PBDB Taxon

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Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Oldfieldthomasiidae

Osteichthyes - Notoungulata - Oldfieldthomasiidae

Taxonomy

Oldfieldthomasiidae was named by Simpson (1945). It is not extant. Its type is Oldfieldthomasia.

It was assigned to Typotheria by Simpson (1967); to Notoungulata by Simpson et al. (1962), Marshall and de Muizon (1983); and to Toxodontia by Carroll (1988).

Subtaxa

Brachystephanus, Camargomendesia, Colbertia, Dolichostylodon, Itaboraitherium, Kibenikhoria, Maxschlosseria (syn. Paracoelodus), Oldfieldthomasia (type genus), Paginula, Suniodon, Tsamnichoria, Ultrapithecus, Xenostephanus

Synonyms

Acoelodidae was named by Ameghino (1901). Its type is Acoelodus.

It was synonymized subjectively with Oldfieldthomasiidae by Simpson (1967).

It was assigned to Hyracoidea by Ameghino (1901); and to Typotheria by Simpson (1934), Simpson (1935).

Synonymy list

Year	Name and author
1901	Acoelodidae Ameghino p. 364
1934	Acoelodidae Simpson
1935	Acoelodidae Simpson p. 16
1945	Oldfieldthomasiidae Simpson
1962	Oldfieldthomasiidae Simpson et al.
1967	Oldfieldthomasiidae Simpson
1983	Oldfieldthomasiidae Marshall and de Muizon p. 151
1988	Oldfieldthomasiidae Carroll

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

Rank	Name	Author
—	Therapsida	()
infraorder	Cynodontia	()
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
superorder	Afrotheria
—	Paenungulatomorpha
superorder	Paenungulata
—	Sudamericungulata
order	Notoungulata
family	Oldfieldthomasiidae	Simpson 1945
family	Oldfieldthomasiidae	Simpson 1945

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.

Fm. †Oldfieldthomasiidae Simpson 1945

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G. †Brachystephanus Simpson et al. 1962

†Brachystephanus postremus Simpson et al. 1962

G. †Camargomendesia Paulo Couto 1978

G. †Colbertia Paula Couto 1952

†Colbertia falui Fernández et al. 2021

†Colbertia lumbrerense Bond 1981

†Colbertia magellanica Price and Paula Couto 1950

G. †Dolichostylodon García López and Powell 2009

†Dolichostylodon saltensis García López and Powell 2009

G. †Itaboraitherium Paula Couto 1970

†Itaboraitherium atavum Couto 1954

Invalid names: Homalostylops atavus Paula Couto 1954 [objective synonym]

G. †Kibenikhoria Simpson 1935

†Kibenikhoria get Simpson 1935

G. †Maxschlosseria Ameghino 1901

†Maxschlosseria praeterita Ameghino 1901

Invalid names: Maxschlosseria consumata Ameghino 1901 [synonym], Maxschlosseria expansa Ameghino 1902 [synonym], Maxschlosseria minima Ameghino 1897 [objective synonym], Maxschlosseria minuta Ameghino 1901 [objective synonym], Maxschlosseria rusticula Ameghino 1901 [objective synonym], Maxschlosseria septa Ameghino 1901 [objective synonym]

Invalid names: Paracoelodus Ameghino 1904 [synonym]

G. †Oldfieldthomasia Ameghino 1901

†Oldfieldthomasia anfractuosa Ameghino 1901

†Oldfieldthomasia debilitata Ameghino 1901

Invalid names: Antepithecus innexus Ameghino 1904 [objective synonym], Oldfieldthomasia cingulata Ameghino 1901 [synonym], Oldfieldthomasia conifera Ameghino 1901 [synonym], Oldfieldthomasia cuneata Ameghino 1901 [synonym], Oldfieldthomasia furcata Ameghino 1901 [synonym], Oldfieldthomasia plicata Ameghino 1904 [synonym], Oldfieldthomasia transversa Ameghino 1901 [synonym]

†Oldfieldthomasia parvidens Ameghino 1901

Invalid names: Oldfieldthomasia pulchella Ameghino 1901 [synonym]

G. †Paginula Ameghino 1901

†Paginula parca Ameghino 1901

Invalid names: Acoelodus microdon Ameghino 1901 [synonym]

G. †Suniodon López 1995

†Suniodon catamarcensis López 1995

G. †Tsamnichoria Simpson 1936

†Tsamnichoria cabrerai Simpson 1936

G. †Ultrapithecus Ameghino 1901

†Ultrapithecus rutilans Ameghino 1901

G. †Xenostephanus Simpson et al. 1962

†Xenostephanus chiottii Simpson et al. 1962

Invalid names: Acoelodidae Ameghino 1901 [synonym]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialsubc

Locomotion:

actively mobilec

Life habit:

scansorialsubc

Diet:

herbivoreo

Reproduction:

viviparoussubc

Created:

2009-01-05 17:11:49

Modified:

2009-01-05 19:11:49

Source: o = order, subc = subclass, c = class, subp = subphylum

References: Lillegraven 1979, MacFadden et al. 1996, Hendy et al. 2009, Ji et al. 2002, Carroll 1988

Age range: base of the Riochican to the top of the Divisaderan or 57.00000 to 36.00000 Ma

Collections (42 total)

Time interval	Ma	Country or state	Original ID and collection number
Thanetian	59.24 - 56.0	Bolivia	Camargomendesia indet. (176065)
Riochican	57.0 - 56.0	Argentina (Chubut)	Kibenikhoria get, Notostylopidae indet. (14205) Notopithecus sp. (13781)
Early/Lower Eocene	56.0 - 48.07	Brazil (Rio de Janeiro)	Camargomendesia pristina, Homalostylops atavus, Henricosbornia magellanica (118314)
Ypresian	56.0 - 48.07	Argentina (Chubut)	Colbertia sp., Kibenikhoria sp., Itaboraitherium sp., Carmargomendesia sp. (133040)
Casamayoran	56.0 - 48.0	Argentina (Chubut)	Oldfieldthomasia sp. (175739 175743) Pleurostylodon minimus, Acoelodus microdon, Infrapithecus expansus (176285)
Casamayoran	56.0 - 48.0	Chile	Oldfieldthomasiidae indet. (38880)
Early/Lower Eocene - Middle Eocene	56.0 - 37.71	Argentina (Mendoza)	Kibenikhoria sp. (212320) Oldfieldthomasiidae indet., Kibenikhoria sp. (212321)
Lutetian	48.07 - 41.03	Argentina (Chubut)	Maxschlosseria consumata (176170) Maxschlosseria consumata, Maxschlosseria minuta (44956) Maxschlosseria minuta (176172) Maxschlosseria praeterita, Paginula parca, Maxschlosseria minima, Maxschlosseria rusticula, Maxschlosseria consumata (176165) O. gen. et sp. indet. I (176059)
Lutetian	48.07 - 41.03	Argentina (Salta)	Colbertia lumbrerense (13775) Colbertia sp., Colbertia lumbrerense, Colbertia falui (211419)
Lutetian - Bartonian	48.07 - 37.71	Argentina (Chubut)	Oldfieldthomasia debilitata, Isotemnus emundatus, Ultrapithecus rusticulus, Oldfieldthomasia marginalis, Oldfieldthomasia septa, Maxschlosseria praeterita, Paginula parca, Eochalicotherium minutum, Antepithecus plexostephanos, Maxschlosseria anatona (176164)
Middle Eocene	48.07 - 37.71	Argentina (Salta)	Dolichostylodon saltensis (132937)
Middle Eocene - Early/Lower Miocene	48.07 - 15.98	Argentina (Chubut)	Oldfieldthomasia sp. (176461)
Mustersan	48.0 - 42.0	Argentina (Chubut)	Tsamnichoria cabrerai (176289)
Divisaderan	42.0 - 36.0	Argentina (Mendoza)	Brachystephanus postremus, Xenostephanus chiottii (92669)
Bartonian	41.03 - 37.71	Brazil (Paraná)	Oldfieldthomasiidae indet. (186567)
Bartonian	41.03 - 37.71	Argentina (Chubut)	Oldfieldthomasia anfractuosa (176163) Oldfieldthomasia debilitata (49900 49902 175744 176182 176186 176191) Oldfieldthomasia debilitata, Ultrapithecus rutilans (176180 176181 176185) Oldfieldthomasia debilitata, Ultrapithecus rutilans, Oldfieldthomasia furcata, Oldfieldthomasia cuneata, Oldfieldthomasia cingulata, Oldfieldthomasia conifera, Oldfieldthomasia parvidens, Oldfieldthomasia pulchella, Oldfieldthomasia transversa, Paginula parca, Eostylops obliquatus, Antepithecus innexus, Oldfieldthomasia plicata (13779) Oldfieldthomasia indet., Paginula parca (176169) Paginula parca (176167) Ultrapithecus rutilans (176175 176178 176189)
Late/Upper Eocene	37.71 - 33.9	Argentina (La Pampa)	Oldfieldthomasiidae indet. (47318)
Priabonian	37.71 - 33.9	Argentina (Catamarca)	O. species indet. 2, Colbertia sp., Suniodon sp., Suniodon catamarcensis, Oldfieldthomasiidae indet. (41608)