Are There Spiders in New Zealand? a Clear Guide to the Spiders of Aotearoa

New Zealand's Unique Spider Fauna

New Zealand is home to a rich and diverse spider fauna, with many species unique to the country. While some readers fear spiders, most NZ species are harmless to humans and play important roles in ecosystems as predators of insects and other small arthropods. This article provides a concise overview of what you can expect to find, where to look, and how to distinguish common NZ spiders from those that warrant caution.

What Kinds of Spiders Live in New Zealand?

• Endemic diversity: About 90% of NZ spiders are endemic, meaning they are found nowhere else on Earth. This high level of endemism reflects New Zealand’s long geographic isolation and varied habitats. Endemic groups include sheetweb spiders, jumping spiders, and several large ground-dwelling species.^[1] This unique biodiversity is a result of millions of years of evolution in isolation, allowing species to adapt to specific ecological niches.

• Commonly encountered groups: You’ll often encounter sheetweb spiders (Cambridgea spp.), jumping spiders (family Salticidae), cathedral spiders, villa spiders, and various tarantula-like ground spiders. These species occupy forests, gardens, and coastal live habitats across both islands.^[3][1] Their adaptability allows them to thrive in various environments, making them a common sight in both rural and urban areas.

• Notable large species: The Nelson cave spider (Spelungula cavernicola) is famous for one of the largest leg spans among NZ spiders and is typically found in limestone caves in the northern parts of the South Island.^[1] This spider's size and unique habitat make it a subject of interest for researchers and enthusiasts alike.

Are Nz Spiders Dangerous to People?

• Most are not dangerous: The vast majority of New Zealand spiders have venom that is not harmful to humans, and bites are rare and typically mild if they occur. The country’s most well-known venomous spider, the katipo, can bite, but encounters are uncommon and bites are rarely serious.^[5] Understanding the behavior of these spiders can help alleviate fears and promote coexistence.

• Katipo caution: The katipo spider is a small, distinctive black spider with a red stripe on the back; bites are uncommon and you are unlikely to encounter one in everyday life. If you do see a katipo in coastal or driftwood areas, avoid handling it.^[5] Awareness of its appearance and habitat can help prevent unnecessary panic.

Where in New Zealand Are Spiders Commonly Found?

• Habitats: Spiders in NZ inhabit native forests, gardens, coastal dunes, and rock or log piles. They are adaptable and can thrive in suburban settings, especially species that build leaf litter or bark retreats.^[3] This versatility allows them to occupy a wide range of ecological niches, contributing to the overall health of these environments.

• Seasonal activity: Many NZ spiders are more visible during warmer months, but indoor sightings occur year-round, particularly for species that tolerate human-made structures.^[3] Seasonal changes can influence spider behavior and visibility, making certain times of the year more favorable for observing them.

How to Identify Some Familiar Nz Spiders

• Jumping spiders (Salticidae): Small to medium-sized with distinctive large eyes. They are often colorful and famous for agile leaps while hunting prey.^[3] Their unique hunting technique and appearance make them a favorite among spider watchers.

• Katipo (Latrodectus katipo): A venomous form in the genus Latrodectus, usually black with a red stripe and sometimes a red hourglass underside. They make small ground-level retreats near coastal vegetation.^[5] Recognizing this spider is crucial for safety, especially in coastal areas.

• Black tunnelweb (Porrhothele antipodiana): Large, dark-bodied spider that often hides in silken tunnels or burrows under logs and rocks. They are not aggressive but can cause a painful bite if mishandled.^[7] Understanding their behavior can help mitigate the risk of bites.

• Nelson cave spider (Spelungula cavernicola): One of NZ’s largest spiders by leg span, found in cave environments in the northern South Island.^[1] Its unique habitat and size make it an important species for ecological studies.

• Avondale spider (Delena cancerides): A huntsman species that is nocturnal and often found under bark or in sheltered outdoor spots.^[5] Their nocturnal habits make them less visible during the day, contributing to their mysterious reputation.

What to Do If You See a Spider

• Do not panic: Spiders play a beneficial role by controlling insect populations. Most NZ spiders leave people alone if left undisturbed.^[1] Understanding their ecological role can help reduce fear and promote a more harmonious coexistence.

• For bites: If bitten, wash the area with soap and water, and apply a cold compress to reduce swelling. Seek medical advice if you experience severe pain, swelling, or signs of an allergic reaction.^[5] Knowing how to respond to bites can help ensure your safety and well-being.

• If you’re unsure: When in doubt, observe from a distance and avoid handling. If you’re in a region with coastal dunes or cave systems, you may encounter unique species not commonly seen elsewhere.^[3] Observing spiders from afar can provide valuable insights into their behavior without risking harm.

Why Nz Spiders Are Worth Knowing

• Biodiversity and ecosystems: Spiders help regulate insect numbers, contributing to forest health and garden balance. The high proportion of endemic species highlights New Zealand’s unique evolutionary history.^[1] Understanding this biodiversity is crucial for conservation efforts.

• Cultural and educational value: Local museums, zoos, and citizen science programs offer opportunities to learn about and observe NZ spiders safely and responsibly.^[3] Engaging with these resources can enhance public knowledge and appreciation of these fascinating creatures.

Illustration: A Quick Reference Guide

• Look for distinctive features:

  • Eye arrangement for jumping spiders
  • A red dorsal stripe for katipo
  • Burrow structures for tunnelweavers

• Note habitat clues:

  • Coastal driftwood for katipo
  • Forest understory for sheetwebs
  • Caves for Nelson cave spiders

• Exercise caution: Near coastal areas where venomous species may be found, and always avoid handling unfamiliar spiders.

Key Takeaways

• Yes, spiders are plentiful in New Zealand, with many species unique to the country.^[1]
• Most species are harmless to humans, though a few, like the katipo, warrant respect and caution.^[5]
• Observing spiders in their natural habitats supports conservation and appreciation of NZ’s biodiversity.^[3]

Sources

• Spiders of New Zealand, Wikipedia.^[1]
• Te Papa’s blog on New Zealand spiders.^[3]
• Total Pest Control NZ spider identification chart.^[7]