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Species Dolomedes tenebrosus

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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 tenebrosus (Dolomedes tenebrosus)
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.

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 (1)
Kaston, p. 179, fig. 451 (2)
Works Cited
1.Spiders of the Eastern US, A Photographic Guide
W. Mike Howell and Ronald L. Jenkins. 2004. pearson education.
2.How to Know the Spiders
B. J. Kaston. 1978. WCB/McGraw-Hill.