Synonyms and other taxonomic changes
Explanation of Names
Dolomedes scriptus Hentz, 1845
Scriptus is Latin for "written". Usually indicates markings that look like writing. Probably referring to the "W" shaped marks on the abdomen.
Distinguishing Dolomedes vittatus from Dolomedes scriptus males can be rather tricky at times, so here's a couple physical characteristics that I use to tell the two apart:
1.) Generally, the abdominal markings of adult male D. scriptus have a more "sculptured" appearance, whereas D. vittatus have less-pronounced markings.
2.) The two dark-colored spots in the middle of the cephalothorax are almost always more robust in D. vittatus than the more narrow ones found on D. scriptus.
(Brett Tyler, 31Dec2008)
Here are some images from the Guide that might help clarify some of this:
The main difference between scriptus and tenebrosus is that the 'W' pattern on scriptus is outlined in white all the way across the abdomen. The pattern in tenebrosus is broken.. and it generally has less white. It also appears that scriptus has a fuller and more complete median carapace stripe.
Additionally Dolomedes tenebrosus
features an inverted "v shaped" black mark beginning at the AME extending to the edge of the clypeus enclosing a light spot on the anteromedial margin compared to Dolomedes scriptus
which is dark only around each eye with a homogenous medium gray clypeus(1)
Dolomedes scriptus is widely distributed in eastern North America.
Most often found at fast flowing streams.
Carico, J. E., 1973. The Nearctic species of the genus Dolomedes (Araneae: Pisauridae). Bulletin Museum of Comparative Zoology Harvard 144: 435-488. (Species Description Here
Hentz, N. M. (1845). Descriptions and figures of the araneides of the United States. Boston Journal of Natural History 5(2): 189-202, pl. 16-17. (Original Description