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Species Araneus gemma

In Retreat B face detail - Araneus gemma - female Unidentified spider, Santa Barbara County, California - Araneus gemma orb - Araneus gemma voucher image - Araneus gemma - male voucher image - Araneus gemma - male Spider - Araneus gemma Spider found in Acton, CA, Los Angeles County, about 2,300 in elevation - Araneus gemma Araneus sp - Araneus gemma - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Araneidae (Orb Weavers)
Genus Araneus
Species gemma (Araneus gemma)
Synonyms and other taxonomic changes
Explanation of Names
Latin for "bud" or "gem"
Size
The female measures 10 to 12mm* long; male smaller than the female, measuring 6 to 8 mm long (1)
(*according to BugGuide records the female may be as large as 23 mm)
Identification
Female: carapace and abdomen vary in color from gray to brownish purple. The abdomen has anterior paired humps and may have a medial light stripe that varies in length.




Male: similar in color and pattern to the female.

Range
Along the West coast of North America from southern Alaska to southern California and inland to western Montana. 1
Habitat
Builds web in open areas of trees, large shrubs and around houses.
Remarks
This species is thought to mate with A. gemmoides which creates a cross between those two species.
See Also
Araneus andrewsi has mottled brown abdomen; usually does not have the medial brown stripe on the abdomen.
Neoscona crucifera is more orange-brown, no abdominal medial stripe and no paired humps
Eriophora ravilla - This species also has a brown form with a central dorsal white line.
Works Cited
1.The Orb-weaving Spiders of Canada and Alaska - The Insects and Arachnids of Canada Part 23
Dondale, C.D., J.H. Redner, P, Paquin and H.W. Levi. 2003. NRC Research Press.