Gray House Spider – Badumna Longinqua

The gray house spider, Badmuna longinqua, is a medium sized black and gray spider originally native to Australia. It has been introduced to New Zealand, South America, Europe, South Africa and the United States. Despite the reputation of Australian spiders, the grey house spider is harmless for humans and larger pets. Due to its secretive nature, it is rarely encountered by humans, even though their preferred habitat is inside people’s homes. In the United States, the largest populations of gray house spiders are found in California and Florida.

Gray House Spider Description

The gray house spider is a dark spider with relatively short legs. The cephalothorax (head) is almost black with some gray hairs while the oval-shaped abdomen is covered with gray hairs. The hairs on the abdomen look like gray spots on a black background with some lighter and some darker areas. The legs are black with black or dark gray bands.

Grey house spider - black spider on ground with grey or white pattern on back in California.
A gray house spider on the ground. You can see the grey patterns or spots on the back of the abdomen. Photo: Geoff Shuetrim

Size

The gray house spider is a medium-sized spider. Adult females reach a maximum body length of 0.6 inches (15 mm). As is true for most spiders, males are smaller and reach a maximum size of 0.45 inches (12 mm).

Web

As their common name suggests, grey house spiders often build their webs inside human structures where they find moderate temperatures year-round. Females are believed to live for around two years and can spend their entire life on the same web – as opposed to many orb weavers who rebuild their large webs every single day.

Gray house spiders build disorderly and erratic webs around small cracks or other hiding places. The web contains a funnel that extends towards the hiding place surrounded by numerous strands of silk. These structures are called lace webs. The spider usually hides at the end of the funnel web during the day and emerges onto the web at night, waiting for small prey animals to pass by and getting stuck in the web.

Even though gray house spiders often live in houses, they are hardly ever seen due to their secretive nature.

Gray House Spider - Badumna Longinqua in web gray or brown spider with tangled web
A brown gray house spider in its tangled web. Photo: Katja Schulz

Bite

Grey house spiders are timid spiders and usually remain well hidden throughout the day. Therefore, encounters with humans are rare and bites hardly ever occur. The spider’s first instinct is to escape rather than attack. In the rare cases in which a bite occurs, it is not known to cause harm to humans or larger pets.

Badumna longinqua scientific classification

  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Subphylum: Chelicerata
  • Class: Arachnida
  • Order: Araneae
  • Infraorder: Araneomorphae
  • Family: Desidae
  • Genus: Badumna
  • Species: Badumna longinqua

Occasionally, the gray house spider is also referred to as the brown house spider.

Geographic Range of the gray house spider in the United States

In the United States, the gray house spider can be found along the West Coast (Oregon, Washington, California) as well as in Florida and Hawaii.

References

  • Taxon details: World Spider Catalogue
  • Binominal name from: Koch, 1867
  • Nentwig, W.; Blick, T.; Gloor, D.; Hangii, A.; Kropf, C. “Badumna longinqua”. Universitaet Bern. Universitaet Bern.
  • Ubick, D. (2005). Spiders of North America: An Identification Manual. New York , USA: American Arachnological Society.
Gray House Spider – Badumna Longinqua

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