Found underneath loose bark on the main trunk, 20m up in a tree. Others noted that they were found underneath trunk bark at ground level as well.
Porcellionides cavernarum (Vandel, 1958): https://database.inspee.gr/fauna/browse/Animalia/Arthropoda/Malacostraca/Isopoda/Porcellionidae/Porcellionides/Porcellionides%20cavernarum