Other Common Names
Cross Spider, Cross Orbweaver, European Garden Spider
Body length adult female: 6-20mm.
Body length adult male: 6-13mm.
The dorsal, white cross on the abdomen can typically be diagnostic:
There is also an atypical variation that does not have the cross. This might be confused with A. gemma. See atypical diadematus here:
Mostly southern Canada and the northern 1/3 of the USA (now including northern California). Uncommon in the Great Plains area.
Common in gardens, though it is more a species of scrubby heathland or amongst gorse.
Shriveled Female and egg sac:
Mature male, immature female:
Males reach sexual maturity before females do, and will often pair off with an immature female in order to claim her.
Introduced to North America from Western and Northern Europe.
Dondale, C. D., J. H. Redner, P. Paquin & H. W. Levi. 2003. The insects and arachnids of Canada. Part 23. The orb-weaving spiders of Canada and Alaska (Araneae: Uloboridae, Tetragnathidae, Araneidae, Theridiosomatidae). NRC Research Press, Ottawa, 371 pp.