. They are the sister group of the Gonyleptoidea.
Sandokanidae is a family of harvestmen in the suborder Laniatores, formerly referred to as Oncopodidae
Escadabiidae is a small neotropical family of the harvestman infraorder Grassatores with six 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.
Yania is a genus of harvestmen from South America. Yania flavolimbata is the only species in the monotypic genus Yania. It was first described by Roewer, 1914.
Eutimesius is a genus of harvestmen in the family Stygnidae with five described species. All species are found in South America.
Acropsopilionoidea is a superfamily of harvestmen with 1 family and 3 genera, found in North America and the Southern Hemisphere.
Bourguyia is a genus of harvestmen in the family Gonyleptidae with four described species. All species are found in Brazil.
Poecilaemula is a genus of harvestmen in the family Cosmetidae with eight described species. All species are from Central America or South America. An overview of the taxonomy was provided by Medrano et al. (2024)
Poecilaemula signata is a species of harvestmen from Central America in the family Cosmetidae. It was first described by Banks in 1909.
