| Agelenopsis oklahoma | Funnel weaver spider | Arachnida | Agelenidae | P |
| Agelenopsis oregonensis | Funnel weaver spider | Arachnida | Agelenidae | P |
| Agelenopsis potteri | Funnel weaver spider | Arachnida | Agelenidae | C |
| Agelenopsis utahana | Funnel weaver spider | Arachnida | Agelenidae | P |
| Eratigena agrestis | Hobo Spider | Arachnida | Agelenidae | C |
| Eratigena duellica | Giant House Spider | Arachnida | Agelenidae | C |
| Tegenaria domestica | Barn Funnel Weaver | Arachnida | Agelenidae | C |
| Callobius canada | Tangled nest spider | Arachnida | Amaurobiidae | P |
| Callobius enus | Tangled nest spider | Arachnida | Amaurobiidae | P |
| Callobius nomeus | Hacklemesh weaver spider | Arachnida | Amaurobiidae | P |
| Antrodiaetus hageni | Folding-door spider | Arachnida | Antrodiaetidae | C |
| Anyphaena pacifica | Sac spider, ghost spider | Arachnida | Anyphaenidae | P |
| Aculepeira packardi | Northern Orbweaver | Arachnida | Araneidae | P |
| Araneus corticarius | Orb weaver spider | Arachnida | Araneidae | P |
| Araneus diadematus | Diadem Spider, Cross Orb Weaver | Arachnida | Araneidae | C |
| Araneus gemma | Gem-shaped Orbweaver | Arachnida | Araneidae | P |
| Araneus gemmoides | Cat-faced Spider, Jewel Spider | Arachnida | Araneidae | C |
| Araneus marmoreus | Gem-shaped Orbweaver, Marbled Orbweaver | Arachnida | Araneidae | P |
| Araneus nordmanni | Nordmann's Orbweaver | Arachnida | Araneidae | C |
| Araneus saevus | Fierce Orbweaver | Arachnida | Araneidae | C |
| Araneus trifolium | Shamrock Orbweaver | Arachnida | Araneidae | P |
| Araniella displicata | Six-spotted Orbweaver | Arachnida | Araneidae | C |
| Argiope trifasciata | Banded Garden Spider | Arachnida | Araneidae | C |
| Cyclosa conica | Conical Trashline Orbweaver | Arachnida | Araneidae | C |
| Hypsosinga groenlandica | Orbweaver | Arachnida | Araneidae | TBD |
| Hypsosinga pygmaea | Small Orbweaver | Arachnida | Araneidae | P |
| Hypsosinga rubens | Rubens Orbweaver | Arachnida | Araneidae | P |
| Larinioides cornutus | Furrow orbweaver | Arachnida | Araneidae | C |
| Larinioides patagiatus | Ornamental Orbweaver | Arachnida | Araneidae | C |
| Larinioides sclopetarius | Grey Cross Spider | Arachnida | Araneidae | C |
| Metepeira grandiosa | Orb weaver spider | Arachnida | Araneidae | P |
| Metepeira palustris | Orb weaver spider | Arachnida | Araneidae | P |
| Neoscona arabesca | Arabesque Orb weaver, Arabaesque Orbweaver | Arachnida | Araneidae | P |
| Cheiracanthium inclusum | Agrarian Sac Spider | Arachnida | Cheiracanthiidae | P |
| Cheiracanthium mildei | Yellow Sac Spider | Arachnida | Cheiracanthiidae | C |
| Clubiona canadensis | Leafcurling sac spider | Arachnida | Clubionidae | P |
| Clubiona mimula | Leafcurling sac spider | Arachnida | Clubionidae | P |
| Clubiona moesta | Leafcurling sac spider | Arachnida | Clubionidae | P |
| Clubiona norvegica | Leafcurling sac spider | Arachnida | Clubionidae | P |
| Clubiona riparia | Riparian Sac Spider | Arachnida | Clubionidae | P |
| Clubiona trivialis | Leafcurling sac spider | Arachnida | Clubionidae | P |
| Castianeira alteranda | Prairie Ant-mimic Sac Spider | Arachnida | Corinnidae | TBD |
| Castianeira longipalpa | Long-palped Ant-mimic Sac Spider | Arachnida | Corinnidae | P |
| Castianeira walsinghami | Ant-mimic sac spider | Arachnida | Corinnidae | P |
| Cryphoeca exlineae | Cybaeid spider | Arachnida | Cybaeidae | P |
| Cybaeus charlesi | Woodland spider, soft spider | Arachnida | Cybaeidae | P |
| Dictyna coloradensis | Mesh web weaver | Arachnida | Dictynidae | P |
| Dictyna major | Meshweaver, Dictynid spider | Arachnida | Dictynidae | P |
| Dictyna minuta | Meshweaver, Dictynid spider | Arachnida | Dictynidae | C |
| Dictyna personata | Meshweaver, Dictynid spider | Arachnida | Dictynidae | P |
| Dictyna subpinicola | Meshweaver, Dictynid spider | Arachnida | Dictynidae | C |
| Dictyna volucripes | Meshweaver, Dictynid spider | Arachnida | Dictynidae | P |
| Emblyna annulipes | Meshweaver, Dictynid spider | Arachnida | Dictynidae | C |
| Emblyna borealis cavernosa | Meshweaver, Dictynid spider | Arachnida | Dictynidae | P |
| Emblyna chitina | Meshweaver, Dictynid spider | Arachnida | Dictynidae | C |
| Emblyna completa | Meshweaver, Dictynid spider | Arachnida | Dictynidae | P |
| Emblyna horta | Meshweaver, Dictynid spider | Arachnida | Dictynidae | P |
| Emblyna phylax | Meshweaver, Dictynid spider | Arachnida | Dictynidae | P |
| Emblyna reticulata | Meshweaver, Dictynid spider | Arachnida | Dictynidae | P |
| Mallos niveus | Mexican social spider | Arachnida | Dictynidae | C |
| Tricholathys spiralis | Meshweaver, Dictynid spider | Arachnida | Dictynidae | P |
| Dysdera crocata | Woodlouse Spider | Arachnida | Dysderidae | TBD |
| Callilepis eremella | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Drassodes neglectus | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Drassodes saccatus | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Drassyllus depressus | Gnaphosid ground spider | Arachnida | Gnaphosidae | C |
| Drassyllus dromeus | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Drassyllus insularis | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Drassyllus lamprus | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Drassyllus niger | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Gnaphosa californica | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Gnaphosa muscorum | Moss Ground Hunter | Arachnida | Gnaphosidae | P |
| Haplodrassus bicornis | Gnaphosid ground spider | Arachnida | Gnaphosidae | C |
| Haplodrassus eunis | Gnaphosid ground spider | Arachnida | Gnaphosidae | TBD |
| Haplodrassus signifer | Ensign Ground Hunter | Arachnida | Gnaphosidae | P |
| Herpyllus hesperolus | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Micaria coloradensis | Gnaphosid ground spider | Arachnida | Gnaphosidae | TBD |
| Micaria constricta | Gnaphosid ground spider | Arachnida | Gnaphosidae | TBD |
| Micaria foxi | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Micaria idana | Gnaphosid ground spider | Arachnida | Gnaphosidae | TBD |
| Micaria laticeps | Gnaphosid ground spider | Arachnida | Gnaphosidae | TBD |
| Micaria longipes | Gnaphosid ground spider | Arachnida | Gnaphosidae | TBD |
| Micaria longispina | Gnaphosid ground spider | Arachnida | Gnaphosidae | TBD |
| Micaria pulicaria | Glossy Ant-spider | Arachnida | Gnaphosidae | P |
| Micaria riggsi | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Micaria rossica | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Nodocion eclecticus | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Nodocion mateonus | Gnaphosid ground spider | Arachnida | Gnaphosidae | TBD |
| Nodocion rufithoracicus | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Nodocion voluntarius | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Scotophaeus blackwalli | Mouse spider | Arachnida | Gnaphosidae | TBD |
| Sergiolus columbianus | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Sergiolus montanus | Common Patterned Ant-Mimic Ground Spider | Arachnida | Gnaphosidae | C |
| Zelotes fratris | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Zelotes puritanus | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Zelotes tuobus | Gnaphosid ground spider | Arachnida | Gnaphosidae | P |
| Cicurina idahoana | Idaho Meshweaver | Arachnida | Hahniidae | P |
| Cicurina intermedia | Dwarf sheet spider | Arachnida | Hahniidae | P |
| Cicurina robusta | Dwarf sheet spider | Arachnida | Hahniidae | TBD |
| Agyneta fillmorana | Dwarf black Linyphiid spider | Arachnida | Linyphiidae | P |
| Agyneta micaria | Dwarf black Linyphiid spider | Arachnida | Linyphiidae | P |
| Agyneta olivacea | Dwarf black Linyphiid spider | Arachnida | Linyphiidae | P |
| Agyneta ordinaria | Dwarf black Linyphiid spider | Arachnida | Linyphiidae | P |
| Agyneta perspicua | Dwarf black Linyphiid spider | Arachnida | Linyphiidae | C |
| Agyneta protrudens | Dwarf black Linyphiid spider | Arachnida | Linyphiidae | C |
| Arcuphantes sylvaticus | Dwarf spider | Arachnida | Linyphiidae | C |
| Bathyphantes pallidus | Dwarf spider | Arachnida | Linyphiidae | C |
| Bathyphantes waneta | Waneta Shield Sheetweaver | Arachnida | Linyphiidae | P |
| Centromerus longibulbus | Dwarf spider | Arachnida | Linyphiidae | P |
| Ceraticelus atriceps | Dwarf spider | Arachnida | Linyphiidae | P |
| Ceraticelus fissiceps | Dwarf spider | Arachnida | Linyphiidae | P |
| Collinsia ksenia | Dwarf spider | Arachnida | Linyphiidae | TBD |
| Coloncus siou | Dwarf spider | Arachnida | Linyphiidae | TBD |
| Coreorgonal petulcus | Dwarf spider | Arachnida | Linyphiidae | TBD |
| Diplostyla concolor | Dwarf spider | Arachnida | Linyphiidae | P |
| Erigone aletris | Black dwarf spider | Arachnida | Linyphiidae | P |
| Erigone blaesa | Blazed Dwarf Weaver | Arachnida | Linyphiidae | P |
| Erigone dentosa | Hook-toothed Money Spider | Arachnida | Linyphiidae | P |
| Frontinella pyramitela | Bowl-and-doily Spider | Arachnida | Linyphiidae | P |
| Glyphesis idahoanus | Dwarf spider | Arachnida | Linyphiidae | TBD |
| Helophora reducta | Dwarf spider | Arachnida | Linyphiidae | P |
| Helophora tunagyna | Dwarf spider | Arachnida | Linyphiidae | P |
| Incestophantes lamprus | Dwarf spider | Arachnida | Linyphiidae | TBD |
| Incestophantes washingtoni | Washington Sheet-web Weaver | Arachnida | Linyphiidae | TBD |
| Lepthyphantes intricatus | Dwarf spider | Arachnida | Linyphiidae | P |
| Lepthyphantes leprosus | Household Fine Sheetweaver | Arachnida | Linyphiidae | P |
| Linyphantes aeronauticus | Dwarf spider | Arachnida | Linyphiidae | P |
| Mermessus trilobatus | Trilobate Dwarf Weaver | Arachnida | Linyphiidae | C |
| Neriene digna | Sheetweb spider | Arachnida | Linyphiidae | P |
| Neriene litigiosa | Sierra Dome Spider | Arachnida | Linyphiidae | P |
| Neriene radiata | Filmy Dome Spider | Arachnida | Linyphiidae | C |
| Pityohyphantes alticeps | Sheetweb spider | Arachnida | Linyphiidae | P |
| Pityohyphantes costatus | Hammock Spider | Arachnida | Linyphiidae | P |
| Pityohyphantes cristatus | Sheetweb spider | Arachnida | Linyphiidae | P |
| Pocadicnemis americana | Sheetweb spider | Arachnida | Linyphiidae | P |
| Pocadicnemis pumila | Sheetweb spider | Arachnida | Linyphiidae | P |
| Scotinotylus ambiguus | Sheetweb spider | Arachnida | Linyphiidae | P |
| Scotinotylus bicavatus | Sheetweb spider | Arachnida | Linyphiidae | TBD |
| Sougambus bostoniensis | Sheetweb spider | Arachnida | Linyphiidae | P |
| Spirembolus monticolens | Sheetweb spider | Arachnida | Linyphiidae | P |
| Spirembolus prominens | Sheetweb spider | Arachnida | Linyphiidae | P |
| Symmigma minimum | Sheetweb spider | Arachnida | Linyphiidae | C |
| Tenuiphantes tenuis | Sheetweb spider | Arachnida | Linyphiidae | P |
| Tenuiphantes zebra | Sheetweb spider | Arachnida | Linyphiidae | C |
| Tenuiphantes zelatus | Sheetweb spider | Arachnida | Linyphiidae | TBD |
| Walckenaeria communis | Sheetweb spider | Arachnida | Linyphiidae | P |
| Walckenaeria tricornis | Sheetweb spider | Arachnida | Linyphiidae | TBD |
| Wubana ornata | Sheetweb spider | Arachnida | Linyphiidae | P |
| Agroeca ornata | Liocranid sac spider | Arachnida | Liocranidae | P |
| Agroeca pratensis | Liocranid sac spider | Arachnida | Liocranidae | P |
| Apostenus ducati | Liocranid sac spider | Arachnida | Liocranidae | C |
| Alopecosa aculeata | Fox spider | Arachnida | Lycosidae | C |
| Alopecosa kochi | Koch's Wolf Spider | Arachnida | Lycosidae | P |
| Arctosa emertoni | Emerton's Wolf Spider | Arachnida | Lycosidae | P |
| Arctosa littoralis | Shoreline Wolf Spider | Arachnida | Lycosidae | P |
| Hogna frondicola | Forest Wolf Spider | Arachnida | Lycosidae | C |
| Pardosa altamontis | Thin-legged wolf spider | Arachnida | Lycosidae | P |
| Pardosa anomala | Thin-legged wolf spider | Arachnida | Lycosidae | P |
| Pardosa buckleyi | Thin-legged wolf spider | Arachnida | Lycosidae | P |
| Pardosa coloradensis | Thin-legged wolf spider | Arachnida | Lycosidae | P |
| Pardosa concinna | Thin-legged wolf spider | Arachnida | Lycosidae | TBD |
| Pardosa dorsalis | Thin-legged wolf spider | Arachnida | Lycosidae | P |
| Pardosa dorsuncata | Thin-legged wolf spider | Arachnida | Lycosidae | P |
| Pardosa fuscula | Thin-legged wolf spider | Arachnida | Lycosidae | P |
| Pardosa groenlandica | Groenland Wolf Spider | Arachnida | Lycosidae | C |
| Pardosa lowriei | Thin-legged wolf spider | Arachnida | Lycosidae | TBD |
| Pardosa mackenziana | Mackenzie's Thin-legged Wolf Spider | Arachnida | Lycosidae | P |
| Pardosa moesta | Shiny Wolf Spider | Arachnida | Lycosidae | TBD |
| Pardosa ontariensis | Thin-legged wolf spider | Arachnida | Lycosidae | C |
| Pardosa wyuta | Thin-legged wolf spider | Arachnida | Lycosidae | C |
| Pardosa xerampelina | Thin-legged wolf spider | Arachnida | Lycosidae | P |
| Pirata piraticus | Pirate Otter Spider | Arachnida | Lycosidae | P |
| Schizocosa mccooki | Brush-legged spider | Arachnida | Lycosidae | P |
| Schizocosa minnesotensus | Brush-legged spider | Arachnida | Lycosidae | P |
| Trochosa ruricola | Rustic Wolf Spider | Arachnida | Lycosidae | P |
| Trochosa terricola | Ground Wolf Spider | Arachnida | Lycosidae | C |
| Mimetus hesperus | Western Pirate Spider | Arachnida | Mimetidae | C |
| Oxyopes scalaris | Western Lynx Spider | Arachnida | Oxyopidae | C |
| Apollophanes margareta | Running crab spider | Arachnida | Philodromidae | C |
| Ebo evansae | Evans's Running Crab Spider | Arachnida | Philodromidae | TBD |
| Philodromus californicus | Running crab spider | Arachnida | Philodromidae | P |
| Philodromus cespitum | Turf Running Spider | Arachnida | Philodromidae | C |
| Philodromus dispar | Eurasian Running Crab Spider | Arachnida | Philodromidae | C |
| Philodromus insperatus | Running crab spider | Arachnida | Philodromidae | P |
| Philodromus oneida | Running crab spider | Arachnida | Philodromidae | P |
| Philodromus pernix | Running crab spider | Arachnida | Philodromidae | P |
| Philodromus praelustris | Running crab spider | Arachnida | Philodromidae | P |
| Philodromus rodecki | Running crab spider | Arachnida | Philodromidae | P |
| Philodromus rufus | White-striped Running Crab Spider | Arachnida | Philodromidae | C |
| Philodromus speciosus | Running crab spider | Arachnida | Philodromidae | P |
| Philodromus spectabilis | Running crab spider | Arachnida | Philodromidae | P |
| Rhysodromus alascensis | Running crab spider | Arachnida | Philodromidae | P |
| Rhysodromus histrio | Attractive Running Crab Spider | Arachnida | Philodromidae | C |
| Thanatus altimontis | Running crab spider | Arachnida | Philodromidae | TBD |
| Thanatus coloradensis | Running crab spider | Arachnida | Philodromidae | P |
| Thanatus formicinus | False crab spider | Arachnida | Philodromidae | P |
| Thanatus striatus | Five-striped Spider | Arachnida | Philodromidae | P |
| Tibellus asiaticus | Slender crab spider | Arachnida | Philodromidae | TBD |
| Tibellus chamberlini | Slender crab spider | Arachnida | Philodromidae | P |
| Tibellus maritimus | Slender crab spider | Arachnida | Philodromidae | P |
| Tibellus oblongus | Oblong Running Spider | Arachnida | Philodromidae | C |
| Pholcophora americana | American Cellar Spider | Arachnida | Pholcidae | C |
| Pholcus opilionoides | Cellar spider | Arachnida | Pholcidae | C |
| Pholcus phalangioides | Long-bodied Cellar Spider | Arachnida | Pholcidae | C |
| Psilochorus hesperus | Pholcid spider | Arachnida | Pholcidae | P |
| Zygiella x-notata | Silver-sided Sector Spider | Arachnida | Phonognathidae | TBD |
| Phrurotimpus borealis | Greater Ant-Mimic Corinne Spider | Arachnida | Phrurolithidae | P |
| Phrurotimpus certus | Lesser Ant-Mimic Corinne Spider | Arachnida | Phrurolithidae | P |
| Scotinella pugnata | Phrurolithid spider | Arachnida | Phrurolithidae | P |
| Pimoa haden | Pimoid spider | Arachnida | Pimoidae | P |
| Dolomedes triton | Six-spotted Fishing Spider | Arachnida | Pisauridae | C |
| Attinella dorsata | Elongated Patterned Jumping Spider | Arachnida | Salticidae | P |
| Attulus ammophilus | Jumping spider | Arachnida | Salticidae | C |
| Attulus fasciger | Asiatic Wall Jumping Spider | Arachnida | Salticidae | TBD |
| Attulus finschi | Jumping spider | Arachnida | Salticidae | P |
| Attulus floricola | Flower Jumping Spider | Arachnida | Salticidae | P |
| Dendryphantes nigromaculatus | Black-marked Jumping Spider | Arachnida | Salticidae | P |
| Eris militaris | Bronze Jumping Spider | Arachnida | Salticidae | C |
| Evarcha proszynskii | Proszynski's Jumping Spider | Arachnida | Salticidae | C |
| Habronattus americanus | Jumping spider | Arachnida | Salticidae | P |
| Habronattus decorus | Jumping spider | Arachnida | Salticidae | C |
| Habronattus hirsutus | Hirsute Paradise Spider | Arachnida | Salticidae | C |
| Habronattus oregonensis | Oregon Paradise Spider | Arachnida | Salticidae | P |
| Habronattus sansoni | Jumping spider | Arachnida | Salticidae | C |
| Neon pixii | Jumping spider | Arachnida | Salticidae | P |
| Neon reticulatus | Jumping spider | Arachnida | Salticidae | P |
| Pelegrina aeneola | Coppered White-cheeked Jumping Spider | Arachnida | Salticidae | P |
| Pelegrina balia | White-cheeked jumping spider | Arachnida | Salticidae | C |
| Pelegrina clemata | White-cheeked jumping spider | Arachnida | Salticidae | TBD |
| Pelegrina flavipes | White-cheeked jumping spider | Arachnida | Salticidae | TBD |
| Pelegrina helenae | White-cheeked jumping spider | Arachnida | Salticidae | P |
| Pelegrina montana | White-cheeked jumping spider | Arachnida | Salticidae | P |
| Pelegrina proterva | Common White-cheeked Jumping Spider | Arachnida | Salticidae | P |
| Pellenes lapponicus | Jumping spider | Arachnida | Salticidae | P |
| Phanias concoloratus | Jumping spider | Arachnida | Salticidae | C |
| Phidippus borealis | Boreal Tufted Jumping Spider | Arachnida | Salticidae | P |
| Phidippus johnsoni | Johnson's Jumping Spider | Arachnida | Salticidae | C |
| Phidippus purpuratus | Marbled Purple Jumping Spider | Arachnida | Salticidae | C |
| Platycryptus californicus | California Flattened Jumping Spider | Arachnida | Salticidae | C |
| Salticus scenicus | Zebra Jumping Spider | Arachnida | Salticidae | C |
| Sassacus papenhoei | Common Leaf-beetle Jumping Spider | Arachnida | Salticidae | P |
| Sassacus vitis | Buttonhook Leaf-beatle Jumping Spider | Arachnida | Salticidae | P |
| Sittisax ranieri | Ranier's Patterned Jumping Spider | Arachnida | Salticidae | TBD |
| Synageles leechi | Jumping spider | Arachnida | Salticidae | TBD |
| Synageles occidentalis | Jumping spider | Arachnida | Salticidae | TBD |
| Talavera minuta | Minute Jumping Spider | Arachnida | Salticidae | P |
| Tutelina similis | Thick-spined Jumping Spider | Arachnida | Salticidae | P |
| Usofila pacifica | American long-legged cave spider | Arachnida | Telemidae | P |
| Metellina mimetoides | Long-jawed orb weaver | Arachnida | Tetragnathidae | C |
| Tetragnatha extensa | Common Stretch Spider | Arachnida | Tetragnathidae | P |
| Tetragnatha laboriosa | Silver Long-jawed Orb Weaver | Arachnida | Tetragnathidae | P |
| Tetragnatha versicolor | Versicolor Long-jawed Orb Weaver | Arachnida | Tetragnathidae | C |
| Asagena americana | Two-spotted Cobweb Spider | Arachnida | Theridiidae | C |
| Cryptachaea canionis | Cobweb spider | Arachnida | Theridiidae | P |
| Dipoena nigra | Cobweb spider | Arachnida | Theridiidae | P |
| Enoplognatha intrepida | Cobweb spider | Arachnida | Theridiidae | TBD |
| Enoplognatha latimana | Scarce Candy-striped Spider | Arachnida | Theridiidae | C |
| Enoplognatha marmorata | Marbled Cobweb Spider | Arachnida | Theridiidae | P |
| Enoplognatha ovata | Common Candy-striped Spider | Arachnida | Theridiidae | C |
| Enoplognatha wyuta | Candy-striped spider | Arachnida | Theridiidae | C |
| Euryopis formosa | Inland Triangular Cobweaver | Arachnida | Theridiidae | P |
| Euryopis funebris | Eastern Triangular Cobweaver | Arachnida | Theridiidae | C |
| Euryopis scriptipes | Cobweb spider | Arachnida | Theridiidae | C |
| Latrodectus hesperus | Western Black Widow | Arachnida | Theridiidae | C |
| Neottiura bimaculata | Cobweb spider | Arachnida | Theridiidae | P |
| Parasteatoda tepidariorum | Common House Spider | Arachnida | Theridiidae | C |
| Steatoda albomaculata | White-spotted False Widow | Arachnida | Theridiidae | P |
| Steatoda bipunctata | Rabbit Hutch Spider | Arachnida | Theridiidae | TBD |
| Steatoda borealis | Boreal Combfoot | Arachnida | Theridiidae | P |
| Steatoda grossa | False Black Widow | Arachnida | Theridiidae | C |
| Steatoda hespera | False widow spider | Arachnida | Theridiidae | P |
| Steatoda triangulosa | Triangulate Combfoot Spider | Arachnida | Theridiidae | C |
| Steatoda washona | False widow spider | Arachnida | Theridiidae | P |
| Theridion differens | Cobweb spider | Arachnida | Theridiidae | C |
| Theridion leechi | Cobweb spider | Arachnida | Theridiidae | P |
| Theridion murarium | Fence Long-legged Cobweaver | Arachnida | Theridiidae | C |
| Theridion neomexicanum | Cobweb spider | Arachnida | Theridiidae | P |
| Theridion petraeum | Cobweb spider | Arachnida | Theridiidae | P |
| Theridion rabuni | Cobweb spider | Arachnida | Theridiidae | P |
| Theridula emertoni | Emerson's Bitubercled Cobweaver | Arachnida | Theridiidae | P |
| Thymoites camano | Comb-footed spider | Arachnida | Theridiidae | C |
| Bassaniana utahensis | Utah Crab Spider | Arachnida | Thomisidae | C |
| Coriarachne brunneipes | Brown-legged Crab Spider | Arachnida | Thomisidae | TBD |
| Mecaphesa asperata | Northern Crab Spider | Arachnida | Thomisidae | C |
| Mecaphesa celer | Swift Crab Spider | Arachnida | Thomisidae | P |
| Misumena vatia | Goldenrod Crab Spider | Arachnida | Thomisidae | C |
| Xysticus benefactor | Ground crab spider | Arachnida | Thomisidae | P |
| Xysticus cunctator | Ground crab spider | Arachnida | Thomisidae | P |
| Xysticus discurscans | Ground crab spider | Arachnida | Thomisidae | P |
| Xysticus elegans | Ground crab spider | Arachnida | Thomisidae | C |
| Xysticus emertoni | Emerton's Crab Spider | Arachnida | Thomisidae | P |
| Xysticus ferox | Tan Crab Spider | Arachnida | Thomisidae | P |
| Xysticus gulosus | Ground crab spider | Arachnida | Thomisidae | P |
| Xysticus locuples | Ground crab spider | Arachnida | Thomisidae | P |
| Xysticus luctuosus | Ground crab spider | Arachnida | Thomisidae | TBD |
| Xysticus montanensis | Montane Crab Spider | Arachnida | Thomisidae | P |
| Xysticus pretiosus | Ground crab spider | Arachnida | Thomisidae | TBD |
| Titanoeca nigrella | Titanoecid spider | Arachnida | Titanoecidae | P |
| Titanoeca nivalis | Titanoecid spider | Arachnida | Titanoecidae | P |
| Meriola decepta | Trachelid spider | Arachnida | Trachelidae | TBD |
| Hyptiotes gertschi | Gertsch's Triangleweaver | Arachnida | Uloboridae | C |
| Uloborus glomosus | Featherlegged Orbweaver | Arachnida | Uloboridae | TBD |