Sierwald et al. (2005) report 900 species of spiders (Araneae) for the five-state region of Wisconsin, Michigan, Ohio, Indiana, and Illinois, with a low of 383 for Indiana and a high of 646 for Illinois. The authors' predicted species richness for the five states ranges from 546 species for Wisconsin to 682 for Illinois. It is not unreasonable to assume that a similar list for South Dakota would be within this range (see Patrick 2010). More information about the state's physiographic regions and habitats can be found at the Natural Source, an educator's guide to to South Dakota's natural resources.
Click on the BugGuide (BG) links to view specimen photos of recorded specimens (when available) or representative images.
A handful of species can be recognized by appearance, particularly from very good photographs, but to make a determination to species, most need to be examined under a microscope. For more information, you are welcome to visit the spider forum at BugGuide. If you are interested in adding to this list and wish to collect or submit specimens -- or have a correction or other inquiry -- please contact the author.
With this version (1 February 2012) the number of species increases to 202; this is a result of additional references found in the literature and summer collecting in the Spearfish Canyon and Rapid City regions. A PDF version of the checklist is available here: Spiders of South Dakota - Species Checklist
Pfeiffer, Kevin M. Spiders of South Dakota: Species checklist (Araneae). 1 February 2012. Archived by WebCite at:http://www.webcitation.org/66BNhrMNl (15 March 2012).