Alternative spellings: Mesonychoidae, Mesonychoidea
Parent taxon: Acreodi according to R. Tabuce et al. 2011
See also Carroll 1988, Geisler and McKenna 2007, Gingerich 1982, Hay 1930, 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)
• Clarkforkian of United States (27: Colorado, Montana, Wyoming)
• Paleocene of Canada (2: Alberta), China (17), France (2), Mongolia (3), United States (25: California, Colorado, Montana, New Mexico, North Dakota, Wyoming)
Total: 277 collections including 322 occurrences