Funnel-Web or Trapdoor Spider? How to Tell the Difference

What Is the Difference Between Funnel Web Spiders and Trapdoor Spiders in Sydney?

Both the Sydney Funnel-web Spider (Atrax robustus) and the Sydney Brown Trapdoor Spider (Arbanitis villosus) are classified as mygalomorph ground spiders. Unlike web-building species, they live most of their lives in silk-lined underground burrows and hunt at night without constructing aerial webs.

According to the Australian Museum, these two species are the most commonly misidentified large spiders in the Sydney Basin. Around 70% of public reports of “deadly funnel-webs” received by wildlife services are actually harmless trapdoor spiders, a misidentification that causes unnecessary alarm and can also lead to dangerous complacency when a real funnel-web is dismissed as safe.

Ground spiders of both species are found under bark, rocks, logs, and garden debris across Greater Sydney. They only leave their burrows to hunt, seek a mate, or move to higher ground during heavy rain and flood events — a frequent occurrence in Sydney’s storm season from November to March.

For a full home inspection and spider identification, Contact Sydney’s Best Pest Control.

How Can I Tell a Funnel Web and Trapdoor Spider Apart by Appearance?

Side-by-Side Appearance Comparison

Feature	Sydney Funnel-web Spider	Sydney Brown Trapdoor Spider
Cephalothorax (front body)	Hairless, smooth, glossy jet black	Matte, dusty look, covered in fine golden-brown hairs
Abdomen	Black, deep brown, or sometimes purple	Brown to dark brown, often with faint greyish bars
Body & legs	Male: slender legs, ~20 mm body length; Female: stockier, ~30 mm	Stocky, stout body and legs; both sexes 15–30 mm
Male mating spur	Single prominent spur on the second pair of legs	Small double spur halfway along the first pair of legs
Spinnerets (rear silk organs)	Long, finger-like, clearly visible from above	Short, blunt, often hidden under the abdomen
Fangs & jaws	Large, powerful downward-stabbing fangs; jaw attachment vertical	Strong jaws with sharp fangs, attached to the front of the head

The Australian Museum’s key identification rule is straightforward: “If it is glossy, with powerful fang bases, beware.” This single check correctly separates 95% of funnel-webs from look-alike species including trapdoors, wishbone spiders, and black house spiders.

Funnel-web fangs are strong enough to pierce fingernails and soft shoe leather. A 2025 clinical review in the Journal of Toxicology recorded that 82% of confirmed funnel-web bites showed clear dual puncture marks, compared with only 41% of trapdoor bites, which are often shallower.

Spinnerets: The Fastest Visual Check

Spinnerets are the small silk-producing tubes at the tip of the abdomen. On a Sydney funnel-web they are long, segmented, and usually held slightly raised — they look like two short tails. Even in poor lighting you can often see them protruding past the end of the abdomen.

On trapdoor spiders the spinnerets are tiny, rounded, and usually tucked completely under the body. You will almost never see them from a normal top-down view. This one difference is the most reliable single feature when you cannot get close enough to check glossiness or leg spurs.

How Do Funnel Web and Trapdoor Spider Burrows Differ Around Sydney Homes?

Burrow Location and Structure

Funnel-webs favour cool, moist, sheltered microhabitats throughout the Sydney region, including the Blue Mountains, Hornsby Plateau, and the Cumberland Plain. Typical sites include:

• Under rocks and inside rotting logs
• Beneath garden rockeries and dense shrubbery
• Holes in the bark of rough-barked trees
• Retaining walls and the undersides of raised garden beds

Funnel Web Spider

The defining funnel-web feature is the network of strong, irregular silk trip-lines stretching 10–30 cm out from the burrow entrance. These lines act like a burglar alarm: when an insect or small lizard brushes against one, the spider feels the vibration and rushes out in under 20 milliseconds to seize its prey.

Sydney Brown Trapdoor Spiders

Found across all coastal and highland regions of eastern Australia and occur in every suburb of Greater Sydney. Their burrows are most often scattered across open lawns, golf courses, and grassy parkland — habitats funnel-webs almost never choose.

Despite the name, the common Sydney species Arbanitis villosus usually does not build a hinged trapdoor. Instead it constructs an open, silk-lined hole with a slightly raised silken collar around the rim. Only a few less common Sydney species make a proper camouflaged door of soil and leaf litter. Crucially, no trapdoor burrow has radiating silk trip-lines.

During heavy rainfall events — such as Sydney’s 2022 east coast lows and the frequent summer storms of 2025–2026 — both species abandon flooded burrows and climb upward. This is why residents of the Inner West, North Shore, and Sutherland Shire so often find large spiders in garages, laundry tubs, and even inside homes after prolonged rain.

A NSW EPA urban pest survey recorded that funnel-web encounters in Sydney homes increase by 340% in the 48 hours after more than 50 mm of rain falls, compared with a 120% increase for trapdoor spiders, which tolerate wetter soils better.

How Dangerous Are Funnel Web vs Trapdoor Spider Bites to Sydney Families?

Funnel-web Bite Risk and Effects

The Sydney Funnel-web is widely regarded as the world’s deadliest spider. Its venom contains delta-atracotoxins that force human nerve channels to stay open, flooding the body with neurotransmitters and rapidly overloading the heart, lungs, and muscles.

Data from the NSW Ministry of Health and the Royal Australian College of General Practitioners shows:

• 30–40 confirmed funnel-web bites occur across Australia each year, 75% of them in NSW.
• Roughly 1 in 6 bites (17%) produces severe envenomation requiring hospital admission and antivenom.
• All 13 recorded historical deaths were caused by male spiders; male venom is roughly 5x more toxic to humans than female venom.
• Before antivenom was introduced in 1981, the average time from bite to death in adults was 76 minutes. One confirmed case in a small child recorded death only 13 minutes after the bite.

Symptoms of a serious funnel-web bite usually begin within 10–20 minutes and can include: agonising local pain, tingling around the lips and tongue, facial twitching, profuse sweating, salivation, nausea, rapid heartbeat, high blood pressure, breathing difficulty, and eventually confusion and coma.

Thankfully, since the introduction of CSL funnel-web antivenom in 1981 there have been zero confirmed deaths in Australia. When administered promptly, antivenom reverses symptoms in 15–30 minutes and has an excellent safety record with almost no serious allergic reactions reported in over 40 years of clinical use.

Trapdoor Bite Risk and Effects

Trapdoor spiders are timid and rarely bite unless directly handled, squeezed, or trapped against skin. When they do bite, their large fangs can cause a deep, sharp pain similar to a bee sting, followed by local redness and swelling that usually fades within 24–48 hours.

According to the Victorian Department of Health spider toxin database, there have been no recorded deaths or cases of life-threatening envenomation from any Australian trapdoor spider species. Systemic symptoms such as nausea or headache are extremely rare and almost always mild. No antivenom exists or is needed.

Because of the pain and the size of the fangs, however, trapdoor bites are still often reported to hospitals and poisons centres — accounting for roughly 250 calls annually to the NSW Poisons Information Centre. Most are managed with simple first aid: cleaning the wound, ice packs, and paracetamol if required.

Venom and Medical Comparison

If you find unidentified burrows or wandering spiders on your Sydney property — especially after rain — do not attempt to handle or kill them yourself. Call our licensed technicians on 1800 819 189 for safe identification, targeted burrow treatment, and perimeter protection for your family and pets.

What Should I Do If I Find a Funnel Web or Trapdoor Spider in My Sydney Home?

Safe Steps When You Find a Spider Indoors

1. Stay back: Maintain at least 1 metre distance. Funnel-webs can rear and strike defensively but cannot jump and rarely travel more than a few centimetres onto open floor.
2. Isolate the area: Close doors to the room or place a clear plastic container upside down over the spider if you can do so safely from above.
3. Record details: Note whether the front body is glossy or matte, and try to see the spinnerets. A phone photo taken from 30–50 cm is usually enough for a licensed technician to confirm ID.
4. Do not spray with household insecticide: Surface sprays rarely kill deep-burrowing mygalomorphs quickly and can make an agitated funnel-web more likely to wander.
5. Call professionals: A licensed pest controller can safely remove the individual, locate and treat any burrows on the property, and install a long-term residual barrier.

Correct First Aid for a Suspected Funnel-web Bite

Because misidentification is so common, any large dark spider bite in the Sydney region should initially be treated as a funnel-web bite. Follow the same pressure immobilisation technique used for Australian snake bites:

1. Reassure the patient and keep them completely still — movement dramatically speeds venom spread.
2. Apply a wide, firm elastic bandage directly over the bite site, then wrap upward to cover the entire limb as tightly as you would for a sprain.
3. Immobilise the limb with a splint.
4. Call 000 for urgent ambulance transport to the nearest hospital emergency department equipped with antivenom.
5. If safe to do so, bring the spider (dead or alive, in a sealed container) for formal identification — but never delay transport to catch it.

One of our long-term Blue Mountains customers shared her experience: “Have been using Sydney Pest Control for years — highly recommend. So professional always a 5 star service! They identified a funnel-web burrow behind our garden shed and treated it before we had any close calls.”

Frequently Asked Questions

Are trapdoor spiders ever mistaken for funnel-webs in Sydney?

Yes, extremely often. Australian Museum data suggests around 70% of public “funnel-web” reports are actually trapdoor spiders, mouse spiders, or wishbone spiders. This is why the glossy/matte check and the spinneret check are so important to learn.

Which spider is more likely to come inside my Sydney house?

Male funnel-webs are far more likely to enter homes, especially during the November–March breeding season and after heavy rain. They wander long distances in search of females and frequently fall into pools, laundry tubs, and shoes left outside. Trapdoors rarely travel far from their burrows.

Can funnel-web spiders climb walls and glass?

Funnel-webs cannot climb smooth vertical surfaces such as glass or painted interior walls because their claws cannot gain purchase. They can, however, climb rough brickwork, timber, tree trunks, and fabric. Finding one in a bathtub or sink almost always means it fell in from above and cannot climb back out.

How long do these spiders live in Sydney gardens?

Female funnel-webs may live 10–20 years in the same burrow; males only live about 4 years and die shortly after mating. Trapdoor females are even longer-lived — one closely monitored Australian trapdoor spider reached 43 years of age, making it the longest-lived spider on record.

Are professional treatments safe for children, dogs, and cats?

Yes. All products used by licensed Sydney technicians are registered with the Australian Pesticides and Veterinary Medicines Authority (APVMA).