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.^{[2][3][4][5][6][7][excessive citations]}

Xenorophidae Temporal range: 30–23.03 Ma PreꞒ Ꞓ O S D C P T J K Pg N Oligocene^[1]
Cotylocara
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Artiodactyla
Infraorder:	Cetacea
Parvorder:	Odontoceti
Family:	†Xenorophidae Uhen, 2008
Genera
Albertocetus Archaeodelphis Cotylocara Echovenator Inermorostrum Mirocetus Xenorophus

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

References

1. "Xenorophidae". paleobiodb.org.
2. 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
3. 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
4. R. Kellogg. 1923. Description of an apparently new toothed cetacean from South Carolina. Smithsonian Miscellaneous Collections 76(7):1-7
5. G. M. Allen. 1921. A new fossil cetacean. Bulletin of the Museum of Comparative Zoology 65(1):1-14
6. 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.
7. 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.