Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Calendar
Upcoming Events

Information about the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa


Araneus marmoreus -pyramidatus variation. Is it exclusively Northern?

According to various websites there are two variations of patterning for marbled spiders Araneus marmoreus ,the wavy foliate patterning (nominate marmoreus) which is most common in North America, and a “variation pyramidatus” pattern with a single large black diamond on the rear of the abdomen in an otherwise unmarked background, for example

The pyramidatus pattern is rare in North America and is found primarily in Europe (see for example http://animaldiversity.org/accounts/Araneus_marmoreus/ ). I recently found what I think is the pyramidatus version in Quebec, which prompted me to check the Bugguide web site for other examples. It turns out that in 22 pages of images there are only 14 examples of the pyramidatus variant. All of them are either in Canada or Alaska. None of the web sources I tracked down discusses the distribution of the pyramidatus variant in North America, but I think the distribution is too clear cut to be in any way random. Is it a ‘known fact’ that the pyramidatus variant partitions to the North?

Pyramidatus variants in Bugguide are from:
Palmer, Alaska.
Anchorage, Alaska.
Kenai Peninsula County, Alaska.
Whitecourt, Alberta, - five different entries.
Edmundston, New Brunswick.
Stewiacke, Nova Scotia.
Sarsfield, Ontario.
St Bruno, Quebec.
White Fox, Torch River, Saskatchewan- two different entries.

The common nominate variant ((foliate patterning) is recorded in Bugguide for all Eastern US states except Florida, Mississippi, and Louisiana. It is also in California and Washington State.

marmoreus variation
Hi Andrew, your profile doesn't have any contact info; can you share your email, or else contact me at upsara_8159 [at] hotmail [dot] com (no spaces)? I didn't want to say much publicly because some arachnologists are working on this right now. Needless to say, you noticed something important. :-)

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.