Hyloniscus riparius

Have you ever wanted to keep a terrestrial isopod under water for 8 weeks? I hope not, but you could with this one. The riparian woodlouse was first found in North America in 1951 after being brought over from Europe and has since spread out from the northeast. Like the rest of the genus, it only has one ocellus for each eye. They get their names from hanging out in riparian zones ("the interface between land and a river or stream and/or floodplains") and don't last long without sufficient moisture. Their spread also still seems to be very much ongoing.

My experience

I flipped over a piece of wood right next to the stream by my apartment and saw two individuals of this species running around. At first I thought they were more M. medcofi, but noticed the differences once I got pictures and zoomed in. They're super fast. Also, there have only been 9 sightings recorded on inaturalist including my own. Neat find.