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Species Araneus gemma

Araneus gemma Full Ventral - Araneus gemma - female Spider - Araneus gemma Unidentified spider, Santa Barbara County, California - Araneus gemma Araneus gemma? - Araneus gemma - male Red Bearded Orb Weaver - Araneus gemma - female voucher image - Araneus gemma - female spider - Araneus gemma
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"
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)
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.

Western Montana west to British Columbia and south to California (1)
Builds web in open areas of trees, large shrubs and around houses.
This species is thought to mate with A. gemmoides which creates a cross between those two species. [This needs a citation.]
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.