Agelenopsis, commonly known as the American grass spiders, is a genus of funnel weavers described by C.G. Giebel in 1869. They weave sheet webs that have a funnel shelter on one edge. The web is not sticky, but these spiders make up for that by running very rapidly. The larger specimens can grow to about 19 mm in body length. They may be recognized by the arrangement of their eight eyes into three rows. The top row has two eyes, the middle row has four eyes, and the bottom row has two eyes. They have two prominent hind spinnerets, somewhat indistinct bands on their legs, and two dark bands running down either side of the cephalothorax.
Cybaeidae is a family of spiders first described by Nathan Banks in 1892. The diving bell spider or water spider Argyroneta aquatica was previously included in this family, but is now in the family Dictynidae.
Cicurina, also called the cave meshweaver, is a genus of dwarf sheet spiders that was first described by Anton Menge in 1871. Originally placed with the funnel weavers, it was moved to the Dictynidae in 1967, then to the Hahniidae in 2017. The name is from the Latin root "cucur-", meaning "to tame".
Dictyna is a genus of cribellate araneomorph spiders in the family Dictynidae, and was first described by Carl Jakob Sundevall in 1833.
Cybaeus is a genus of araneomorph spiders in the family Cybaeidae, first described by Ludwig Carl Christian Koch in 1868. It is found in America, Europe, Japan, Korea and China. Females of different species are difficult to distinguish, especially in North America. Images of males that include pedipalps are the easiest to determine species.
Spirembolus is a genus of North American sheet weavers that was first described by Ralph Vary Chamberlin in 1920.
Cybaeina is a genus of North American araneomorph spiders in the family Cybaeidae, and was first described by R. V. Chamberlin & Wilton Ivie in 1932. Originally described from a single female found in Olympia, Washington, it was placed with the Cybaeidae in 1967.
Cybaeozyga is a monotypic genus of North American araneomorph spiders in the family Cybaeidae containing the single species, Cybaeozyga heterops. It was first described by R. V. Chamberlin & Wilton Ivie in 1937, and was moved to the Cybaeidae in 1967. It has only been found in United States.
Blabomma is a genus of araneomorph spiders in the family Cybaeidae, and was first described by R. V. Chamberlin & Wilton Ivie in 1937. Originally placed with the funnel weavers, it was moved to the Dictynidae in 1967, and to the Cybaeidae in 2017.
Tricholathys is a genus of cribellate araneomorph spiders in the family Dictynidae, and was first described by R. V. Chamberlin & Wilton Ivie in 1935.
Yorima is a genus of araneomorph spiders in the family Cybaeidae and was first described by R. V. Chamberlin & Wilton Ivie in 1942. Originally placed in the funnel weaver family, it was moved to the Dictynidae in 1967, and to the Cybaeidae in 2017.
Calymmaria is a genus of North American araneomorph spiders in the family Cybaeidae, and was first described by R. V. Chamberlin & Wilton Ivie in 1937. They have body lengths ranging from 2 to 10 millimetres.
Dirksia is a genus of araneomorph spiders in the family Cybaeidae, and was first described by R. V. Chamberlin & Wilton Ivie in 1942 as a subgenus of Ethobuella. Originally placed with the funnel weavers, it was elevated to genus and moved to the dwarf sheet spiders in 1967, then moved to the Cybaeidae in 2017. As of May 2019 it contains only two species: D. cinctipes and D. pyrenaea.
Ethobuella is a genus of North American araneomorph spiders in the family Cybaeidae, and was first described by R. V. Chamberlin & Wilton Ivie in 1937. As of May 2019 it contains only two species: E. hespera and E. tuonops. Originally placed with the funnel weavers, it was elevated to genus and moved to the dwarf sheet spiders in 1967, then moved to the Cybaeidae in 2017.
Disembolus is a genus of North American dwarf spiders that was first described by Ralph Vary Chamberlin & Vaine Wilton Ivie in 1933.
Eulaira is a genus of North American dwarf spiders that was first described by Ralph Vary Chamberlin & Vaine Wilton Ivie in 1933.
Linyphantes is a genus of North American dwarf spiders that was first described by Ralph Vary Chamberlin & Vaine Wilton Ivie in 1942.
Phrurotimpus is a genus of araneomorph spiders first described by R. V. Chamberlin and Wilton Ivie in 1935. The name is a compound adjective meaning "guarding the stone". Originally added to the Liocranidae, it was moved to the Corinnidae in 2002, then to the Phrurolithidae in 2014. They have red egg sacs that look like flattened discs, often found on the underside of stones.
Piabuna is a genus of North American araneomorph spiders first described by R. V. Chamberlin & Wilton Ivie in 1933. Originally added to the Liocranidae, it was moved to the Corinnidae in 2002, then to the Phrurolithidae in 2014.
