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Species Dolomedes vittatus

Dolomedes vittatus spider - Dolomedes vittatus - female Dolomedes sp. - Dolomedes vittatus  Dolomedes? - Dolomedes vittatus Fishing Spider - Dolomedes vittatus Large spider ident needed   - Dolomedes vittatus Dolomedes - Dolomedes vittatus Possible (Dolomedes vittatus) juveniles - Dolomedes vittatus
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