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Observed at human night-time.
Saw 6 of them, all between 0.5-0.7cm.
Were close to the entrance, no further than half-way of the cave. Mud, stalagmites, broken stalactites and rest of the hardscape help these tiny pods to blend well.
Will comfortably stay longer than 4mins curled if you disturb them.

The stream that runs through the cave runs through a narrow channel in the floor. In part, the channel is full of rotting wood. This bug emerged from the rotting wood and walked along the wall next to the stream. When I tried to maneuver it into a better position for a photograph, it initially tried to hide in a crevice. When that did not work, it ran down the cave wall into the stream and stayed under the water for about 2 minutes before emerging. Another larger version of the same isopod species ran past while I was trying to photograph this one.

Comparison of paratype on right, with Cirolanides texensis on left. Species discovered by Zachary Schwartz in 2014. Second photo is a negative image to highlight and illustrate different body parts more clearly.

doi.org/10.11646/zootaxa.4543.4.2