Hello. We found a rather scary insect in our bathroom.

It looks like a centipede but with a plated, very flat body, many long legs (longer and more angular at the back seen at the top of the image)... It moved in a fast, liquid way. It was probably about 3" long.

I live in Portland Oregon and found it at night hiding in a dark place. I'd like to know what it is, if it's common (I've never seen anything like it), and if it's venomous.

Thanks!

Here is a link that might be useful: {{!gwi}}