PBDB Taxon

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Trigonostylopidae

Mammalia - Astrapotheria - Trigonostylopidae

Taxonomy

Trigonostylopidae was named by Ameghino (1901). Its type is Trigonostylops.

It was assigned to Taligrada by Ameghino (1901); to Trigonostylopoidea by Simpson (1934) and Simpson (1967); and to Astrapotheria by Simpson (1957), Carroll (1988), McKenna and Bell (1997) and López (2010).

Subtaxa

Albertogaudrya (syn. Scabellia), Albertogaudryia, Hedralophus, Hedralophus bicostatus, Seudenius, Seudenius cteronc, Shecenia, Shecenia ctirneru, Staurodon supernus, Tetragonostylops, Trigonostylops (syn. Chiodon, Staurodon) (type genus), Trigonostylops duplex

Synonyms

Staurodon supernus was named by Roth (1899). Its type specimen is canine, molar, a set of teeth, and it is a 3D body fossil. Its type locality is Lago Musters, which is in a Mustersan terrestrial horizon in Argentina.

It was considered a nomen dubium by Simpson (1967).
Trigonostylops duplex was named by Ameghino (1901). It is a 3D body fossil. Its type locality is Barranca south of Lago Colhue-Huapi, Gran Barranca, which is in a Bartonian terrestrial claystone in the Sarmiento Formation of Argentina.

It was recombined as Scabellia duplex by Ameghino (1904); it was considered a nomen dubium by Simpson (1967).
Hedralophus was named by Ameghino (1901).

It was considered a nomen dubium by Simpson (1967).

It was assigned to Leontiniidae by Ameghino (1901).
Hedralophus bicostatus was named by Ameghino (1901). It is a 3D body fossil. Its type locality is Casamayoran of Patagonia, which is in a Casamayoran terrestrial horizon in Argentina.

It was considered a nomen dubium by Simpson (1967).
Seudenius was named by Simpson (1935).

It was considered a nomen dubium by Vera and Krause (2020).

It was assigned to Notioprogonia by Simpson (1935); and to Notostylopidae by Carroll (1988).
Shecenia was named by Simpson (1935). Its type is Shecenia ctirneru.

It was considered a nomen dubium by Vera and Krause (2020).

It was assigned to Trigonostylopoidea by Simpson (1935); and to Trigonostylopidae by Simpson (1967), Carroll (1988) and McKenna and Bell (1997).
Seudenius cteronc was named by Simpson (1935). Its type specimen is Amer. Mus. No. 28538, a maxilla (part of left maxilla with P3-M2), and it is not a trace fossil. Its type locality is Cañadón Hondo, Kibenikhoria Faunal Zone, which is in a Riochican alluvial fan sandstone in the Las Flores Formation of Argentina.

It was considered a nomen dubium by Vera and Krause (2020).
Shecenia ctirneru was named by Simpson (1935). Its type specimen is AMNH 28531, a mandible (mandibular symphysis with various alveoli and roots or worn bases of one pair of teeth), and it is a 3D body fossil. Its type locality is Cañadón Hondo, Kibenikhoria Faunal Zone, which is in a Riochican alluvial fan sandstone in the Las Flores Formation of Argentina. It is the type species of Shecenia.

It was considered a nomen dubium by Vera and Krause (2020).

Synonymy list

Year	Name and author
1899	Staurodon supernus Roth p. 386
1901	Trigonostylopidae Ameghino p. 394
1901	Trigonostylops duplex Ameghino p. 398
1901	Hedralophus Ameghino p. 410
1901	Hedralophus bicostatus Ameghino p. 410
1904	Scabellia duplex Ameghino p. 80
1934	Trigonostylopidae Simpson
1935	Seudenius Simpson p. 14
1935	Seudenius cteronc Simpson p. 15
1935	Shecenia Simpson p. 19
1935	Shecenia ctirneru Simpson p. 20
1957	Trigonostylopidae Simpson
1967	Shecenia Simpson
1967	Shecenia ctirneru Simpson
1967	Trigonostylopidae Simpson
1988	Seudenius Carroll
1988	Shecenia Carroll
1988	Trigonostylopidae Carroll
1997	Shecenia McKenna and Bell
1997	Trigonostylopidae McKenna and Bell
2010	Trigonostylopidae López

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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	()

Rank	Name	Author
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia
—	Theriamorpha	(Rowe 1993)
—	Theriiformes	()
—	Trechnotheria
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Afrotheria	Stanhope et al. 1998
—	Paenungulatomorpha
—	Paenungulata	Simpson 1945
—	Sudamericungulata
order	Astrapotheria
family	Trigonostylopidae
family	Trigonostylopidae

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. †Trigonostylopidae Ameghino 1901

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G. †Albertogaudrya Ameghino 1901

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†Albertogaudrya carahuasensis Carbajal et al. 1977

†Albertogaudrya robusta Roth 1904

†Albertogaudrya unica Ameghino 1901

Invalid names: Albertogaudrya oxygona Ameghino 1904 [synonym], Albertogaudrya regia Ameghino 1902 [synonym], Albertogaudrya separata Ameghino 1904 [synonym], Albertogaudrya tersa Ameghino 1902 [synonym], Scabellia cyclogona Ameghino 1904 [synonym], Scabellia laticincta Ameghino 1901 [synonym]

Invalid names: Scabellia Ameghino 1901 [synonym]

G. †Albertogaudryia

G. †Tetragonostylops Paula Couto 1963

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†Tetragonostylops apthomasi Price and Paula Couto 1950

G. †Trigonostylops Ameghino 1897

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†Trigonostylops wortmani Ameghino 1897

Invalid names: Trigonostylops columnifer Ameghino 1904 [synonym], Trigonostylops coryphodontoides Ameghino 1904 [synonym], Trigonostylops eximius Ameghino 1901 [synonym], Trigonostylops germinalis Ameghino 1904 [synonym], Trigonostylops hemicyclus Ameghino 1901 [synonym], Trigonostylops insumptus Ameghino 1901 [synonym], Trigonostylops integer Ameghino 1901 [synonym], Trigonostylops minimus Ameghino 1901 [synonym], Trigonostylops scabellum Ameghino 1901 [synonym], Trigonostylops secundarius Ameghino 1901 [synonym], Trigonostylops subtrigonus Ameghino 1901 [synonym], Trigonostylops trigonus Ameghino 1901 [synonym]

Invalid names: Chiodon Berg 1899 [synonym], Staurodon Roth 1899 [synonym], Trigonostylops gegenbauri Roth 1899 [nomen dubium]

Invalid names: Hedralophus Ameghino 1901 [nomen dubium], Hedralophus bicostatus Ameghino 1901 [nomen dubium], Seudenius Simpson 1935 [nomen dubium], Seudenius cteronc Simpson 1935 [nomen dubium], Shecenia Simpson 1935 [nomen dubium], Shecenia ctirneru Simpson 1935 [nomen dubium], Staurodon supernus Roth 1899 [nomen dubium], Trigonostylops duplex Ameghino 1901 [nomen dubium]

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 17:11:22

Modified:

2009-01-05 19:11:22

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

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

Age range: base of the Casamayoran to the top of the Middle Eocene or 56.00000 to 37.71000 Ma

Collections (37 total)

Time interval	Ma	Country or state	Original ID and collection number
Riochican	57.0 - 55.8	Argentina (Chubut)	Shecenia ctirneru, Seudenius cteronc (14205) Trigonostylops sp., Postpithecus sp. (13781)
Casamayoran	56.0 - 48.0	Argentina (Chubut)	Albertogaudrya unica, Hedralophus bicostatus (176285) Trigonostylops sp. (49899 176304) Trigonostylops subtrigonus (176283) Trigonostylops wortmani (176491)
Casamayoran	56.0 - 48.0	Argentina (Santa Cruz)	Trigonostylops sp. (50066)
Ypresian	56.0 - 47.8	Argentina (Chubut)	Shecenia sp., Trigonostylops sp. (133040)
Ypresian	56.0 - 47.8	Antarctica	Trigonostylopidae indet. (32360)
Ypresian	56.0 - 47.8	Argentina (Salta)	Albertogaudrya carahuasensis (44957)
Early/Lower Eocene	55.8 - 48.6	Brazil (Rio de Janeiro)	Trigonostylops apthomasi, Trigonostylops sp. (118314) Trigonostylops sp. (38793)
Mustersan	48.0 - 42.0	Argentina (Chubut)	Albertogaudrya robusta (175761) Staurodon gegenbauri, Staurodon supernus (176290)
Lutetian	47.8 - 41.3	Argentina (Chubut)	Albertogaudrya indet., Trigonostylops wortmani (44956 176174) Tetragonostylops apthomasi, Trigonostylops wortmani (176170) Trigonostylops wortmani (176173)
Lutetian - Bartonian	47.8 - 38.0	Argentina (Chubut)	Trigonostylops wortmani, Trigonostylops scabellum (176164)
Middle Eocene	47.8 - 37.71	Argentina (Chubut)	Trigonostylops wortmani (225618)
Divisaderan	42.0 - 36.0	Argentina (Mendoza)	Trigonostylopidae indet. (92669)
Bartonian	41.3 - 38.0	Argentina (Santa Cruz)	Trigonostylops wortmani (176494)
Bartonian	41.3 - 38.0	Argentina (Chubut)	Albertogaudrya indet., Trigonostylops wortmani (176181) Albertogaudrya sp., Albertogaudrya unica, Trigonostylops wortmani, Trigonostylops integer, Albertogaudrya regia (176163) Albertogaudrya unica (49902 175744 176167) Albertogaudrya unica, Trigonostylops wortmani (176190) Albertogaudrya unica, Trigonostylops wortmani, Trigonostylops secundarius, Trigonostylops minimus, Trigonostylops trigonus, Trigonostylops insumptus, Trigonostylops eximius, Trigonostylops scabellum, Trigonostylops hemicyclus, Trigonostylops duplex, Scabellia laticincta, Albertogaudrya tersa, Trigonostylops columnifer, Trigonostylops coryphodontoides, Trigonostylops germinalis, Scabellia cyclogona, Albertogaudrya oxygona, Albertogaudrya separata (13779) Trigonostylops sp., Albertogaudrya sp. (49900) Trigonostylops wortmani (176169 176177 176182)
Bartonian - Priabonian	41.3 - 33.9	Antarctica	Trigonostylops sp. (173115)
Bartonian - Priabonian	41.3 - 33.9	Argentina (Río Negro)	Trigonostylops sp. (225621)
Priabonian - Rupelian	38.0 - 28.1	Peru (Loreto)	Trigonostylops sp. (144474)