The Venomous Mouse Spider: Characteristics and Dangers

Introduction: The Mouse Spider

The mouse spider is a venomous spider that belongs to the genus Missulena. These arachnids are found in Australia, where they are infamous for their venomous bites. Although their name suggests that they prey on mice, these spiders actually feed on insects and other small invertebrates. The mouse spider is related to the funnel-web spider, which is also found in Australia and is considered one of the most dangerous spiders in the world.

Geographic Distribution of the Venomous Spider

The mouse spider is found throughout Australia, including in urban areas. They prefer dry habitats, such as heathlands and scrublands, and are commonly found in sandy soils. These spiders are most active during the warmer months, from September to April. The distribution of mouse spiders overlaps with that of the funnel-web spider, which is found in the eastern and southeastern parts of the country.

Morphological Characteristics of the Mouse Spider

The mouse spider is a medium-sized spider, with females growing up to 35 mm in length and males up to 20 mm. They have a robust body, with a shiny black or dark brown carapace and abdomen. The legs and pedipalps are dark brown or black, and the males have distinctive white patches on the tips of their pedipalps. The mouse spider has eight eyes, arranged in two rows of four, and fangs that can be up to 6 mm long.

Diet and Habitat of the Venomous Spider

The mouse spider feeds on insects, such as crickets and grasshoppers, as well as other small invertebrates. They are often found in burrows in the ground, which they create themselves or take over from other animals. The burrows are lined with silk and have a trapdoor that the spider can close when it feels threatened. Mouse spiders are solitary animals, and males will often wander in search of females during the breeding season.

Reproduction of the Mouse Spider

The breeding season for mouse spiders typically occurs in the spring and summer months. The males will locate a female’s burrow and try to attract her by tapping on the trapdoor. If the female is receptive, she will emerge and allow the male to mate with her. Females can produce up to 100 eggs, which they will place in an egg sac and guard fiercely until they hatch. The spiderlings will remain with the female for a short period before dispersing.

Venomous Bite of the Mouse Spider

The venom of the mouse spider is potent and can cause severe symptoms in humans. The bite of a male mouse spider is considered more dangerous than that of a female, as males have larger fangs and produce more venom. The venom contains a mixture of neurotoxins and hemotoxins, which can cause paralysis and tissue damage.

Symptoms of the Mouse Spider Bite

The symptoms of a mouse spider bite can vary depending on the individual and the amount of venom injected. Common symptoms include pain at the bite site, sweating, nausea, vomiting, and headache. More severe symptoms can include muscle spasms, difficulty breathing, and loss of consciousness. In rare cases, a mouse spider bite can be fatal.

Treatment of the Venomous Bite

If you are bitten by a mouse spider, it is crucial to seek medical attention immediately. The first aid treatment for a venomous spider bite involves applying a pressure immobilization bandage and keeping the affected limb still. This will slow the spread of the venom through the lymphatic system. Antivenom is available for mouse spider bites, and it is effective if given promptly.

Prevention and Control of the Mouse Spider

To reduce the risk of a mouse spider bite, it is essential to take precautions when working or playing in areas where they are found. Wear protective clothing, such as gloves and boots, and avoid reaching into dark crevices or holes. Keep your yard clear of debris and clutter, which can provide hiding places for spiders. If you find a mouse spider in your home or yard, do not attempt to handle it yourself. Call a professional pest control service to remove it safely.

Comparison with Other Venomous Spiders

The mouse spider is often compared to the funnel-web spider, which is considered one of the most dangerous spiders in the world. Both spiders are found in Australia, have potent venom, and can cause severe symptoms in humans. However, the funnel-web spider is larger and more aggressive than the mouse spider and is responsible for more deaths.

Conclusion: The Importance of Mouse Spider Awareness

The mouse spider is a venomous spider that is found throughout Australia. While they are not as dangerous as the funnel-web spider, their bite can cause severe symptoms in humans. It is essential to be aware of the risks associated with these spiders and take precautions to avoid being bitten. If you are bitten, seek medical attention immediately to receive appropriate treatment.

References and Further Reading

  • Australian Museum. (n.d.). Mouse Spiders. Retrieved from
  • Australian Venom Research Unit. (n.d.). Mouse Spider. Retrieved from
  • Isbister, G. K., & Gray, M. R. (2003). A prospective study of 750 definite spider bites, with expert spider identification. The Quarterly Journal of Medicine, 96(4), 265-273.
  • Sutherland, S. K., Tibballs, J., & Russell, F. D. (2001). Australian animal toxins: the creatures, their toxins and care of the poisoned patient. Oxford University Press.
Mary Allen

Written by Mary Allen

Hello, I'm Mary! I've cared for many pet species including dogs, cats, guinea pigs, fish, and bearded dragons. I also have ten pets of my own currently. I've written many topics in this space including how-tos, informational articles, care guides, breed guides, and more.

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