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.
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 endemic of the New World with a Nearctic-Neotropical distribution where a large fraction of the diversity of Opiliones are represented by this single family. Cosmetidae have the northern extent of their range into the USA, where a small number species occur in the southern states. However, the family is especially diverse in Mexico, Central America and northern South America; especially the Andean realms. Their range also extends further south into Argentina and southern Brazil, but they are absent in Chile. Cosmetidae are prevalent in Amazonian region, but only relatively few also occur in Brazilian Atlantic Forest. Several species are also found in the Caribbean.
The Stygnidae 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.
The Fissiphalliidae are a small neotropical family of harvestmen within the suborder Laniatores.
Eutimesius is a genus of harvestmen in the family Stygnidae with five described species. All species are found in South America.
Neosiro kamiakensis is a species of mite harvestman in the family Sironidae. It is found in North America.
Arhesiro clousi is a species of mite harvestman in the family Sironidae.. It is found in North America, specifically USA, Oregon, Lincoln County.
Holosiro acaroides is a species of mite harvestman in the family Sironidae. It is found in North America, specifically USA in the states of Washington, Oregon, & California.
'Neosiro boyerae is a species of mite harvestman in the family Sironidae. It is found in North America, specifically USA, Oregon, Lincoln County.
Arhesiro sonoma is a species of mite harvestman in the family Sironidae. It is found in North America, specifically USA, California, Sonoma County.
Holosiro shasta is a species of mite harvestman in the family Sironidae. It is found in North America, specifically California, Shasta county.
Holosiro calaveras is a species of mite harvestman in the family Sironidae. It is found in North America, specifically California in Calaveras county.
Rakaia is a genus of harvestmen in the family Pettalidae with eighteen described species. All species are found in New Zealand.
Arhesiro is a genus of mite harvestman in the family Sironidae. It is found in North America, only in the USA, with one species in California, another in Oregon.
Holosiro is a genus of mite harvestman in the family Sironidae. It is found in North America, only in the USA, with one species in California, another in Oregon.
Asarcus is a genus of harvestmen in the family Gonyleptidae with four described species. All species are found in Brazil.
Bourguyia is a genus of harvestmen in the family Gonyleptidae with four described species. All species are found in Brazil.
Spaeleoleptes is a genus of harvestmen in the family Escadabiidae with two described species. Both species are found in Brazil as cave endemics.
