Liocranidae is a family of araneomorph spiders first described by Eugène Simon in 1897. They are one of several groups called "sac spiders". The holarctic genus Agroeca is the best-known, but it also includes various genera of more obscure spiders that still lack a diagnosis. Two species in the North American genus Neoanagraphis are found in the extremely dry conditions in the Mojave, Sonoran and Chihuahuan deserts. Females live in animal burrows while males wander and are the ones most often caught in pitfall traps.
Leptonetidae is a family of small spiders adapted to live in dark and moist places such as caves. The family is relatively primitive having diverged around the Middle Jurassic period. They were first described by Eugène Simon in 1890.
Norman Ira Platnick was an American biological systematist and arachnologist. At the time of his death, he was a professor emeritus of the Richard Gilder Graduate School and Peter J. Solomon Family Curator Emeritus of the invertebrate zoology department of the American Museum of Natural History. A 1973 Ph.D. recipient at Harvard University, Platnick described over 1,800 species of spiders from around the world, making him the second most prolific spider taxonomist in history, behind only Eugène Simon. Until 2014 he was also the maintainer of the World Spider Catalog, a website formerly hosted by the AMNH which tracks the arachnology literature, and attempts to maintain a comprehensive list, sorted taxonomically, of every species of spider which has been formally described. In 2007 he received the International Society of Arachnology's Bonnet award, named for Pierre Bonnet, in recognition of his work on the catalog.
Microstigmatidae is a small family of spiders with about 25 described species in eight genera. They are small ground-dwelling and free-living spiders that make little use of silk.
Symphytognathidae is a family of spiders with 90 described species in eight genera. They occur in the tropics of Central and South America and the Australian region. Exceptions include Anapistula benoiti, Anapistula caecula, and Symphytognatha imbulunga, found in Africa, Anapistula ishikawai, found in Japan, and Anapistula jerai, found in Southeast Asia.
Sphodros is a genus of North American purseweb spiders first described by Charles Athanase Walckenaer in 1835. It was considered a synonym of Atypus until 1980.
Sphodros rufipes, sometimes called the red legged purseweb spider, is a mygalomorph spider from the southern United States, though it has been photographed as far north as Indiana, Missouri, New Jersey, Minnesota, Tennessee, Delaware, Louisiana, and Tuckernuck Island in Massachusetts [West Virginia]. A recent sighting shows that these spiders can also be found in Canada. Recent sighting also in Kansas.
Cesonia is a genus of ground spiders that was first described by Eugène Simon in 1893.
Sphodros niger, the black purse-web spider, is a mygalomorph spider from the Eastern United States. It is listed as a special concern species in Connecticut.
Hexurella is a genus of spiders, found in the United States and Mexico. It is the only genus in the family Hexurellidae.
Hypochilus is a genus of North American lampshade spiders that was first described by George Marx in 1888.
Micaria is a genus of ground spiders that was first described by Niklas Westring in 1851. They are 1.3 to 6.5 millimetres long.
Anapisona is a genus of araneomorph spiders in the family Anapidae, first described by Willis J. Gertsch in 1941.
Appaleptoneta is a genus of North American Leptonetids that was first described by Norman I. Platnick in 1986.
Calileptoneta is a genus of North American Leptonetids that was first described by Norman I. Platnick in 1986.
Noonops is a genus of spiders in the family Oonopidae. It was first described in 2013 by Platnick & Berniker. As of 2017, it contains 23 species from the U.S., Mexico, and the Bahamas.
Selenyphantes is a genus of sheet weavers. It was first described by Willis J. Gertsch & L. I. Davis in 1946.
Zorocrates is a genus of spiders in the family Zoropsidae. It was first described in 1888 by Simon. As of 2017, it contains 31 species.
