Theraphosid (Tarantula) Bite Envenomation in Humans: A Systematic Review of the Reported Epidemiology

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Theraphosid (Tarantula) Bite Envenomation in Humans: A Systematic Review of the Reported Epidemiology

ABSTRACT

Background

Despite the ubiquity of Theraphosidae (tarantulas) in the pet trade, the clinical literature on theraphosid envenomation is heterogeneous, geographically uneven, dominated by selective self-report, and frequently obscured by taxonomic misidentification.

Methods

PubMed/MEDLINE and supplementary sources were screened against pre-specified criteria for published reports of human theraphosid bites (PRISMA).

Results

Forty-two reports (1889–2026) entered the primary synthesis: 39 were localizable to 17 countries, one did not state the bite country, and two were international hobbyist compilations. Reporting concentrated in South Asia, in captive-keeper bites in Europe and North America, and in Australia. Among Old World species (native to Africa, Asia, and Australasia), African, South Asian, and Southeast Asian lineages were repeatedly associated with intense local pain, delayed generalized muscle cramping, creatine kinase elevation, and, rarely, transient atrial fibrillation, whereas Australian bites caused severe local pain without cramping. New World bites (species native to the Americas) predominantly produced minor local effects, with rare systemic exceptions (suspected anaphylaxis, prolonged cramping, thrombocytopenia). Only 8 of 42 reports had identification by a named arachnologist, zoologist, or institutional laboratory. No validated antivenom and no death attributable to a verified Theraphosidae bite were identified; two deaths attributed to the genus Chilobrachys in a 1997 Indian report lack documented taxonomic and causal confirmation.

Conclusions

Most reported theraphosid bites were minor, but the literature cannot estimate population-level risk without defined denominators. Some Old World bites were high-acuity events, and the literature has emphasized less heterogeneity in Old World envenomations than exists. Priorities include standardized species identification, prospective registries, and consistent severity reporting.

Alexander, D. D. (2026). Theraphosid (Tarantula) Bite Envenomation in Humans: A Systematic Review of the Reported Epidemiology. Toxicon, 109358. https://doi.org/10.1016/j.toxicon.2026.109358