Dolomedes tenebrosus
(Dark Fishing Spider)

Picture ID 54493

Picture of Dolomedes tenebrosus (Dark Fishing Spider) - Lateral

Comments & ID Thoughts

My guess is this is Dolomedes tenebrosus (dark fishing spider), 2.5" leg span so presumably a female? Most spiders don't find enough to eat in my basement so surprised to find this large healthy specimen in March.

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RjbCalumEwing Recent comment authors
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CalumEwing
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Yes, it is a female. The other large Dolomedes in your area is D. scriptus. Both are a bit variable in how brightly patterned they are and how dark overall. If you can get a look at one from front on, D. tenebrosus has a small vertical white mark between and above the jaws (like a little white moustache) and D. scriptus does not have the white mark in the centre.

Additional Pictures

Picture of Dolomedes tenebrosus (Dark Fishing Spider) - Dorsal Enlarge Picture
Picture of Dolomedes tenebrosus (Dark Fishing Spider) - Dorsal Enlarge Picture
Picture of Dolomedes tenebrosus (Dark Fishing Spider) - Dorsal Enlarge Picture
Picture of Dolomedes tenebrosus (Dark Fishing Spider) - Dorsal Enlarge Picture