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Genus Steatoda

Cobweb Spider - Steatoda triangulosa - female Interesting spider - Steatoda - female Black Spiders - Steatoda albomaculata - male Adult Female - Steatoda hespera - female Small black spider with egg sac - Steatoda Steatoda - male Steatoda triangulosa - male Steatoda grandis - female
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
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.
Females: 2.5-11.0 mm; Males: 2.0-7.5 mm. (1)
Coloration purple-brown, often with white line around anterior of abdomen and other markings. Large colulus.

Steatoda variata
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 - PDF Article, The fulva group of the spider genus Steatoda (Araneae, Theridiidae). Gertsch, 1960. (good reference) - 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.