†order Desmostyloidea Abel 1933 (desmostylian)
Parent taxon: Desmostylia according to K. Matsui and T. Tsuihiji 2019
See also Domning 1996 and Matsui and Pyenson 2023
Sister taxa: Behemotops, Cornwalliidae, Jamilcotatus, Kronokotherium, Seuku
Subtaxa: Desmostylidae Paleoparadoxiidae
Ecology: amphibious herbivore
Distribution:
• Neogene of Japan (1 collection)
• Miocene of Japan (72), Mexico (4), the Russian Federation (10), United States (61: Alaska, California, Oregon, Washington)
• Arikareean of Mexico (1), United States (2: California, Oregon)
• Oligocene to Miocene of Japan (2)
• Oligocene of Canada (3: British Columbia), Japan (1), Mexico (3), United States (6: Alaska, Oregon, Washington)
Total: 166 collections including 189 occurrences