Can a wood louse spider be dark all over?

I live in Howell, MI, USA and I caught a spider in my apartment last night and am trying to identify it. I'm a little perplexed. It's body design is telling me it's a wood louse spider; however all the pics I've found on the net are light colored or very red.

It is very dark (almost black) all over approximately 1/4" long. The abdomen (large, elongated at least twice as long as it's carapace) does have a bit of velvety sheen to it with a few faint markings that seem beige in color and the spinnerets are quite visible. The legs seem a bit short for the body size. (in my opinion anyway) Which to me would rule out a funnel weaver/grass spider or a parsons spider.

I did notice this morning that it's dark legs do have a hint of burgundy. She (I believe) also made a bit of a sheet web in the large container I have her in.

I usually let spiders roam free in my home but I wasn't sure about this one.

I'd appreciate any help in the proper ID of this arachnid. (unfortunately all of my field guides are somewhere in storage and I'm a bit lost without them.)

PS
Thanks for your website, it's a great resource!