Ontocetus emmonsi Leidy 1859 (walrus)

Mammalia - Carnivora - Odobenidae

Alternative combinations: Hoplocetus emmonsi, Ontocetus emmonsii

Synonyms: Alachtherium africanum Geraads 1997, Alachtherium antverpiensis Rutten 1907, Alachtherium antwerpiensis Hasse 1909, Alachtherium crestsii Du Bus 1867, Alachtherium cretsii Du Bus 1867, Odobaenus huxleyi Lankester 1865, Odobenus africanus Geraads 1997, Odobenus antverpiensis Rutten 1907, Odobenus cretsii Du Bus 1867, Odobenus huxleyi Lankester 1865, Prorosmarus alleni Berry and Gregory 1906, Trichechus antverpiensis Rutten 1907, Trichechus huxleyi Lankester 1865, Trichecodon huxleyi Lankester 1865

Full reference: J. Leidy. 1859. [Remarks on Dromatherium sylvestre and Ontocetus emmonsi]. Proceedings of the Academy of Natural Sciences of Philadelphia 1859:162

Belongs to Ontocetus according to I. Magallanes et al. 2018

See also Albright et al. 2019, Barnes 1989, Barnes 2008, Berry and Gregory 1906, Berta et al. 2018, Boessenecker et al. 2018, Bosscha Erdbrink and Van Bree 1999, Cope 1875, Deméré 1994, Deméré et al. 2003, Du Bus 1867, Geraads 1997, Hasse 1909, Hay 1902, Hay 1930, Kellogg 1922, Kohno and Ray 2008, Lankester 1865, Leidy 1859, Leidy 1869, Newton 1891, Palmer 1904, Post 2004, Ray 1975, Repenning and Tedford 1977, Rutten 1907, Trouessart 1898, Trouessart 1904, Van Deinse 1964, Van Der Feen 1968, Vanden Broeck 1874 and Werdelin and Peigne 2010

Sister taxon: Trichecodon koninckii

Type specimens:

  • Ontocetus emmonsi: USNM 329064, a tooth (tusk). Its type locality is Murfreesboro, which is in a Zanclean shallow subtidal sandstone in the Yorktown Formation of North Carolina.
  • Alachtherium africanum: AaO-30392.
  • Alachtherium antverpiensis: IRSNB M.169, a partial skull. Its type locality is Heyst, which is in a Calabrian marine horizon in Belgium.
  • Alachtherium antwerpiensis: IRSNB M.404. Its type locality is Steenborgerweert, which is in a Pliocene coastal sandstone in Belgium.
  • Alachtherium cretsii: IRSNB M.168. Its type locality is Anvers, Lillo Formation, which is in a Piacenzian offshore sandstone in the Lillo Formation of Belgium.
  • Prorosmarus alleni: USNM 9343. Its type locality is Yorktown, which is in a Zanclean/Piacenzian marine horizon in the Yorktown Formation of Virginia.
  • Trichecodon huxleyi: NHM 46000. Its type locality is Felixstow, which is in a Gelasian foreshore horizon in the Red Crag Formation of the United Kingdom.

Ecology: amphibious carnivore


• Quaternary of the Netherlands (2 collections), the United Kingdom (1), United States (6: Florida, Georgia, South Carolina)

• Blancan of United States (1: Florida)

• Pliocene to Pleistocene of United States (1: Georgia)

• Pliocene of United States (25: Florida, North Carolina, South Carolina, Virginia)

• Hemphillian of United States (1: Florida)

• Miocene to Pleistocene of the Netherlands (1)

• Neogene of United States (3: Florida, Georgia)

Total: 41 collections each including a single occurrence

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Specimen images are retrieved through the ePANDDA API.

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