False Widow Spiders Confirmed in Porirua, Public Asked to Report Sightings
Kiwis are being urged to keep an eye out for false widow spiders, after a confirmed sighting in Porirua and growing reports across Aotearoa. The species, known for its venomous bite, could pose risks to health and local biodiversity.
What’s Happening?
A recent iNaturalist NZ report confirmed the presence of Steatoda nobilis, or the false widow spider, in Porirua. Native to Madeira and the Canary Islands, this invasive species has been spreading rapidly through parts of the UK and Ireland—and now appears to be establishing itself in New Zealand.
Who’s Involved?
The alert comes from entomologists and researchers, including Professor Steven Trewick from Massey University, who warns that false widow spider bites can occasionally lead to antibiotic-resistant infections. While most bites are mild, some have caused serious skin conditions in overseas cases.
Where and When?
Confirmed sightings have been reported in Porirua, with possible expansion to other regions including Wellington, Christchurch, Nelson, Northland, and Waikato. Experts suspect the species has been here longer than initially thought, but warmer urban environments may be accelerating its spread.
Why It Matters to Locals
Unlike NZ’s native spiders, this urban-dwelling species can thrive near homes and buildings, increasing the chances of human contact. While not aggressive, its presence raises questions around venomous spiders in NZ, and what this means for pets, children, and biodiversity.
Local Angle / Impact:
This is not just a curiosity—it could become a public health issue. The false widow spider is not deadly, but it’s one of the few spiders in New Zealand with a medically significant bite. Locals are being asked to upload suspected sightings to the iNaturalist NZ platform to help map its spread and inform future containment strategies.
Think you’ve spotted one?
Check NZ spider identification tips at iNaturalist NZ and upload a clear photo if possible.
Avoid handling unknown spiders directly
Take note of location and environment
Report via the iNaturalist app or website
