PBDB Taxon

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

Trigonostylops

Mammalia - Astrapotheria - Trigonostylopidae

Taxonomy

Trigonostylops was named by Ameghino (1897). Its type is Trigonostylops wortmani. It is the type genus of Trigonostylopidae.

It was assigned to Notostylopidae by Ameghino (1897); and to Trigonostylopidae by Ameghino (1901), Paula Couto (1952), Simpson (1957), Simpson (1967) and Carroll (1988).

Species

T. gegenbauri, T. wortmani (syn. T. columnifer, T. insumptus, T. minimus, T. eximius, T. scabellum, T. trigonus, T. coryphodontoides, T. hemicyclus, T. secundarius, T. subtrigonus, T. germinalis, T. integer) (type species)

Synonyms

Staurodon was named by Roth (1899).

It was synonymized subjectively with Trigonostylops by Ameghino (1904) and Simpson (1967).

It was assigned to Mammalia by Roth (1899).
Staurodon gegenbauri was named by Roth (1899). Its type specimen is lower mandible with 1 C and 1 M, a mandible, 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).
Chiodon was named by Berg (1899).

It was synonymized subjectively with Trigonostylops by Ameghino (1904) and Simpson (1967).

Synonymy list

Year	Name and author
1897	Trigonostylops Ameghino p. 492
1899	Chiodon Berg
1899	Staurodon Roth p. 386
1899	Staurodon gegenbauri Roth p. 386
1901	Trigonostylops Ameghino p. 395
1952	Trigonostylops Paula Couto
1957	Trigonostylops Simpson
1967	Trigonostylops Simpson
1988	Trigonostylops Carroll

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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

Rank	Name	Author
—	Therapsida	()
infraorder	Cynodontia	()
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Afrotheria	Stanhope et al. 1998
—	Paenungulatomorpha
—	Paenungulata	Simpson 1945
—	Sudamericungulata
order	Astrapotheria
family	Trigonostylopidae
genus	Trigonostylops

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. †Trigonostylops Ameghino 1897

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†Trigonostylops wortmani Ameghino 1897

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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]

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: Carroll 1988, Lillegraven 1979, Ji et al. 2002, 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 (29 total)

Time interval	Ma	Country or state	Original ID and collection number
Riochican	57.0 - 55.8	Argentina (Chubut)	Seudenius cteronc (14205) T. sp., Postpithecus sp. (13781)
Casamayoran	56.0 - 48.0	Argentina (Chubut)	T. sp. (49899 176304) T. subtrigonus (176283) T. wortmani (176491)
Casamayoran	56.0 - 48.0	Argentina (Santa Cruz)	T. sp. (50066)
Ypresian	56.0 - 47.8	Argentina (Chubut)	T. sp. (133040)
Early/Lower Eocene	55.8 - 48.6	Brazil (Rio de Janeiro)	T. sp. (38793)
Mustersan	48.0 - 42.0	Argentina (Chubut)	Staurodon gegenbauri (176290)
Lutetian	47.8 - 41.3	Argentina (Chubut)	T. wortmani (44956 176170 176173 176174)
Lutetian - Bartonian	47.8 - 38.0	Argentina (Chubut)	T. wortmani, T. scabellum (176164)
Middle Eocene	47.8 - 37.71	Argentina (Chubut)	T. wortmani (225618)
Divisaderan	42.0 - 36.0	Argentina (Mendoza)	Trigonostylopidae indet. (92669)
Bartonian	41.3 - 38.0	Argentina (Chubut)	T. sp. (49900) T. wortmani (176169 176177 176181 176182 176190) T. wortmani, T. integer (176163) T. wortmani, T. secundarius, T. minimus, T. trigonus, T. insumptus, T. eximius, T. scabellum, T. hemicyclus, T. columnifer, T. coryphodontoides, T. germinalis (13779)
Bartonian	41.3 - 38.0	Argentina (Santa Cruz)	T. wortmani (176494)
Bartonian - Priabonian	41.3 - 33.9	Antarctica	T. sp. (173115)
Bartonian - Priabonian	41.3 - 33.9	Argentina (Río Negro)	T. sp. (225621)
Priabonian - Rupelian	38.0 - 28.1	Peru (Loreto)	T. sp. (144474)