Cheiracanthium, commonly called yellow sac spiders, is a genus of araneomorph spiders in the family Cheiracanthiidae, and was first described by Carl Ludwig Koch in 1839. They are usually pale in colour, and have an abdomen that can range from yellow to beige. Both sexes range in size from 5 to 10 millimetres. They are unique among common house spiders because their tarsi do not point either outward, like members of Tegenaria, or inward, like members of Araneus), making them easier to identify. The name is a reference to the backwardly directed process on the cymbium of the male palp. The species epithet is derived from the Greek Ancient Greek: χείρ, romanized: cheir, meaning "hand", and Acanthium, a genus of thorny-stemmed plants.
Drassodes is a genus of ground spiders that was first described by Niklas Westring in 1851. They are brown, gray, and red spiders that live under rocks or bark in mostly dry habitats, and are generally 3.8 to 11.6 millimetres long, but can reach up to 20 millimetres (0.79 in) in length.
Ozyptila is a genus of crab spiders that was first described by Eugène Louis Simon in 1864. It has been misspelled as "Oxyptila" in multiple accounts.
Neriene is a genus of sheet weavers that was first described by John Blackwall in 1833.
Neoscona, known as spotted orb-weavers and barn spiders, is a genus of orb-weaver spiders (Araneidae) first described by Eugène Simon in 1895 to separate these from other araneids in the now obsolete genus Epeira. The name Neoscona was derived from the Greek νέω, meaning "spin", and σχοῐνος, meaning "reed" They have a mostly pantropical distribution and one species, Neoscona adianta, has a palearctic distribution. As of April 2019 there are eight species that can be found in the United States and Canada:
Clubiona is a genus of sac spiders that was first described by Pierre André Latreille in 1804.
Ceratinella is a genus of dwarf spiders that was first described by James Henry Emerton in 1882. They are very similar to both Ceraticelus and Idionella, and the taxonomy of these spiders may change.
Erigone is a genus of dwarf spiders that was first described by Jean Victoire Audouin in 1826. They are carnivorous, preying on small insects such as psylla and flies. One of the distinctive characters for this genus is the presence of teeth bordering the carapace.
Dictyna is a genus of cribellate araneomorph spiders in the family Dictynidae, and was first described by Carl Jakob Sundevall in 1833.
Gnaphosa is a genus of ground spiders that was first described by Pierre André Latreille in 1804. They all have a serrated keel on the retromargin of each chelicera.
Bathyphantes is a genus of dwarf spiders that was first described by Anton Menge in 1866.
Agyneta is a genus of dwarf spiders that was first described by J. E. Hull in 1911.
Robertus is a genus of comb-footed spiders that was first described by Octavius Pickard-Cambridge in 1879. It is considered a senior synonym of Garritus.
Scotophaeus is a genus of ground spiders that was first described by Eugène Simon in 1893.
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.
Gonatium is a genus of dwarf spiders that was first described by Anton Menge in 1868.
Collinsia is a genus of dwarf spiders that was first described by Octavius Pickard-Cambridge in 1913.
Singa, also called striped orb-weavers, is a genus of orb-weaver spiders first described by C. L. Koch in 1836. They are small for orb-weavers, reaching 6 millimetres (0.24 in) or less in body length, excluding the legs.
