{{Short description|Extinct genus of Desmostylidae mammals}} {{Speciesbox | fossil_range = Late Oligocene | image = | image_caption = | genus = Cornwallius | parent_authority = {{Harvnb|Hay|1923}} | species = sookensis | authority = ({{Harvnb|Cornwall|1922}}) }}
'''''Cornwallius''''' is an extinct herbivorous marine mammal of the family Desmostylidae. ''Cornwallius'' lived along the North American Pacific Coast from the Early Oligocene (Chattian) into the Early Miocene (28.4 mya—20.6 Mya) and existing for approximately {{Mya|28.4-20.6|million years}}.<ref>{{Paleodb|36957|Cornwallius}}. Retrieved 16 June 2013.</ref><ref name="Paleodb-Muir-Creek">{{Paleodb|collection|63086|Muir Creek (Oligocene of Canada)}}. Retrieved 16 June 2013.</ref>
The type locality is the Chattian Sooke Formation, Vancouver Island, British Columbia, Canada ({{Coord|48.4|-123.9|display=inline}}, paleocoordinates {{Coord|48.0|-115.0|display=inline}}).<ref name="Paleodb-Muir-Creek" />
''Cornwallius'' was named by {{Harvnb|Hay|1923}}. Its type is ''Desmostylus sookensis'', named by {{Harvnb|Cornwall|1922}} and recombined to ''Cornwallius sookensis'' by {{Harvnb|Hay|1923}}.<ref>{{Paleodb|72051|Cornwallius sookensis}}. Retrieved 16 June 2013.</ref>
Fossils have been discovered from Baja California Peninsula, Oregon and Washington coasts, and Unalaska Island.<ref>{{Harvnb|Beatty|2006b}}</ref>
==Notes== {{Reflist}}
==References== {{Refbegin}} * {{Cite journal | last = Beatty | first = Brian Lee | title = Rediscovered specimens of ''Cornwallius'' (Mammalia, Desmostylia) from Vancouver Island, British Columbia, Canada | year = 2006a | journal = Vertebrate Palaeontology | volume = 1 | issue = 1 | pages = 1–6 | url = http://www.palarch.nl/wp-content/beatty_bl_rediscovered_specimens_of_cornwallius_mammalia_desmostylia_from_vancouver_island_british_columbia_canada_palarchs_journal_of_vertebrate_palaeontology_1_1_2006.pdf | access-date = 16 June 2013 }}<!-- {{Harvnb|Beatty|2006}} -->{{deadlink|date=October 2025}} * {{Cite journal | last = Beatty | first = Brian Lee | title = Specimens of ''Cornwallius sookensis'' (Desmostylia, Mammalia) from Unalaska Island, Alaska | year = 2006b | journal = Journal of Vertebrate Paleontology | volume = 26 | issue = 3 | pages = 785–87 | jstor = 4524623 | doi=10.1671/0272-4634(2006)26[785:socsdm]2.0.co;2| s2cid = 85919379 }}<!-- {{Harvnb|Beatty|2006}} --> * {{Cite journal | last = Cornwall | first = I. E. | title = Some Notes on the Sooke Formation, Vancouver Island, B.C. | year = 1922 | journal = Canadian Field-Naturalist | volume = 36 | issue = 7 | pages = 121–23 | doi = 10.5962/p.338167 }}<!-- {{Harvnb|Cornwall|1922}} --> * {{Cite journal | last = Hay | first = O. P. | authorlink = Oliver Perry Hay | title = Characteristics of sundry fossil vertebrates | year = 1923 | journal = Pan-American Geologist | volume = 39 | pages = 101–20 | oclc = 38855496 }}<!-- {{Harvnb|Hay|1923}} --> {{Refend}}
{{Portal|Paleontology}} {{Paenungulata}} {{Taxonbar|from2=Q5172044|from1=Q18579130}}
Category:Desmostylians Category:Prehistoric placental genera Category:Fossil taxa described in 1923 Category:Oligocene mammals of North America
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