Spider data & statistics
Public-health and biodiversity datasets relevant to spiders in the United States - each linked to its primary source.
- Data
Spider bite statistics (United States)
Aggregated public-health data on verified spider bites in the United States, drawn from the American Association of Poison Control Centers National Poison Data System (NPDS).
- Data
Spider species richness by state
Documented species counts per US state aggregate from state extension publications and museum records. Counts vary widely with sampling effort, not just true biodiversity.
- Data
Medically significant spiders in the US
Only two genera in the United States produce envenomation of significant clinical consequence: Latrodectus (widows) and Loxosceles (recluses).
- Data
Verified Loxosceles range (United States)
Established populations of native Loxosceles species in the United States, based on museum specimens and verified field collections compiled by Vetter and collaborators.
- Data
Latrodectus species distribution (United States)
Native Latrodectus species occupy distinct overlapping ranges across the United States: L. mactans (southeast), L. variolus (northeast), L. hesperus (west), L. bishopi (central Florida), plus the introduced and now widespread L. geometricus.
- Data
Seasonality of indoor spider encounters
Indoor sightings of large synanthropic spiders peak in late summer and early autumn in most US regions, driven primarily by male search activity rather than population growth.
- Data
Poison control call trends (United States)
AAPCC NPDS data show a steady ~3,500–4,500 annual calls coded for spider exposure across the past decade, with the majority classified as minor and fatalities essentially absent in recent reporting years.