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TaxonomyBrowse
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Species Dolomedes vittatus

fishing spider - Dolomedes vittatus - female Spider 5 - Dolomedes vittatus Amherst D. vittatus - Dolomedes vittatus Large Spider - Dolomedes vittatus Fishing spider? - Dolomedes vittatus brown spider - Dolomedes vittatus Dolomedes vittatus  - Dolomedes vittatus Nursery web/fishing spider - Dolomedes vittatus - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynes )
Family Pisauridae (Nursery Web Spiders)
Genus Dolomedes (Fishing Spiders)
Species vittatus (Dolomedes vittatus)
Synonyms and other taxonomic changes
Identification
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.

Here are some images from the Guide that might help clarify some of this:

Dolomedes vittatus


Dolomedes scriptus


Hope that helped a little...Brett Tyler, 31 December, 2008