- Scientific Name
- order: Araneae
- Pest Alias
- Redback, Black house spiders, garden spiders, orb spiders
- Kingdom:
- Animalia
- Phylum:
- Arthropoda
- Subphylum:
- Chelicerata
- Class:
- Arachnida
- Order:
- Araneae
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Spider - web spinning
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- Scientific Name
- order: Araneae
- Pest Alias
- Redback, Black house spiders, garden spiders, orb spiders
- Kingdom:
- Animalia
- Phylum:
- Arthropoda
- Subphylum:
- Chelicerata
- Class:
- Arachnida
- Order:
- Araneae
As their name suggests, web-building spiders spin webs to catch their food. The common web-building spiders found around the home include the redback and black house spiders, as well as the various garden spiders, such as the orb spiders.
Both redbacks and black house spiders can give nasty bites, so there are good reasons to get rid of them, but they also build very messy webs which can be unsightly. Black house spiders build their dense webs around windows, doors and under eaves. Redback webs are less well defined and often contain debris such as dried leaves and will be built in dry areas – around vents, fences and in roof voids, often around downlights.
Although garden spiders are generally viewed as beneficial (as they get rid of other garden pests), their size can make them a bit scary, and their large webs built across paths can catch humans as well as insects!
Treatment for web-building spiders is fairly straightforward. Their hiding spots can be easily identified (there will be a web nearby) and can be treated along with similar potential hiding spots.
A comprehensive spider treatment for web-building spiders will treat all these hiding spots and any visible webs, as well as treating exterior surfaces – around windows, doors, vents and weep holes, and under eaves – with a long-lasting insecticide. The treatment will kill any spiders present and the long-lasting residual effect will control any spiders moving into the area, thus preventing the building of new webs.
After a treatment, it is important to leave the webs in place for a few days, just in case the owner of the web did not come into contact with the initial treatment. When the spider comes out onto the web, it picks up the insecticide from the web and dies.
When you are ready to remove the webs, simply brush them down. DON’T wash the webs away with a hose, as the water will also wash away the treatment, reducing the duration of protection.
Treatment for running or hunting spiders is more of a challenge.
The black house spider or common black spider (Badumna insignis) is a common species of cribellate Australian spider, introduced to New Zealand and Japan. A closely related species, Badumna longinqua, the grey house spider, has a similar distribution, but has also been introduced to the Americas.[2]
Ludwig Carl Christian Koch described Badumna insignis in 1872.[1]
Description
 |
This section needs additional citations for verification. (January 2025)
|
B. insignis is a dark, robust spider. The female grows up to 18 mm, with a 30 mm leg span. As with most spiders, the males are smaller (10 mm) and have longer legs in relation to their body size. In both sexes, the carapace and legs are dark brown to black, and the abdomen is charcoal grey with a dorsal pattern of light markings (sometimes indistinct) and a dense covering of fine, velvety hair. B. longinqua is slightly smaller (14 mm) with a greyish carapace and black-brown legs.[3]
Habits, mating, and reproduction
|
|
This section needs additional citations for verification. (January 2025)
|
The web of B. insignis is a messy-looking construct of irregular sail-like shapes. There is a funnel-shaped, silken retreat, usually in the middle or corner of the web, where the spider spends most of its time waiting for prey. The female spider never leaves the web unless forced to. They seem quite attached to their location, rarely changing the position of their webs and because of this, old webs can be quite messy, often with small objects or dust stuck in them. At night the spider comes out to repair and add to the web, often just adding new silk over the old. Males, when ready to mate, go in search of females. The male plucks the web of the female to attract her attention. Once the male has made sure that the female will be receptive, he will approach and inseminate her with his palps. They may then stay together for several days and may mate again several times.[4]
The female constructs several white silk egg sacs, which are secured within the web retreat. The female stays with the eggs until they hatch. The spiderlings may then disperse or remain in the web of the mother for some time, catching the smaller prey that the larger spider would ignore.[5]
Predators include the white-tailed spider, as well as parasitic wasps and flies.
Bite
Black house spiders are venomous but are not considered dangerous. They are timid and bites from them are infrequent. The bite may be excruciatingly painful and cause local swelling. Symptoms such as nausea, vomiting, sweating, and dizziness are occasionally recorded. In a few cases, skin lesions (arachnogenic necrosis) have developed after multiple bites.[6]
Distribution and habitat
|
|
This section needs additional citations for verification. (September 2017)
|
B. insignis is native to Australia but has been introduced to New Zealand and Japan.[1] It is widely distributed throughout Australia and New Zealand. In their natural habitat, they are usually found on rough-barked trees, whereas inside buildings they are often found in corners, around windows and doorways, or where other light sources may attract prey insects. The related B. longinqua may be found in similar locations, but is more often found outdoors.
References
- ^ a b c d "Taxon details Badumna insignis (L. Koch, 1867)". World Spider Catalog. Natural History Museum Bern. Retrieved 15 September 2017.
- ^ "Taxon details Badumna longinqua (L. Koch, 1867)", World Spider Catalog, Natural History Museum Bern, retrieved 15 September 2017
- ^ "Black House Spider". The Australian Museum. Retrieved 2024-08-05.
- ^ Reidy, Gordon (2023-11-10). "Black House Spiders - All you need to know!". PestXpert. Retrieved 2024-08-05.
- ^Â "Spider Facts: The Black House Spider".
- ^Â "Common neighbourhood spiders". Government of Western Australia.
Preston-Mafham, Ken (1998). Spiders: Compact Study Guide and Identifier. Angus Books. ISBN978-1-904594-93-2.
External links
 Media related to Badumna insignis at Wikimedia Commons
This article uses material from the Wikipedia article "Black house spider", which is released under the Creative Commons Attribution-Share-Alike License 3.0. Content may have been omitted from the original, but no content has been changed or extended.
Spider - web spinning
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As their name suggests, web-building spiders spin webs to catch their food. The common web-building spiders found around the home include the redback and black house spiders, as well as the various garden spiders, such as the orb spiders.
Both redbacks and black house spiders can give nasty bites, so there are good reasons to get rid of them, but they also build very messy webs which can be unsightly. Black house spiders build their dense webs around windows, doors and under eaves. Redback webs are less well defined and often contain debris such as dried leaves and will be built in dry areas – around vents, fences and in roof voids, often around downlights.
Although garden spiders are generally viewed as beneficial (as they get rid of other garden pests), their size can make them a bit scary, and their large webs built across paths can catch humans as well as insects!
Treatment for web-building spiders is fairly straightforward. Their hiding spots can be easily identified (there will be a web nearby) and can be treated along with similar potential hiding spots.
A comprehensive spider treatment for web-building spiders will treat all these hiding spots and any visible webs, as well as treating exterior surfaces – around windows, doors, vents and weep holes, and under eaves – with a long-lasting insecticide. The treatment will kill any spiders present and the long-lasting residual effect will control any spiders moving into the area, thus preventing the building of new webs.
After a treatment, it is important to leave the webs in place for a few days, just in case the owner of the web did not come into contact with the initial treatment. When the spider comes out onto the web, it picks up the insecticide from the web and dies.
When you are ready to remove the webs, simply brush them down. DON’T wash the webs away with a hose, as the water will also wash away the treatment, reducing the duration of protection.
Treatment for running or hunting spiders is more of a challenge.
The black house spider or common black spider (Badumna insignis) is a common species of cribellate Australian spider, introduced to New Zealand and Japan. A closely related species, Badumna longinqua, the grey house spider, has a similar distribution, but has also been introduced to the Americas.[2]
Ludwig Carl Christian Koch described Badumna insignis in 1872.[1]
Description
|
|
This section needs additional citations for verification. (January 2025)
|
B. insignis is a dark, robust spider. The female grows up to 18 mm, with a 30 mm leg span. As with most spiders, the males are smaller (10 mm) and have longer legs in relation to their body size. In both sexes, the carapace and legs are dark brown to black, and the abdomen is charcoal grey with a dorsal pattern of light markings (sometimes indistinct) and a dense covering of fine, velvety hair. B. longinqua is slightly smaller (14 mm) with a greyish carapace and black-brown legs.[3]
Habits, mating, and reproduction
|
|
This section needs additional citations for verification. (January 2025)
|
The web of B. insignis is a messy-looking construct of irregular sail-like shapes. There is a funnel-shaped, silken retreat, usually in the middle or corner of the web, where the spider spends most of its time waiting for prey. The female spider never leaves the web unless forced to. They seem quite attached to their location, rarely changing the position of their webs and because of this, old webs can be quite messy, often with small objects or dust stuck in them. At night the spider comes out to repair and add to the web, often just adding new silk over the old. Males, when ready to mate, go in search of females. The male plucks the web of the female to attract her attention. Once the male has made sure that the female will be receptive, he will approach and inseminate her with his palps. They may then stay together for several days and may mate again several times.[4]
The female constructs several white silk egg sacs, which are secured within the web retreat. The female stays with the eggs until they hatch. The spiderlings may then disperse or remain in the web of the mother for some time, catching the smaller prey that the larger spider would ignore.[5]
Predators include the white-tailed spider, as well as parasitic wasps and flies.
Bite
Black house spiders are venomous but are not considered dangerous. They are timid and bites from them are infrequent. The bite may be excruciatingly painful and cause local swelling. Symptoms such as nausea, vomiting, sweating, and dizziness are occasionally recorded. In a few cases, skin lesions (arachnogenic necrosis) have developed after multiple bites.[6]
Distribution and habitat
|
|
This section needs additional citations for verification. (September 2017)
|
B. insignis is native to Australia but has been introduced to New Zealand and Japan.[1] It is widely distributed throughout Australia and New Zealand. In their natural habitat, they are usually found on rough-barked trees, whereas inside buildings they are often found in corners, around windows and doorways, or where other light sources may attract prey insects. The related B. longinqua may be found in similar locations, but is more often found outdoors.
References
- ^ a b c d "Taxon details Badumna insignis (L. Koch, 1867)". World Spider Catalog. Natural History Museum Bern. Retrieved 15 September 2017.
- ^ "Taxon details Badumna longinqua (L. Koch, 1867)", World Spider Catalog, Natural History Museum Bern, retrieved 15 September 2017
- ^ "Black House Spider". The Australian Museum. Retrieved 2024-08-05.
- ^ Reidy, Gordon (2023-11-10). "Black House Spiders - All you need to know!". PestXpert. Retrieved 2024-08-05.
- ^Â "Spider Facts: The Black House Spider".
- ^Â "Common neighbourhood spiders". Government of Western Australia.
Preston-Mafham, Ken (1998). Spiders: Compact Study Guide and Identifier. Angus Books. ISBN978-1-904594-93-2.
External links
-  Media related to Badumna insignis at Wikimedia Commons
This article uses material from the Wikipedia article "Black house spider", which is released under the Creative Commons Attribution-Share-Alike License 3.0. Content may have been omitted from the original, but no content has been changed or extended.