HELP. spider identification?!?!?

k. so there's a huge spider in my basement,
it's all brown except the back.
i live in michigan.
the back is black and white.
weirdish pattern. kind of looked like a turtle back. but i don't know.
it has small fangs?
and it looks kinda crumply, like big legs.

what is it?
HELP please?
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