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Species Dolomedes tenebrosus

Fishing Spider - Dolomedes tenebrosus - female found inside my home - Dolomedes tenebrosus - female Dolomedes tenebrosus? - Dolomedes tenebrosus Dolomedes tenebrosus? - Dolomedes tenebrosus Male fishing spider - Dolomedes tenebrosus - male What type of spider is this? - Dolomedes tenebrosus Spider - Dolomedes tenebrosus Immature Dolomedes tenebrosus - Dolomedes tenebrosus - female
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Pisauridae (Nursery Web Spiders)
Genus Dolomedes (Fishing Spiders)
No Taxon (tenebrosus group)
Species tenebrosus (Dolomedes tenebrosus)
Synonyms and other taxonomic changes
Explanation of Names
Latin: "dark, gloomy"
body length of female 15-26 mm, of male, 7-13 mm
Brownish to gray with few white marks, dark W-shaped marks on dorsal surface of abdomen.

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.

Dolomedes scriptus

Dolomedes tenebrosus

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

Dolomedes tenebrosus

Female epigynum
Eastern North America: southeastern Canada south to Florida, west to North Dakota, Texas.
Bushes, rocks, etc., near permanent bodies of water, sometimes in dry woodlands.
Life Cycle
A youtube video of the male and female mating can be seen here.
A study by Schwartz, Wagner & Hebets, August 2013, has found that during mating the male of this species dies. The paper can be found here.
Print References
Howell and Jenkins, pp. 224-225, fig. 137 (2)
Kaston, p. 179, fig. 451 (3)
The Neartic Species of the Genus Dolomedes (Araneae: Pisauridae)(1)
Works Cited
1.The Neartic Species of the Genus Dolomedes (Araneae: Pisauridae)
James Edwin Carico. 1973. Bulletin of the Museum of Comparative Zoology, Harvard University, Vol. 144, No. 7 Cambridge, Mass., March 13.
2.Spiders of the Eastern US, A Photographic Guide
W. Mike Howell and Ronald L. Jenkins. 2004. pearson education.
3.How to Know the Spiders
B. J. Kaston. 1978. WCB/McGraw-Hill.