Xenorophidae

Xenorophidae is an extinct family of odontocetes currently known from the Oligocene of the southeastern US. Known genera of xenorophids include Albertocetus, Archaeodelphis, Cotylocara, Echovenator, Inermorostrum, and Xenorophus.[1][2][3][4][5][6]

Albertocetus reconstruction outline, showing known bones in red. From Boessenecker et al. 2017

Xenorophidae Temporal range: Oligocene PreꞒ Ꞓ O S D C P T J K Pg N
Cotylocara
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Artiodactyla
Infraorder:	Cetacea
Parvorder:	Odontoceti
Family:	†Xenorophidae Uhen, 2008
Genera
Albertocetus Archaeodelphis Cotylocara Echovenator Inermorostrum Xenorophus

References

1. M. D. Uhen. 2008. A new Xenorophus-like odontocete cetacean form the Oligocene of North Carolina and a discussion of the basal odontocete radiation. Journal of Systematic Palaeontology 6(4):433-452
2. Jonathan H. Geisler, Matthew W. Colbert, James L. Carew. A new fossil species supports an early origin for toothed whale echolocation. Nature, 2014; doi: 10.1038/nature13086
3. R. Kellogg. 1923. Description of an apparently new toothed cetacean from South Carolina. Smithsonian Miscellaneous Collections 76(7):1-7
4. G. M. Allen. 1921. A new fossil cetacean. Bulletin of the Museum of Comparative Zoology 65(1):1-14
5. Morgan Churchill; Manuel Martinez-Caceres; Christian de Muizon; Jessica Mnieckowski; Jonathan H. Geisler (2016). "The Origin of High-Frequency Hearing in Whales". Current Biology. in press. doi:10.1016/j.cub.2016.06.004.
6. Jonathan H. Geisler; Robert W. Boessenecker; Mace Brown; Brian L. Beatty (2017). "The Origin of Filter Feeding in Whales". Current Biology. 27 (13): 2036–2042.e2. doi:10.1016/j.cub.2017.06.003.