Spider species
Each profile documents scientific name, family, female and male body length, leg span, lifespan, web type, eye arrangement, egg-sac data, geographic range, identifying features, and primary-source citations.
Brown Recluse
Medically significantLoxosceles reclusa
Sicariidae · 16 states
Southern Black Widow
Medically significantLatrodectus mactans
Theridiidae · 23 states
Western Black Widow
Medically significantLatrodectus hesperus
Theridiidae · 17 states
Brown Widow
ModerateLatrodectus geometricus
Theridiidae · 12 states
Hobo Spider
LowEratigena agrestis
Agelenidae · 7 states
Yellow Sac Spider
ModerateCheiracanthium inclusum
Cheiracanthiidae · 1 states
Joro Spider
Not medically significantTrichonephila clavata
Araneidae · 8 states
Northern Black Widow
Medically significantLatrodectus variolus
Theridiidae · 18 states
Red Widow
Medically significantLatrodectus bishopi
Theridiidae · 1 states
Common House Spider
LowParasteatoda tepidariorum
Theridiidae · 1 states
Wolf Spider
LowLycosidae (family overview)
Lycosidae · 1 states
Cellar Spider
Not medically significantPholcus phalangioides
Pholcidae · 1 states
Bold Jumping Spider
LowPhidippus audax
Salticidae · 1 states
Yellow Garden Spider
Not medically significantArgiope aurantia
Araneidae · 1 states
Golden Silk Orb Weaver
LowTrichonephila clavipes
Araneidae · 8 states
Grass Spider
Not medically significantAgelenopsis spp.
Agelenidae · 1 states
Southern House Spider
LowKukulcania hibernalis
Filistatidae · 11 states
Giant House Spider
Not medically significantEratigena atrica
Agelenidae · 3 states
Chilean Recluse
Medically significantLoxosceles laeta
Sicariidae · 1 states
| Common name | Scientific | Family | ♀ body (mm) | Range | Medical |
|---|---|---|---|---|---|
| Brown Recluse | Loxosceles reclusa | Sicariidae | 7–12 | 16 states | Medically significant |
| Southern Black Widow | Latrodectus mactans | Theridiidae | 8–13 | 23 states | Medically significant |
| Western Black Widow | Latrodectus hesperus | Theridiidae | 8–16 | 17 states | Medically significant |
| Brown Widow | Latrodectus geometricus | Theridiidae | 7–12 | 12 states | Moderate |
| Hobo Spider | Eratigena agrestis | Agelenidae | 11–15 | 7 states | Low |
| Yellow Sac Spider | Cheiracanthium inclusum | Cheiracanthiidae | 5–10 | 1 states | Moderate |
| Joro Spider | Trichonephila clavata | Araneidae | 17–25 | 8 states | Not medically significant |
| Northern Black Widow | Latrodectus variolus | Theridiidae | 9–11 | 18 states | Medically significant |
| Red Widow | Latrodectus bishopi | Theridiidae | 9–13 | 1 states | Medically significant |
| Common House Spider | Parasteatoda tepidariorum | Theridiidae | 5–8 | 1 states | Low |
| Wolf Spider | Lycosidae (family overview) | Lycosidae | 10–35 | 1 states | Low |
| Cellar Spider | Pholcus phalangioides | Pholcidae | 7–10 | 1 states | Not medically significant |
| Bold Jumping Spider | Phidippus audax | Salticidae | 8–15 | 1 states | Low |
| Yellow Garden Spider | Argiope aurantia | Araneidae | 19–28 | 1 states | Not medically significant |
| Golden Silk Orb Weaver | Trichonephila clavipes | Araneidae | 22–40 | 8 states | Low |
| Grass Spider | Agelenopsis spp. | Agelenidae | 10–20 | 1 states | Not medically significant |
| Southern House Spider | Kukulcania hibernalis | Filistatidae | 13–19 | 11 states | Low |
| Giant House Spider | Eratigena atrica | Agelenidae | 11–18 | 3 states | Not medically significant |
| Chilean Recluse | Loxosceles laeta | Sicariidae | 8–15 | 1 states | Medically significant |