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| Stereotypical widows' eyes pattern |
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| Steatoda grossa dorsal view (Male) |
Genus Steatoda (Teutana)
Species grossa
Common Name: False Black Widow, Cobweb Spider, Cupboard Spider
Location:
North America, Colorado, Arizona, New Mexico, and other inland island.
Size:
Female: 6-10.5 mm
Male: 4.1-10 mm
Habitat:
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| Resting Steatoda grossa dorsal view (Male) |
In cracks and crevice in day
Wood piles, under bridges, on walls
Times:
Males in autumn and summer
Females throughout the years
Foods:
Sowbugs (pill bugs)
Biological Characteristics:
People usually confused this species with their cousin, the black widow (Lactrodectus sp.). Male usually lives 1 to 1.5 years and Female can reach 6 years max. Since all spiders have venom, this species' bite can cause blister (less severe than Lactrodectus sp.)
References
Species Steatoda grossa- False black widow. n.d. In BugGuide.com. Retrieved from http://bugguide.net/node/view/6932
Steatoda grossa (False Black Widow). 2013. In Spider.us. Retrieved from http://www.spiders.us/guide/species/steatoda-grossa/
Steatoda Spiders. 2003. Washington State University. Retrieved from http://puyallup.wsu.edu/plantclinic/resources/pdf/pls107steatodaspider.pdf
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| Dorsal side of immature Achaearanea tepidariorum (Female) |
Genus Achaearanea (Parasteatoda)
Species tepidariorum
Common Name: American House Spider
Location:
Almost worldwide, most abundant in United States, South America, and Mexico
Size:
Female: ~6 mm
Male: <6 mm
Habitat:
Garden, Farm, roadsides, and indoor
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| Dorsal side of immature Achaearanea tepidariorum (Female) |
Times:
Throughout the year
Foods:
German cockroaches, scorpions, small insects
Biological Characteristics:
This species is always confused with it relatives, Tidarren sisyphoides due to the similar body size. This species plays the important role in making the cobwebs around two sides of the buildings. This spider can be found at the center of the when it is waiting for the prey and on the edge of the web when it is resting.
References
Edwards. G.B. 2012. Common name: Common house spider. University of Florida. Retrieved from http://entnemdept.ufl.edu/creatures/urban/spiders/common_house_spider.htm
Barnes, JK. 2003. Common house spider. University of Arkansas Arthropod Museum. Retrieved from http://www.uark.edu/ua/arthmuse//achaeara.html
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| Ventral side of a female Latrodectus hesperus |
Genus Latrodectus
Species Hesperus
Common Name: Western Black Widow
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