Species list, Checklist of Class Arachnida (Arachnids) for West USA (USA)

Ants	Arachnids
Bees	Beetles
Booklice	Bugs
Bumblebees	Butterflies
Cicadas	Crane flies
Dragonflies	Earwigs
Flies	Isopods
Locusts	Mantises
Mayflies	Mosquitoes
Myriapods	Net-winged
Plant-parasitic	Scorpion flies
Termites	Wasps

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INSECTOIDGERENGDARK LIGHT

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Checklist for Class Arachnida Lamarck, 1801 (Arachnids)
and region West USA (USA)

Class

Arachnida
Lamarck, 1801
Arachnids

358
1430
3936

Families
Genera
Species

Taxom

List of families for West USA
358 Families width 3936 Species and 64 Subspecies

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Acalyptonotidae Walter, 1911		1	Species	Taxom
Acanthoscorpionidae Kjellesvig-W..., 1986		1	Species	Taxom
Acaridae Latreille, 1802	Acarid mites	14	Species	Taxom
Acarophenacidae Cross, 1965		1	Species	Taxom
Achipteriidae Thor, 1929		2	Species	Taxom
Adamystidae Cunliffe, 1957		0	Species	Taxom
Agelenidae C. L. Koch, 1837	Agelenid Spiders	47	Species	Taxom
Algophagidae Fain, 1974		1	Species	Taxom
Alloptidae Gaud, 1957		3	Species	Taxom
Alycidae Canestrini &..., 1877		0	Species	Taxom
Amaurobiidae Thorell, 1870	Amaurobiids	42	Species	Taxom
Amblyommidae Banks, 1907		15	Species	Taxom
Ameronothridae Willmann, 1931		4	Species	Taxom
Ameroseiidae Evans, 1961		2	Species	Taxom
Ametroproctidae Subías, 2004		1	Species	Taxom
Ammotrechidae Roewer, 1934	Curve-faced solifugid	13	Species	Taxom
Amphinectidae Forster & Wi..., 1973	Amphinectid spiders	1	Species	Taxom
Analgidae Trouessart &..., 1884	Feather mites	2	Species	Taxom
Anapidae Simon, 1895	Anapid spiders	2	Species	Taxom
Anisitsiellidae Koenike, 1910		5	Species	Taxom
Antennophoridae Berlese, 1892		0	Species	Taxom
Antrodiaetidae Gertsch, 1940	Folding trapdoor spider	23	Species	Taxom
Anyphaenidae Bertkau, 1878	Anyphaenid sac spiders	13	Species	Taxom
Anystidae Oudemans, 1936	Whirligig Mites	3	Species	Taxom
Apheviderulicidae Gerecke, Smi..., 1999		1	Species	Taxom
Araneidae Simon, 1895	Golden orb web spiders	113	Species	Taxom
Arctacaridae Evans, 1955		1	Species	Taxom
Argasidae C. L. Koch, 1844	Soft tick	20	Species	Taxom
Arrenuridae Thor, 1900		4	Species	Taxom
Ascidae Oudemans, 1905		11	Species	Taxom
Astegistidae Balogh, 1961		1	Species	Taxom
Atemnidae Chamberlin, 1931		2	Species	Taxom
Athienemanniidae Viets, 1922		4	Species	Taxom
Athyreacaridae Lindquist, K..., 1990		0	Species	Taxom
Aturidae Thor, 1900		33	Species	Taxom
Autognetidae Grandjean, 1960		1	Species	Taxom
Avenzoariidae Oudemans, 1905		1	Species	Taxom
Barbutiidae Robaux, 1975		1	Species	Taxom
Bdellidae Dugès, 1834	Snout Mites	8	Species	Taxom
Belbidae (Willmann, 1931)		0	Species	Taxom
Blattisociidae (Garman, 1948)		6	Species	Taxom
Bothriuridae Simon, 1880		1	Species	Taxom
Brachychthoniidae Thor, 1934		11	Species	Taxom
Branchioscorpionidae Kjellesvig-W..., 1986		1	Species	Taxom
Buthidae C. L. Koch, 1837	Arrowbreasted scorpions	12	Species	Taxom
Caeculidae Berlese, 1883	Rake-legged mites	2	Species	Taxom
Caleremaeidae Grandjean, 1965		2	Species	Taxom
Caligonellidae Grandjean, 1944		7	Species	Taxom
Camerobiidae Southcott, 1957	Stilt-legged mites	8	Species	Taxom
Camisiidae Oudemans, 1900		1	Species	Taxom
Caponiidae Simon, 1890	Caponiid spiders	6	Species	Taxom
Caraboacaridae Mahunka, 1970		0	Species	Taxom
Carabodidae Koch, 1837		5	Species	Taxom
Carpoglyphidae Oudemans, 1923	Driedfruit mites	1	Species	Taxom
Celaenopsidae Berlese, 1892		2	Species	Taxom
Cepheusidae Berlese, 1896		2	Species	Taxom
Ceratoppiidae (Kunst, 1971)		7	Species	Taxom
Ceratozetidae Jacot, 1925		22	Species	Taxom
Cercomegistidae Trägårdh, 1937		2	Species	Taxom
Ceresellidae P. G. Pavlit..., 1993		1	Species	Taxom
Chamobatidae Thor, 1937		3	Species	Taxom
Chappuisididae Motas & Tana..., 1946		4	Species	Taxom
Chapuisididae		3	Species	Taxom
Charinidae Quintero, 1986		2	Species	Taxom
Cheiridiidae Hansen, 1893		12	Species	Taxom
Cheliferidae Risso, 1826		15	Species	Taxom
Chernetidae Menge, 1855		35	Species	Taxom
Cheyletidae Leach, 1815		36	Species	Taxom
Chirodiscidae Trouessart, 1892		0	Species	Taxom
Chortoglyphidae Berlese, 1897		2	Species	Taxom
Chthoniidae Daday, 1888		39	Species	Taxom
Chyzeriidae Womersley, 1954		0	Species	Taxom
Clubionidae Wagner, 1887	Clubiones	34	Species	Taxom
Cocceupodidae Jesionowska, 2010		1	Species	Taxom
Corinnidae Karsch, 1880	Ant-like Sac Spiders	46	Species	Taxom
Cosmetidae C. L. Koch, 1839		2	Species	Taxom
Crotoniidae Thorell, 1876		17	Species	Taxom
Cryptognathidae Luxton, 1973		3	Species	Taxom
Ctenidae Keyserling, 1877	Tropical wolf spiders	4	Species	Taxom
Ctenizidae Thorell, 1887	Cork-lid trapdoor spider	2	Species	Taxom
Cunaxidae Thor, 1902	Predatory Mites	4	Species	Taxom
Cybaeidae Banks, 1892	Pond Water Spiders	20	Species	Taxom
Cyrtaucheniidae Simon, 1892	Cyrtaucheiid spiders	12	Species	Taxom
Damaeidae Berlese, 1896		8	Species	Taxom
Deinopidae C. L. Koch, 1850	Net-casters	1	Species	Taxom
Demodecidae Nicolet, 1855	Follicle mites	3	Species	Taxom
Dermanyssidae Kolenati, 1859	Dermanyssid mites	5	Species	Taxom
Dermationidae Fain, 1965		0	Species	Taxom
Dermoglyphidae Mégnin & Tro..., 1884		0	Species	Taxom
Desidae Pocock, 1895	Desid spiders	1	Species	Taxom
Dictynidae O. P-Cambridge, 1871	Dictynid spiders	108	Species	Taxom
Digamasellidae Evans, 1957		3	Species	Taxom
Diguetidae F. O. Pickar..., 1899	Coneweb spiders	1	Species	Taxom
Dinychidae Berlese, 1916		1	Species	Taxom
Diplogyniidae Trägårdh, 1941		0	Species	Taxom
Dipluridae Simon, 1889	Curtainweb Spiders	3	Species	Taxom
Diptilomiopidae Boczek, 1964		4	Species	Taxom
Dysderidae C. L. Koch, 1837	Dysderid spiders	3	Species	Taxom
Elliptochthoniidae Norton, 1975		1	Species	Taxom
Epicriidae Berlese, 1885		0	Species	Taxom
Epidermoptidae Trouessart, 1892		4	Species	Taxom
Epilohmanniidae Oudemans, 1923		1	Species	Taxom
Epimyodicidae Fain, Lukosc..., 1982		2	Species	Taxom
Eremaeidae Oudemans, 1900		22	Species	Taxom
Eremobatidae Kraepelin, 1899		131	Species	Taxom
Ereynetidae Schrank, 1776		4	Species	Taxom
Eriophyidae Nalepa, 1898	Blister mites	66	Species	Taxom
Erythraeidae Oudemans, 1902		8	Species	Taxom
Eulohmanniidae Grandjean, 1931		1	Species	Taxom
Eupalopsellidae Willmann, 1952		0	Species	Taxom
Euphthiracaridae Jacot, 1930		3	Species	Taxom
Eupodidae Strandtmann, 1967	Eupodid mites	4	Species	Taxom
Euzerconidae Trägårdh, 1938		0	Species	Taxom
Eviphididae Berlese, 1913		5	Species	Taxom
Eylaidae Leach, 1815		1	Species	Taxom
Fedrizziidae Trägårdh, 1937		1	Species	Taxom
Feltriidae Viets, 1926		20	Species	Taxom
Filistatidae Ausserer, 1867	Crevice weaver	7	Species	Taxom
Freyanidae Dubinin, 1953		1	Species	Taxom
Frontipodopsidae Viets, 1931		1	Species	Taxom
Galeodidae Sundevall, 1833		3	Species	Taxom
Galumnidae Jacot, 1925		3	Species	Taxom
Garypidae Simon, 1879		3	Species	Taxom
Garypinidae Daday, 1888		8	Species	Taxom
Geogarypidae Chamberlin, 1930		2	Species	Taxom
Glycyphagidae De Geer, 1778		12	Species	Taxom
Gnaphosidae Pocock, 1898	Flat-bellied ground spiders	179	Species	Taxom
Guanolichidae Fain, 1968		0	Species	Taxom
Gymnodamaeidae Grandjean, 1954		12	Species	Taxom
Hadruridae Stahnke, 1974		5	Species	Taxom
Haemogamasidae Oudemans, 1939		0	Species	Taxom
Hahniidae Bertkau, 1878	Dwarf sheet spiders	25	Species	Taxom
Halacaridae Murray, 1877	Sea mites	8	Species	Taxom
Halarachnidae Oudemans, 1906		3	Species	Taxom
Halolaelapidae Karg, 1965		2	Species	Taxom
Halonoproctidae Pocock, 1901		1	Species	Taxom
Haplozetidae Grandjean, 1936		3	Species	Taxom
Harpirhynchidae Dubinin, 1957		14	Species	Taxom
Hemileiidae (J. & P. Balogh, 1984)		1	Species	Taxom
Hemisarcoptidae Oudemans, 1904		1	Species	Taxom
Hermanniidae Sellnick, 1928		6	Species	Taxom
Hersiliidae Thorell, 1870	Hersiliids	1	Species	Taxom
Hesperolpiidae Chamberlin, 1930		2	Species	Taxom
Hexathelidae Simon, 1892	Australian funnelweb spiders	1	Species	Taxom
Histiostomatidae Berlese, 1897		10	Species	Taxom
Homalonychidae Simon, 1893	Dusty desert spiders	1	Species	Taxom
Hormuridae Laurie, 1896		2	Species	Taxom
Hubbardiidae Cook, 1899	Hubbardiid shorttailed whipscorpions	8	Species	Taxom
Humerobatidae Grandjean, 1970		5	Species	Taxom
Hyadesiidae Halbert, 1915		3	Species	Taxom
Hydrachnidae Leach, 1815		0	Species	Taxom
Hydrovolziidae Thor, 1905		0	Species	Taxom
Hydrozetidae Grandjean, 1954		1	Species	Taxom
Hydryphantidae Piersig, 1896		7	Species	Taxom
Hygrobatidae Koch, 1842		5	Species	Taxom
Hypochilidae Marx, 1888	Lampshade spiders	6	Species	Taxom
Hypochthoniidae Berlese, 1910		1	Species	Taxom
Hypoderatidae (Murray, 1877)		2	Species	Taxom
Ideoroncidae Chamberlin, 1930		6	Species	Taxom
Idiopidae Simon, 1892	Armored trapdoor spiders	3	Species	Taxom
Iolinidae Pritchard, 1956		1	Species	Taxom
Ischyropsalididae Simon, 1879		8	Species	Taxom
Isobuthidae Petrunkevitch, 1913		0	Species	Taxom
Ixodidae C. L. Koch, 1844	Hard Tick	22	Species	Taxom
Ixodorhynchidae Ewing, 1923		0	Species	Taxom
Johnstonianidae Thor, 1935		2	Species	Taxom
Knemidokoptidae (Lavoipierre ..., 1951)		0	Species	Taxom
Kodiakellidae Hammer, 1967		1	Species	Taxom
Labidostommatidae Oudemans, 1904		0	Species	Taxom
Laelapidae Berlese, 1892		26	Species	Taxom
Laminosioptidae Vitzthum, 1931		0	Species	Taxom
Larcidae Harvey, 1992		6	Species	Taxom
Lardoglyphidae Oudemans, 1927		1	Species	Taxom
Lebertiidae Thor, 1900		1	Species	Taxom
Leeuwenhoekiidae Womersley, 1944	Chigger mites	2	Species	Taxom
Leptolaelapidae Karg, 1978		1	Species	Taxom
Leptonetidae Simon, 1890	Cave spiders	10	Species	Taxom
Liacaridae Sellnick, 1928		5	Species	Taxom
Liebstadiidae J. & P. Balogh, 1984		1	Species	Taxom
Limnesiidae Thor, 1900		4	Species	Taxom
Limnozetidae Thor, 1937		3	Species	Taxom
Linotetranidae Baker & Prit..., 1953		0	Species	Taxom
Linyphiidae Blackwall, 1859	Dwarf spiders	499	Species	Taxom
Liocranidae Simon, 1897	Liocranid sac spiders	10	Species	Taxom
Listrophoridae Mégnin & Tro..., 1884		20	Species	Taxom
Lycosidae Lehtinen & H..., 1979	Ground Spiders	148	Species	Taxom
Macrochelidae Vitzthum, 1930		13	Species	Taxom
Macronyssidae Oudemans, 1936	Macronyssid Mites	3	Species	Taxom
Malaconothridae Berlese, 1916		2	Species	Taxom
Mecicobothriidae Holmberg, 1882	Dwarf tarantula	3	Species	Taxom
Melicharidae (Hirschmann, 1962)		5	Species	Taxom
Menthidae J.C. Chamberlin, 1930		1	Species	Taxom
Mesoplophoridae Ewing, 1917		1	Species	Taxom
Metagynuridae Baker & Wharton, 1952		0	Species	Taxom
Microdispidae Cross, 1965		0	Species	Taxom
Microgyniidae Trägårdh, 1942		0	Species	Taxom
Microtrombidiidae Womersley, 1936	Micro velvet mites	1	Species	Taxom
Mideidae Thor, 1911		1	Species	Taxom
Mideopsidae Koenike, 1910		7	Species	Taxom
Mimetidae Simon, 1881	Pirate spider	5	Species	Taxom
Miturgidae Simon, 1885	Long-legged sac spiders	7	Species	Taxom
Momoniidae Viets, 1926		8	Species	Taxom
Myobiidae Megnin, 1877		13	Species	Taxom
Myocoptidae Gunther, 1942		4	Species	Taxom
Mysmenidae Petrunkevitch, 1928	Dwarf cobweb spiders	2	Species	Taxom
Nanhermanniidae Sellnick, 1928		2	Species	Taxom
Nanorchestidae Luxton, 1984		4	Species	Taxom
Nemastomatidae Simon, 1872		11	Species	Taxom
Neoacaridae (Motas & Tana..., 1947)		2	Species	Taxom
Neobisiidae Chamberlin, 1930		39	Species	Taxom
Neopygmephoridae Cross, 1965		1	Species	Taxom
Neothrombiidae Feider, 1959		1	Species	Taxom
Nesticidae Simon, 1894	Cave cobweb spider	2	Species	Taxom
Nosybelbidae Mahunka, 1994		12	Species	Taxom
Nothridae Berlese, 1896		5	Species	Taxom
Ochyroceratidae Fage, 1912	Midget ground weaver	1	Species	Taxom
Oecobiidae Blackwall, 1862	Disc web spider	6	Species	Taxom
Ologamasidae Ryke, 1962		7	Species	Taxom
Olpiidae Banks, 1895		1	Species	Taxom
Oonopidae Simon, 1890	Dwarf Cell Spiders	13	Species	Taxom
Oppiidae Sellnick, 1937		8	Species	Taxom
Oribatellidae Jacot, 1925		4	Species	Taxom
Oribatulidae Thor, 1929		7	Species	Taxom
Oribellidae (Kunst, 1971)		3	Species	Taxom
Oribotritiidae Grandjean, 1954		2	Species	Taxom
Oripodidae Jacot, 1925		1	Species	Taxom
Oxidae Viets, 1926		0	Species	Taxom
Oxyopidae Thorell, 1870	Lynx spiders	9	Species	Taxom
Pachylaelapidae Berlese, 1913		1	Species	Taxom
Palaeacaridae Grandjean, 1932		1	Species	Taxom
Parakalummidae Grandjean, 1936		1	Species	Taxom
Paranonychidae (Briggs, 1971)		16	Species	Taxom
Parasitidae Oudemans, 1901	Beetle Mites	11	Species	Taxom
Parattidae Petrunkevitch, 1922		4	Species	Taxom
Paratydeidae Baker, 1949		0	Species	Taxom
Parholaspididae Evans, 1956		2	Species	Taxom
Peloppiidae Balogh, 1943		1	Species	Taxom
Pentanychidae Briggs, 1971		5	Species	Taxom
Penthaleidae Oudemans, 1931	Earth Mites	2	Species	Taxom
Penthalodidae Strandtmann, 1964		1	Species	Taxom
Perlohmanniidae Grandjean, 1954		1	Species	Taxom
Phalangiidae Latreille, 1802	Daddy-Long-Legs	19	Species	Taxom
Phalangodidae Simon, 1879		64	Species	Taxom
Phenopelopidae Petrunkevitch, 1955		5	Species	Taxom
Philodromidae Thorell, 1870	False crab spiders	55	Species	Taxom
Pholcidae C. L. Koch, 1851	Carpenter spider	23	Species	Taxom
Phrynidae Blanchard, 1852		1	Species	Taxom
Phthiracaridae Perty, 1841		14	Species	Taxom
Phytoptidae Manson, 1970		11	Species	Taxom
Phytoseiidae Berlese, 1916	Phytoseiid mites	36	Species	Taxom
Pimoidae Wunderlich, 1986	Pimoid spiders	6	Species	Taxom
Pionidae Thor, 1900		14	Species	Taxom
Pisauridae Simon, 1890	Big wolf spider	8	Species	Taxom
Plateremaeidae Trägårdh, 1931		0	Species	Taxom
Plectreuridae Simon, 1893	Plectreurid spider	5	Species	Taxom
Pneumocoptidae Fain, 1957		0	Species	Taxom
Podapolipidae Husband, 1990		6	Species	Taxom
Polyaspididae Berlese, 1913		2	Species	Taxom
Praearcturidae Kjellesvig-W..., 1986		0	Species	Taxom
Proctophyllodidae Trouessart &..., 1884		7	Species	Taxom
Prokoeneniidae Condé, 1991		1	Species	Taxom
Proscorpiidae Scudder, 1885		1	Species	Taxom
Pseudocheylidae Oudemans, 1909		0	Species	Taxom
Pseudogarypidae J.C. Chamberlin, 1923		4	Species	Taxom
Psoralgidae Oudemans, 1908		0	Species	Taxom
Psorergatidae Womersley, 1941		2	Species	Taxom
Psoroptidae Hering, 1838	Scab mites	2	Species	Taxom
Psoroptoididae Gaud, 1958		1	Species	Taxom
Pterolichidae Trouessart, 1899		1	Species	Taxom
Pteronyssidae Oudemans, 1941		2	Species	Taxom
Pterygosomatidae Womersley, 1941		0	Species	Taxom
Ptiloxenidae Gaud, 1982		1	Species	Taxom
Punctoribatidae Thor, 1937		15	Species	Taxom
Pyemotidae Newport, 1850		2	Species	Taxom
Pygmephoridae Krczal, 1964		7	Species	Taxom
Pyroglyphidae Cunliffe, 1958	Dust mites	0	Species	Taxom
Quadroppiidae Balogh, 1983		1	Species	Taxom
Raillietiidae Vitzthum, 1943		1	Species	Taxom
Raphignathidae Kramer, 1877		1	Species	Taxom
Rhagidiidae Zacharda, 1980		20	Species	Taxom
Rhinonyssidae Trouessart, 1895		1	Species	Taxom
Rhodacaridae Oudemans, 1902		1	Species	Taxom
Sabaconidae Dresco, 1970	Sabaconid Harvestmen	9	Species	Taxom
Salticidae Blackwall, 1842	Jumping Spider	222	Species	Taxom
Sarcoptidae Megnin, 1877	Itch mites	3	Species	Taxom
Scheloribatidae Jacot, 1935		2	Species	Taxom
Schizogyniidae Trägårdh, 1950		1	Species	Taxom
Sclerosomatidae Simon, 1879	Sclerosomatid Harvestmen	30	Species	Taxom
Scutacaridae Paoli, 1911		0	Species	Taxom
Scytodidae Blackwall, 1864	Glue spitter	3	Species	Taxom
Segestriidae Simon, 1893	Six-eyed Spiders	8	Species	Taxom
Sejidae Berlese, 1885		4	Species	Taxom
Selenopidae Simon, 1897	Flatties	1	Species	Taxom
Sicariidae Keyserling, 1880	Brown recluse spiders	8	Species	Taxom
Sironidae Simon, 1879		9	Species	Taxom
Siteroptidae Martin, 1978	Siteroptid mites	2	Species	Taxom
Smarididae Kramer, 1878		1	Species	Taxom
Sparassidae Bertkau, 1872	Giant crab spiders	6	Species	Taxom
Sperchontidae Thor, 1900		3	Species	Taxom
Spinturnicidae Oudemans, 1902		4	Species	Taxom
Stigmaeidae Wood, 1967		10	Species	Taxom
Stigmocheylidae (Kethley, 1990)		0	Species	Taxom
Stygothrombiidae Thor, 1935		2	Species	Taxom
Suctobelbidae Jacot, 1938		6	Species	Taxom
Superstitioniidae Stahnke, 1940		1	Species	Taxom
Syarinidae Chamberlin, 1930		8	Species	Taxom
Syringobiidae Trouessart, 1897		3	Species	Taxom
Syringophilidae Lavoipierre, 1953	Quill mites	23	Species	Taxom
Tanaupodidae Thor, 1935		1	Species	Taxom
Taracidae Schönhofer, 2013		18	Species	Taxom
Tarsocheylidae Berlese, 1904		0	Species	Taxom
Tarsonemidae Kramer, 1877	Tarsonemid mites	33	Species	Taxom
Tectocepheidae Grandjean, 1954		1	Species	Taxom
Tegoribatidae Grandjean, 1954		6	Species	Taxom
Telemidae Fage, 1913	Long-legged cave spider	3	Species	Taxom
Tengellidae (Dahl, 1908)	Tengellid spiders	13	Species	Taxom
Tenuialidae Jacot, 1929		2	Species	Taxom
Tenuipalpidae Berlese, 1913	False spider mites	26	Species	Taxom
Terpnacaridae Grandjean, 1939		0	Species	Taxom
Tetrablemmidae O. P-Cambridge, 1873	Armored spider	1	Species	Taxom
Tetragnathidae Menge, 1866	Elongated Orb Weavers	32	Species	Taxom
Tetranychidae Donnadieu, 1875	Spider mites	71	Species	Taxom
Thelyphonidae Lucas, 1835		2	Species	Taxom
Theraphosidae Thorell, 1870	Bird-eating spiders	16	Species	Taxom
Theridiidae Sundevall, 1833	Cobweb And Widow Spiders	127	Species	Taxom
Theridiosomatidae Simon, 1881	Ray orbweavers	2	Species	Taxom
Thermacaridae Sokolow, 1927		2	Species	Taxom
Thomisidae Sundevall, 1833	Crab Spider	97	Species	Taxom
Thyrisomidae Grandjean, 1953		1	Species	Taxom
Titanoecidae Lehtinen, 1967	Rock Weavers	5	Species	Taxom
Torrenticolidae Thor, 1902	Torrent Mites	18	Species	Taxom
Trachytidae Tragärdh, 1938		1	Species	Taxom
Trachyuropodidae Kramer, 1881		0	Species	Taxom
Travuniidae Absolon & Kr..., 1932		12	Species	Taxom
Trematuridae Berlese, 1917		9	Species	Taxom
Trhypochthoniidae Willmann, 1931		4	Species	Taxom
Triaenonychidae Sörensen, 1886		1	Species	Taxom
Trogloraptoridae Griswold, A..., 2012		1	Species	Taxom
Trombiculidae Ewing, 1929	Chigger mites	6	Species	Taxom
Trombidiidae Leach, 1815	Beer Bahuti	6	Species	Taxom
Trouessartiidae Gaud, 1957		1	Species	Taxom
Turbinoptidae Fain, 1957		1	Species	Taxom
Tydeidae Kramer, 1877	Tydeid mites	1	Species	Taxom
Uloboridae Thorell, 1869	Cribellate orb weavers	6	Species	Taxom
Unionicolidae Oudemans, 1909		4	Species	Taxom
Urodinychidae Berlese, 1917		6	Species	Taxom
Uropodidae Kramer, 1881		5	Species	Taxom
Vaejovidae Thorell, 1876		63	Species	Taxom
Varroidae Delfinado & ..., 1974		1	Species	Taxom
Veigaiidae Oudemans, 1939		3	Species	Taxom
Wettinidae Cook, 1956		1	Species	Taxom
Winterschmidtiidae Oudemans, 1923		0	Species	Taxom
Withiidae Chamberlin, 1931		1	Species	Taxom
Xenillidae Woolley & Hi..., 1966		0	Species	Taxom
Zerconidae Berlese, 1892		5	Species	Taxom
Zodariidae Thorell, 1881	Ant spiders	3	Species	Taxom
Zoridae F. O. P-Camb..., 1893	Wandering Spiders	1	Species	Taxom
Zoropsidae Bertkau, 1882	False Huntsman Spiders	1	Species	Taxom

Subnodes of Arachnida with occurrences in West USA

Subclass	Dromopoda Shultz, 1990	44 179 623	Families Genera Species	Taxom
Subclass	Micrura Ehrenberg, 1831	314 1250 3312	Families Genera Species	Taxom

Arachnida (Lamarck 1801)

Links, sources and further information

Arachnida at biolcoll.utu.fi
Arachnida at wiki.spinnen-forum.de
Arachnida at spiderling.de
Arachnida at wsc.nmbe.ch
Arachnida at artfakta.se
Arachnida at biodiversity.org.au
Arachnida at dyntaxa.se
Arachnida at gbif.org
Arachnida at irmng.org
Arachnida at itis.gov
Arachnida at marinespecies.org