Nursery Web Spider? With egg case
Location: Central Illinois
June 20, 2011 9:21 pm
This beautiful spider was found on the bottom on a mower that was sitting in a grass area next to a forest. We think it’s some kind of nursery web spider but would like a positive ID. Thanks in advance for your help.
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Signature: Spider Fan
Dear Spider Fan,
You are correct that this is a Nursery Web Spider in the family Pisauridae, and we can guarantee, at least based upon the currently accepted taxonomy, that this is a Fishing Spider in the genus Dolomedes. Furthermore, we believe it is most likely Dolomedes tenebrosus, based on images and information posted on BugGuide. To try to further clarify things, all members in the family Pisauridae are called Nursery Web Spiders because of the maternal care given to the eggs and spiderlings. After carrying around her egg sac for some time, the female will find an appropriate location and there she will construct the nursery web and she will continue to guard her eggs and hatchlings. Members of the genus Dolomedes are called Fishing Spiders because many are found in close proximity to water and some are even capable of diving beneath the surface of the water and capturing aquatic prey. They can also run across the surface of the water.