The Funnel-web Spider: Australia's Most Dangerous Arachnid

Bites and Stings

Bites and Stings

Infographic on the Funnel-web Spider

Funnel-web spiders are commonly found along the eastern coast of Australia. They are one of the most dangerous spiders in the world, and have been attributed to numerous human fatalities. So how do you successfully treat a Funnel-web spider bite? Let's take a look.

More common in the states along the eastern coast of Australia, Funnel-Web Spiders are one of the deadliest spiders in the world due to their highly toxic and fast-acting venom and are one of the most feared arachnids in the animal kingdom.

All About the Funnel-Web Spider

Funnel-web spiders can be found all over the world, however, there are three main spider families that are popularly known generally as ‘funnel-web spiders’:

  1. Agelenidae,
  2. Hexathelidae, and
  3. Dipluridae.

While Agelinidae and Dipluridae spiders are quite harmless and can be found all the way from Central Asia to North America and Africa, their Australian cousins on the other hand are the opposite of harmless.

Hexathelidae, or commonly known as the funnel-web spider, is typically found in the eastern coast of Australia particularly New South Wales, South Australia, Victoria, Tasmania and Queensland. They are ground-dwelling spiders that have adapted to build funnel-shaped webs as burrows or to trap potential prey. These spiders get their name due the shape of their webs having a flat surface and a small funnel-like tube leading to a silken burrow where the spiders wait in anticipation. There are at least 40 species of funnel-web spiders native to Australia but the most venomous are the Sydney Funnel-Web Spider and the Northern Tree Funnel-Web Spider.

These spiders are among the most deadly in the world having been responsible for 13 total deaths and many more medically grave bites. This is mainly due to their highly toxic and fast-acting venom as they are able to kill a full-grown human adult in roughly 15 minutes. However, ever since the development of an antivenom in 1981, there have been zero recorded deaths as of writing. Most other species of funnel-web spiders are not harmful to humans however, it’s better to stay clear of them as they can be difficult to distinguish at first glance.

Identifying a Funnel-Web Spider

Being able to identify a funnel-web spider might save your life someday and here are some quick pointers to identify if the spider you’re looking at is indeed the deadly funnel-web kind.

Here are some identifiers that are typical of the funnel-web spider:

  • Medium or large body lengths ranging from 1 to 5 cm
  • Shiny, hairless, and glossy carapace (upper shell covering the front part of their bodies)
  • No obvious body pattern with typically black to brown body colour
  • Eyes closely grouped together
  • Four relatively long spinnerets (the silk-spinning organ of the spider)
  • Fangs that point straight down the body

Funnel-Web Spiders and Their Hunting Habits

As featured in their name, funnel-web spiders hunt by waiting in their makeshift funnel for prey to fall onto the horizontal web before it rushes out, grabs the prey, and takes it back into the funnel to consume. They typically make their burrows in moist, cool, and sheltered habitats such as under rocks, rotting logs, or in rough-barked trees. While you don’t have to worry about these spiders dwelling in your lawn, they are commonly found in suburban rockeries and shrubberies hiding in the shadows.

These spiders are mainly sedentary and spend their entire lives (female spiders can live up to 20 years!) inside the burrow – venturing into the outside world momentarily to lunge at any passing prey. Majority of their prey consists of insects and small vertebrates such as lizards and frogs.

Funnel-web Spider Sitting in an Underground Burrow

Funnel-web spiders create funnel-like webs deep in the ground as their homes, rarely venturing out until mating season.

Are Funnel-Web Spiders Dangerous to Humans?

With a total of 13 recorded deaths as of writing, funnel-web spiders can be dangerous to humans due to the highly toxic and quick-acting venom in each bite. However, not all funnel-web spiders are dangerous neither are they specifically out to get us. Research has shown that the development of these highly toxic bites was developed as a defence against predators.

Typically, when male funnel-web spiders are young, their venom is fatal to small insects which they eat. However, once these males begin their search for a female mate, they must leave the safety of their burrows and venture into the unknown. This is when their venom becomes potent enough to cause death in vertebrates such as reptiles, mammals, and even humans.

On the bright side, funnel-web spiders are the most poisonous during the spiders’ summer mating season – when majority of male spiders begin to leave their burrows, needing defences to protect themselves against potential predators.

What To Do If a Funnel-Web Spider Bites Me?

It’s crucial to act fast as the bite of this spider is fatal. Funnel-web spider bites are extremely painful with a noticeable red bump forming at the bite site. Other symptoms of a funnel-web spider bite include:

  • Nausea, vomiting, and abdominal pain,
  • Difficulty in breathing, disorientation, confusion, unconsciousness,
  • Heavy coughing,
  • Profuse sweat, tears, and saliva production,
  • Weakness or numbness in muscles and muscular twitching, and
  • Small hairs standing on end.

First Aid for a Funnel-Web Spider Bite

Once bitten, it’s important for you to keep this guide in mind:

  1. Keep the casualty at rest, reassured, and under observation.
  2. Call 000 or 112.
  3. Follow the basic life support guidelines per DRSABCD.
  4. Apply the Pressure Immobilisation Technique. The purpose of the pressure immobilisation technique is to prevent the venom from moving into circulation, thereby "buying" the patient time while they wait for medical treatment. Wrap a bandage over the bite site as tightly as you would a sprained ankle. Extend the bandage all the way up the limb, and then immobilise the limb. Note, the pressure immobilisation technique should only be used for Funnel-web spider bites and snake bites.
  5. Do not use a tourniquet.
  6. Do not cut, suck, or wash the bite site.

For more information about how to provide first aid for a Funnel-web spider bite, watch the video below:

Spider Bites and Anaphylaxis

If the casualty begins exhibiting signs of a severe allergic reaction, otherwise known as anaphylaxis, call Triple Zero (000) for an ambulance, consult the Australian Resuscitation Council's anaphylaxis treatment guideline, and follow DRSABCD and be prepared to perform CPR.

Conclusion

With spring just around the corner, it’s important to stay clear of these eight-legged creatures due to their toxic bites and the threat they pose to us. But if you do happen to stumble upon a funnel-web spider and unfortunately get bitten by one, it’s important to remember first aid procedure during emergencies. By applying these first aid techniques, you’ll be able to save a life in dire times.

If you’re interested in learning the skills and knowledge to provide first aid response and life support, check out our First Aid Course that will allow you to manage casualties, incidents and other first aiders until qualified emergency help arrives at the scene.

Recommended Resources

We also have articles on what to do if you get stung or bitten by a snake, fire ant, and different types of marine life.

And for more details on how to identify and treat bites from some of Australia's deadliest spiders, including White tail spiders, Wolf spiders, Huntsman spiders, and Redback spiders, head to our Resource Library.

Disclaimer: This article is for informational purposes only. It does not constitute, replace, or qualify as any form of first aid training.

Originally published at https://www.australiawidefirstaid.com.au/resources/funnel-web-spider
as part of the Australia Wide First Aid Articles Library

Related Articles

Cat Bite article header
First Aid for a Cat Bite

Cat bites, while often underestimated, can lead to serious health complications if not treated promptly and properly. Cats' mouths harbour a variety of bacteria that can cause infections in humans.

Drop Bear article header
First Aid for Drop Bear Attacks

Encounters with wildlife can often be thrilling, but when it comes to the creature known as the drop bear, the experience can quickly turn dangerous. A sharp increase in recent attacks prompts the need for understanding proper first aid procedures in case of an attack.

Funnel web spider article header
First Aid for Funnel Web Spider Bites

Encountering a funnel web spider can be a frightening experience, and if a bite occurs, it is crucial to act swiftly and effectively to minimize the potential risks associated with their venom.

Cat Scratch article header
How to Treat Cat Scratches

Cats are beloved pets for millions of people worldwide, but sometimes even the most gentle feline can become agitated or scared, leading to scratches. While cat scratches are usually not serious, they can still be painful and carry the risk of infection.

Green head ant close up
5 Most Common Ants in Australia

Australia is home to a remarkably diverse array of ant species, showcasing a fascinating range of characteristics and behaviours. By understanding the identification, range, and behaviours of these ants, individuals can navigate their surroundings with greater awareness and appreciation.

A golden-brown Teddy Bear Bee sitting on a plant stalk
5 Most Common Bees in Australia

Recognizing the significance of bees' positive impact, it becomes imperative to acquaint ourselves with the various species, distinguishing characteristics, geographical distributions, stinging tendencies, and suitable first aid measures for bee stings.

A brown Paper wasp sitting on a green leaf
5 Common Wasps in Australia

Australia is home to a diverse range of insect species, including several types of wasps. While some wasps are beneficial as predators of other pests, others can pose a threat due to their stinging capabilities.

Bird Dropping Spider
The Bird Dropping Spider: A Master of Mimicry

As their name suggests, the Bird Dropping Spider has developed colorations and patterns that mimic bird poo. This ingenious disguise means they can thrive in a wide variety of habitats, including suburban gardens.

The Slaty Grey Snake
The Slaty Grey Snake | Snake Facts

One of the most common snake species in Darwin and Australia's Top End region, the Slaty grey snake is a medium-sized species with shiny scales. They have been known to defend themselves aggressively when disturbed.

Golden Crowned Snake
The Secretive Golden Crowned Snake

The Golden crowned snake is well known for its crown of yellowish scales. Found along the east coast of Australia, this snake is relatively enigmatic due to its secretive and nocturnal nature.