†suborder Phreatoicidea Stebbing 1893 (isopod)
Parent taxon: Isopoda according to F. R. Schram 1980
See also Schram 1974
Sister taxa: Aegidae, Anthuridea, Asellota, Branchipodites, Elioserolis, Eocopea, Flabellifera, Gnathiidae, Gnathiidea, Oniscidae, Oniscidea, Saduria, Scutocoxifera, Sphaeromatidea, Triassphaeroma, Urdidae, Valvifera
Subtaxa: Amphisopidae Palaeophreatoicidae
Ecology: epifaunal omnivore
Distribution:
• Triassic of China (1 collection)
• Permian of Germany (2), the Russian Federation (1), the United Kingdom (3)
• Carboniferous of United States (1: Illinois)
Total: 8 collections each including a single occurrence