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Invasive
Noble False Widow
Steatoda nobilis
18,523 observations
Bold Jumping Spider
Phidippus audax
13,054 observations
Western Black Widow
Latrodectus hesperus
11,392 observations
Brown Widow
Latrodectus geometricus
10,530 observations
Johnson's Jumping Spider
Phidippus johnsoni
9,158 observations
Silver Garden Orbweaver
Argiope argentata
7,771 observations
Koch's Wolf Spider
Alopecosa kochi
6,502 observations
False Black Widow
Steatoda grossa
5,956 observations
Cross Orbweaver
Araneus diadematus
5,934 observations
Western Forest Scorpion
Uroctonus mordax
5,520 observations
Long-bodied Cellar Spider
Pholcus phalangioides
5,445 observations
Western Spotted Orbweaver
Neoscona oaxacensis
5,434 observations
Invasive
Half-edged Wall Jumping Spider
Menemerus semilimbatus
5,157 observations
Buttonhook Leafbeetle Jumping Spider
Sassacus vitis
4,964 observations
Woodlouse Spider
Dysdera crocata
4,944 observations
Colonus hesperus
Colonus hesperus
4,717 observations
Spotted Orbweaver
Neoscona crucifera
4,539 observations
Marbled Cellar Spider
Holocnemus pluchei
4,213 observations
Western Lynx Spider
Oxyopes scalaris
4,113 observations
Pacific Coast Tick
Dermacentor occidentalis
3,996 observations
Banded Garden Spider
Argiope trifasciata
3,858 observations
California Red Jumping Spider
Phidippus adumbratus
3,596 observations
Green Lynx Spider
Peucetia viridans
3,336 observations
Habronattus pyrrithrix
Habronattus pyrrithrix
3,275 observations
Grey House Spider
Badumna longinqua
3,115 observations
Gray Wall Jumping Spider
Menemerus bivittatus
3,038 observations
California Turret Spider
Atypoides riversi
2,776 observations
Yellow Garden Spider
Argiope aurantia
2,632 observations
Desert Tarantula
Aphonopelma iodius
2,593 observations
California common scorpion
Paruroctonus silvestrii
2,491 observations
Western Black-legged Tick
Ixodes pacificus
2,377 observations
Invasive
Mediterranean Spiny False Wolf Spider
Zoropsis spinimana
1,883 observations
Goldenrod Crab Spider
Misumena vatia
1,870 observations
False Tarantula
Calisoga longitarsis
1,692 observations
Live Oak Erineum Mite
Aceria mackiei
1,588 observations
Ribbon Jumping Spider
Metacyrba taeniola
1,561 observations
South American Toothed Hacklemesh Weaver
Metaltella simoni
1,557 observations
Paravaejovis puritanus
Paravaejovis puritanus
1,507 observations
Striped Lynx Spider
Oxyopes salticus
1,462 observations
California Swollenstinger Scorpion
Anuroctonus pococki
1,409 observations
Western Parson Spider
Herpyllus propinquus
1,383 observations
Zebra Jumping Spider
Salticus scenicus
1,354 observations
Steindachner's Ebony Tarantula
Aphonopelma steindachneri
1,294 observations
California Ebony Tarantula
Aphonopelma eutylenum
1,274 observations
California Trapdoor Spider
Bothriocyrtum californicum
1,085 observations
American Dog Tick
Dermacentor variabilis
1,082 observations
Dune Scorpion
Smeringurus mesaensis
1,057 observations
Sawfinger Scorpion
Serradigitus gertschi
1,032 observations
Mule Fat Blister Mite
Aceria baccharices
1,018 observations
Six-spotted Orbweaver
Araniella displicata
997 observations
Frequently Asked Questions
- The 10 most common arachnids in California are:
- Noble False Widow (Steatoda nobilis)
- Bold Jumping Spider (Phidippus audax)
- Western Black Widow (Latrodectus hesperus)
- Brown Widow (Latrodectus geometricus)
- Johnson's Jumping Spider (Phidippus johnsoni)
- Silver Garden Orbweaver (Argiope argentata)
- Koch's Wolf Spider (Alopecosa kochi)
- False Black Widow (Steatoda grossa)
- Cross Orbweaver (Araneus diadematus)
- Western Forest Scorpion (Uroctonus mordax)
- The most observed arachnid in California is Noble False Widow (Steatoda nobilis), with 18,523 recorded observations.
- Some of the most commonly observed invasive arachnids in California include:
- Noble False Widow (Steatoda nobilis)
- Half-edged Wall Jumping Spider (Menemerus semilimbatus)
- Mediterranean Spiny False Wolf Spider (Zoropsis spinimana)