Alternative spelling: Mesonychoidea
Parent taxon: Acreodi according to R. Tabuce et al. 2011
See also Carroll 1988, Geisler and McKenna 2007, Gingerich 1982, Szalay and Gould 1966 and Thewissen et al. 2001
Sister taxa: Andrewsarchus, Mondegodon, Oxyclaenidae, Triisodontidae
Subtaxa: Andrewsarchidae Hapalodectidae Mesonychidae Simidectes Wyolestes Wyolestidae
Ecology: scansorial omnivore
Distribution:
• Oligocene of China (2 collections)
• Eocene to Oligocene of North Korea (1)
• Eocene of Belgium (1), Canada (2: Northwest Territories, Saskatchewan), China (17), France (9), Kyrgyzstan (1), Mexico (1), Mongolia (4), North Korea (1), Pakistan (2), Spain (2), the United Kingdom (1), United States (157: California, Colorado, New Mexico, Oregon, Texas, Utah, Wyoming)
• Paleocene of Canada (2: Alberta), China (17), France (2), Mongolia (3), United States (52: California, Colorado, Montana, New Mexico, North Dakota, Wyoming)
Total: 277 collections including 322 occurrences