That I believe to be a roach/pill bug hybrid. Pill bugs are amphibious, that thing is flatter and moves quicker than a pill bug I know this. To leave whatever body of water in abnormal for pill bug. It is not any shade of gray, has either a milky or transparent yellow color yes? Enhanced speed, flat body, and it DOES NOT roll into a ball yet it is segmented. It is a new hybrid species, I have been looking for a confirmation that these "hybrids"existed else where and were not a mere illusion of the mind, note I can further my research.