Desmostylidae Temporal range: Early Oligocene to Miocene, 33.9–7.2 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Desmostylus, Royal Ontario Museum
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	†Desmostylia
Family:	†Desmostylidae Osborn 1905

Desmostylidae is an extinct family of herbivorous marine mammals belonging to the order of Desmostylia. They lived in the coastal waters of the northern Pacific Ocean from the Early Oligocene (Rupelian) through the Late Miocene (Tortonian) (33.9 mya—7.2 MYA) ^[1][2] existing for approximately 26.7 million years.

Desmostylidae was named by Osborn 1905. It was assigned to Sirenia by Osborn (1905); to Proboscidea by Abel (1919); to Desmostyliformes by Simpson (1932), Kretzoi (1941) and Reinhart (1959); to Desmostylia by McKenna and Bell (1997); and to Desmostylia by Carroll (1988), Inuzuka et al. (1995), Inuzuka (2000) and Barnes and Goedert (2001).^[1]

Cockburn & Beatty 2009 found a subadult specimen of Behemotops proteus on Vancouver Island in 2007. They noted that (1) the cranial features of their specimen were similar to those of Cornwallius and that (2) the adult dentition was not delayed in their specimen, unlike in Desmostylus and other Afrotheria, and they concluded that (1) Desmostylidae and Paleoparadoxiidae probably diverged earlier than previously believed and that (2) delayed dentition can not be the most primitive state of Desmostylia.^[3]

Classification after Chiba 2016:^[2]

• †Desmostylidae:
  • †Cornwallius
  • †Behemotops
  • †Desmostylus
  • †Kronokotherium
  • †Ounalashkastylus

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