Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Calendar
Upcoming Events

Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

National Moth Week was July 23-31, 2022! See moth submissions.

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

Photos of insects and people from the 2019 gathering in Louisiana, July 25-27

Photos of insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12


Previous events


TaxonomyBrowse
Info
ImagesLinksBooksData

Genus Steatoda

Cobweb spider? - Steatoda borealis Steatoda sp. - Steatoda grossa - female Cobweb Spider - Steatoda triangulosa - female Steatoda borealis? - Steatoda borealis Brown Spider - Steatoda - male triangulate cobweb spider - Steatoda triangulosa - male Steatoda albomaculata? - Steatoda albomaculata - female What is this - Steatoda
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Theridiidae (Cobweb Spiders)
Genus Steatoda
Numbers
20 species in our region. (1)
19 species and one subspecies according to the World Spider Catalog. Changes in taxonomy may be the reason for this discrepancy. S. americana and pulchra have been moved to Asagena.
Size
Females: 2.5-11.0 mm; Males: 2.0-7.5 mm. (1)
Identification
Coloration purple-brown, often with white line around anterior of abdomen and other markings. Large colulus.

Steatoda variata
Range
More specific range information will be added when time/resources allow.

S. alamosa
S. albomaculata - Southern Canada to central Mexico
S. apacheana
S. atascadera
S. borealis (only one in AK)
S. castanea (Canada)
S. erigoniformis (tropical)
S. grandis
S. hespera - Western United States
S. mexicana
S. nobilis - Ventura County, CA
S. palomara - San Diego County, CA
S. punctulata
S. quadrimaculata
S. transversa
S. triangulosa - Widespread in the United States.
S. variata - UT, AZ, CO, NM, western TX, Mexico
- variata china - very southern tip of TX
S. washona
See Also
Internet References
digitallibrary.amnh.org - PDF Article, The fulva group of the spider genus Steatoda (Araneae, Theridiidae). Gertsch, 1960. (good reference)

biodiversitylibrary.org - PDF Article, Spider Genera Crustulina and Steatoda. Levi, 1957. (good reference)
Works Cited
1.Spiders of North America: An Identification Manual
D. Ubick, P. Paquin, P.E. Cushing and V. Roth (eds). 2005. American Arachnological Society.