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Dolomedes tenebrosus, the dark fishing spider, is a spider in the family Pisauridae. It inhabits wetlands and moist forests in northeastern North America (Carico 1973). This is one of the largest spiders in the region. Females are larger than males. They are 15-40 mm in length and their slender legs can be up to 100 mm long (Gaddy 2009). Individuals can often be found on tree trunks or logs near ponds and streams. Like other fishing spiders they may venture out on the water surface to catch insects, and there are even reports that they occasionally prey on small fish (Barbour 1921). But this species is not restricted to aquatic habitats. It also occurs in hardwood forests quite a distance away from any body of water (Carico 1973, Gaddy 2009). While these spiders can often be seen at any time of the day, they are most active at night. The best places to find them during the day are tree cavities and crevices in stumps and logs (Gaddy 2009).