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Cupboard Spider
Steatoda grossa
A cosmopolitan and extremely hardy cobweb spider, frequently called the False Black Widow due to its striking physical appearance, commonly found thriving in dark, undisturbed indoor corners.
Class:Arachnida
Order:Araneae
Family:Theridiidae
Genus:Steatoda
Species:Steatoda grossa
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Environment
Terrestrial
Humidity
40 - 60 %
Ambient temperature
18 - 24 °C
Day temperature
22 °C
Night temperature
18 °C
Substrate depth
>= 2 cm
UVB
None
Species description
Geographical Origin and Habitat: A cosmopolitan species native to Eurasia but now found globally. It commonly inhabits indoor environments such as dark corners in closets, basements, wall crevices, and garages, as well as outdoor habitats under rocks and woodpiles.
Taxonomy and Genetics: Belongs to the family Theridiidae and the genus Steatoda. Frequently referred to as the Cupboard Spider or False Black Widow due to its close morphological similarity to the true black widow spiders (Latrodectus), though it lacks the red hourglass markings.
Behavior and Habits: Spins a chaotic, tangled three-dimensional cobweb in dark, sheltered areas. The spider spends daylight hours hidden inside a silk retreat at the edge of the web, emerging at night to capture walking insects triggered by the silk lines.
Morphology: Features a bulbous, glossy abdomen ranging in color from dark purple-brown to shiny black, often adorned with pale crescent-shaped markings on the front. Mature females measure 6 to 10 mm in body length; males are smaller and more slender.
Care, breeding and tankmates
Terrarium Setup: A small, vertically oriented terrarium (minimum 20x20x25 cm) is required. Place dry twigs, cork bark, or synthetic decorations in the upper corners to serve as anchoring points for its web; use a dry 2 cm peat or coco-coir substrate.
Lighting and Heating: Thrives at standard room temperature (18-24 °C) and does not require specialized lighting. Protect the enclosure from direct sunlight and avoid heat sources exceeding 26 °C, which can cause lethal overheating.
Humidity and Hydration: Prefers low humidity levels (40-60%). Do not mist the substrate directly; instead, lightly spray a few small droplets of water onto the outer edge of the web once every two weeks for drinking purposes.
Feeding and Supplementation: Strictly insectivorous. Feed live crickets, flies, or mealworms once a week or every 10 days by tossing the prey directly into the web. Remove uneaten prey or insect remains to maintain enclosure hygiene.
Compatibility: Strictly solitary. Exhibiting high levels of cannibalism, these spiders cannot be housed together; females will attack and consume any tankmates, including males outside of controlled breeding attempts.
Health and Common Diseases: An exceptionally resilient species with few health problems. Their venom is of low medical significance to humans, causing only localized pain and mild swelling if bitten; handle using collection cups rather than bare hands.
Geographic Origin and Distribution
A cosmopolitan species native to Eurasia but now found globally. It commonly inhabits indoor environments such as dark corners in closets, basements, wall crevices, and garages, as well as outdoor habitats under rocks and woodpiles.
Origin
Cosmopolitan or introducedNorth America
Terrestrial invertebrate profile
- Diet
- No verified data available
- Life expectancy
- No verified data available
- Adult size
- 1 cm
- Lifestyle/Microhabitat
- No verified data available
- Activity cycle
- No verified data available
- Sociality
- No verified data available
- Reproduction
- No verified data available
- Venom level
- No verified data available
- Handling tolerance
- No verified data available
- Brumation
- No verified data available
- Molting
- No verified data available
The catalog's scalar value is 1 cm. The British Arachnological Society — False Widow Spiders source reports a maximum adult measurement of 1 cm for this species, recorded as body length. The taxonomic record consulted is Steatoda grossa. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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