Northern Tree Funnel-Web Identification: H. formidabilis

About the Northern tree funnel-web spider

The northern tree funnel-web, Hadronyche formidabilis, is Australia’s largest known funnel-web spider, with adults reaching about 4–5 cm in body length. It is a wet-forest tree specialist rather than a spider found across all of eastern Australia: confirmed records extend from the Hunter and Watagans of New South Wales through the north-east of the state into south-eastern Queensland. Look for a large, robust dark funnel-web with a hard glossy carapace, tightly grouped eyes, powerful parallel-moving jaws and conspicuous rear spinnerets, together with a silk retreat inside a tree rot hole, trunk fracture or hollow deadwood pipe. Exact identification from a photograph is rarely possible because the decisive characters require expert examination. A suspected bite from this or any large black spider is a medical emergency; do not wait for species confirmation.

Exact-species specimen views

These licensed exact-taxon photographs show useful anatomy and variation. Use each caption for record and image context; no single image set represents every colour, posture or habitat.

How to identify Hadronyche formidabilis safely

Start at the Australian funnel-web family level. Atracids have a hard glossy carapace without an obvious dorsal pattern, a softer hairier abdomen, powerful down-striking jaws, a compact eye group and four spinnerets at the rear. H. formidabilis is exceptionally large and has a relatively long, narrow carapace and longer spinnerets than some close relatives. Gray’s taxonomic revision separates the adult male by a large rounded, strongly spined structure on the second leg and the female partly by dense long fine hairs on the first two pairs of legs. These are expert characters, not features to inspect on a live spider. For a photograph, combine overall funnel-web structure, verified northern wet-forest locality and a tree-cavity retreat. If one part is missing, report Australian funnel-web or Hadronyche rather than forcing an exact species name.

Clues that are not enough on their own

• Black or glossy colour alone, because many funnel-webs, mouse spiders and other mygalomorphs are dark
• Large size without a measured body length, because leg span, camera perspective and fear can exaggerate scale
• Being found on a tree or log without seeing a silk-lined cavity retreat and the spider’s structure
• A Queensland or northern NSW location by itself, because several Hadronyche and other burrow spiders occur in the region
• A “funnel” label applied to any hole, tangle or sheet of silk without checking its tree-cavity setting

Colour, sex and life-stage variation

“Glossy black” is useful only as a broad funnel-web clue. Depending on sex, age, preservation and lighting, the carapace can look black, mahogany or reddish brown, while the hairy abdomen is duller and may be dark or light maroon-brown. Mature males are generally slimmer and longer-legged, with enlarged bulb-like palps, while females are broader and can attain the largest body size. Juveniles are smaller and may be browner or less heavily hardened. Older records may use Atrax formidabilis, the name under which Rainbow described the species in 1914; the accepted name is Hadronyche formidabilis. All three licensed images on this page show exact-species Australian Museum specimens: a male, a female and a paired sex comparison. They are valuable for anatomy and proportions but preserved specimens do not show a live spider’s natural colour, posture, web or habitat.

Behaviour, web and retreat

This spider is unusually arboreal. Australian Museum and taxonomic records place retreats in holes caused by trunk or branch fractures, rotting wood, epiphytic growth and the decayed “pipes” inside large trees such as tallowwood. Some individuals have been found more than 30 metres above ground, and some appear to live and feed entirely inside a heartwood pipe. Silk lines around the entrance transmit the movement of beetles and other insects to the hidden spider; this is an irregular retreat and trip-line system, not a circular orb web. Females and juveniles may remain within the same protected structure, whereas a mature male can leave shelter while searching for a mate. Never peel bark, split a log, climb to a retreat, insert a tool or pour liquid into the silk to make the spider appear.

Australian distribution

Gray’s 2010 revision gives the confirmed range as north-eastern New South Wales from the Hunter River to south-eastern Queensland. Examined records include the Dungog, Karuah, Forster, Taree and Barrington Tops districts; Armidale, Dorrigo, Bellingen, Kempsey, Grafton, Lismore and Murwillumbah; and Queensland localities around Lamington Plateau, O’Reilly’s and Binna Burra. The Australian Museum summarises the habitat as wet forest north from the Watagans into southern Queensland. A historical Robertson record from the Southern Highlands was not confirmed and should not be used to stretch the identification range. “Northern tree funnel-web” is therefore a regional and ecological label, not a licence to identify every large dark spider in Queensland or New South Wales. Keep locality information with photographs, but avoid publishing a vulnerable household coordinate.

What to do if you find one

Keep children and pets away and do not touch, corner or provoke the spider. Around forest trees, do not place fingers into rot holes or move loose timber before checking from a distance; arborists, firewood handlers and gardeners should use tools and protective work practices rather than hands around hidden cavities. If a spider is indoors and nobody has been bitten, isolate the room and use zoom for photographs. A licensed pest professional is safer than bare-handed relocation. Only a confident adult should consider a wide-container and stiff-card capture when hands can remain well away and there is no fall or bite risk; closing the area is preferable. If a bite may have occurred, abandon identification and capture, call 000, keep the person still and begin pressure immobilisation. Do not wait for severe pain, sweating, tingling around the mouth, nausea, muscle twitching, breathing difficulty or confusion. Absence of early symptoms is not reassurance, and venom research confirms that H. formidabilis is one of the medically important tree-dwelling funnel-webs.

Compare with similar spiders

Use body shape, web or retreat, location and behaviour together before settling on a likely match.

• Australian funnel-web spiders — Australian funnel-web spiders - use the family-level page when the glossy carapace, compact eye group, powerful jaws and spinnerets fit but the exact tree retreat, range or specialist anatomy is not documented. This is the correct result for many photographs.
• Darling Downs funnel-web spider — Darling Downs funnel-web spider - Hadronyche infensa overlaps parts of south-eastern Queensland and north-eastern NSW but is primarily a ground-retreat species. A wandering mature male away from a retreat may still be impossible to separate safely from a photograph.
• Border Ranges funnel-web spider — Border Ranges funnel-web spider - Hadronyche lamingtonensis is another rainforest Hadronyche from the Queensland–NSW border region. It is separated by specialist anatomy and more local distribution; rainforest locality alone cannot establish either species.
• Mouse spider — Mouse spider - Missulena can also be large, dark, robust and medically significant, but usually has an especially broad bulbous head, eyes spread farther across the front and shorter spinnerets. Never approach a live spider to check; a suspected bite receives the same emergency response.

Sources for this profile

These accessible authoritative sources support the identification and bite-safety context on this page.

• Australian Faunal Directory: Hadronyche formidabilis
• Atlas of Living Australia: Hadronyche formidabilis
• Australian Museum: Australian funnel-web spiders
• Records of the Australian Museum: Revision of the Australian funnel-web spiders
• PubMed: Systematic review of funnel-web spider bites
• PubMed: Venom of tree-dwelling Australian funnel-web spiders
• healthdirect: Spider bites

Profile review

Published by Spider Identifier Australia. Last factual review: 10 August 2026.