PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Cornwallius

Mammalia - Perissodactyla - Desmostylidae

Taxonomy

Cornwallius was named by Hay (1923) [Sepkoski's age data: T Ol-u]. Its type is Paleoparadoxia tabatai. It was considered monophyletic by Beatty (2009).

It was assigned to Cornwalliidae by Shikama (1966); to Desmostylia by Domning et al. (1986), Domning (1996), Sepkoski (2002) and Domning (2008); to Desmostylia by Berta (2017); and to Desmostylidae by Hay (1930), VanderHoof (1937), Kretzoi (1941), VanderHoof (1942), Reinhart (1959), Carroll (1988), Inuzuka et al. (1995), McKenna and Bell (1997), Inuzuka (2000), Beatty (2009), Domning (2018), Matsui and Tsuihiji (2019) and Beatty (2023).

Species

C. sookensis

Synonymy list

Year	Name and author
1923	Cornwallius Hay p. 107
1930	Cornwallius Hay p. 654
1937	Cornwallius VanderHoof p. 191
1941	Cornwallius Kretzoi p. 155
1942	Cornwallius VanderHoof p. 301
1959	Cornwallius Reinhart p. 66
1966	Cornwallius Shikama p. 155
1986	Cornwallius Domning et al. p. 36 figs. Fig. 22
1988	Cornwallius Carroll
1995	Cornwallius Inuzuka et al. p. 524
1996	Cornwallius Domning p. 324
1997	Cornwallius McKenna and Bell p. 375
2000	Cornwallius Inuzuka p. 93
2002	Cornwallius Sepkoski
2008	Cornwallius Domning p. 642
2009	Cornwallius Beatty
2017	Cornwallius Berta p. 171
2018	Cornwallius Domning p. 251
2019	Cornwallius Matsui and Tsuihiji p. 11
2023	Cornwallius Beatty

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
subclass	Synapsida
—	Therapsida	()
infraorder	Cynodontia	()
—	Mammaliamorpha
—	Mammaliaformes

Rank	Name	Author
class	Mammalia
—	Theriamorpha	(Rowe 1993)
—	Theriiformes	()
—	Trechnotheria
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Panperissodactyla
superorder	Perissodactylamorpha
order	Perissodactyla	()
order	Desmostylia
order	Desmostyloidea	Abel 1933
family	Desmostylidae
genus	Cornwallius

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

G. †Cornwallius Hay 1923

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†Cornwallius sookensis Cornwall 1922

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

hydroxyapatiteo

Ontogeny:

modification of partso

Environment:

coastalo

Locomotion:

actively mobileo

Life habit:

amphibiouso

Diet:

herbivoreo

Reproduction:

viviparouso

Created:

2005-09-11 17:03:02

Modified:

2019-05-28 17:19:55

Source: o = order

Reference: Domning et al. 1986

Age range: Chattian or 28.10000 to 23.03000 Ma

Collections (11 total)

Time interval	Ma	Country or state	Original ID and collection number
Arikareean	29.5 - 18.5	Mexico (Baja California Sur)	C. sookensis (90463)
Late/Upper Oligocene	28.4 - 23.03	USA (Oregon)	C. sookensis (91211)
Late/Upper Oligocene	28.4 - 23.03	USA (Alaska)	C. sookensis (91213)
Chattian	28.1 - 23.03	USA (Oregon)	C. sookensis (45782 45788)
Chattian	28.1 - 23.03	Mexico (Baja California Sur)	C. sookensis (66429) C. sp. (66427 66428)
Chattian	28.1 - 23.03	Canada (British Columbia)	C. sookensis (91214) Desmostylus hesperus (63086) Desmostylus sookensis (63087)