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Trimerostephanos coarctatus

Mammalia - Notoungulata - Isotemnidae

Taxonomy
Trimerostephanos coarctatus was named by Ameghino (1901) [Simpson (1967: 144) considered MACN 10965A and MACN 10966A as syntypes]. Its type specimen is MACN 10965, MACN 10966; two lots of various specimens and is a 3D body fossil. Its type locality is Mustersan of Patagonia, which is in a Mustersan terrestrial horizon in Argentina.

It was recombined as Trimerostephanus coarctatus by Ameghino (1901); it was recombined as Acoelohyrax coarctatus by Simpson (1967); it was recombined as Puelia coarctatus by Bond and López (1993).

Synonymy list
YearName and author
1901Trimerostephanus coarctatus Ameghino
1901Trimerostephanos coarctatus Ameghino p. 419
1967Acoelohyrax coarctatus Simpson
1993Puelia coarctatus Bond and López p. 66

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
subclassSynapsida
Therapsida()
infraorderCynodontia()
Mammaliamorpha
RankNameAuthor
Mammaliaformes
classMammalia
Theriamorpha(Rowe 1993)
Theriiformes()
Trechnotheria
Cladotheria
Zatheria
subclassTribosphenida()
subclassTheria
Eutheria()
Placentalia
AfrotheriaStanhope et al. 1998
Paenungulatomorpha
PaenungulataSimpson 1945
Sudamericungulata
orderNotoungulata
suborderToxodontiaAmeghino 1887
familyIsotemnidae
genusTrimerostephanosAmeghino 1895
speciescoarctatus

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.

Trimerostephanos coarctatus Ameghino 1901
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Diagnosis
ReferenceDiagnosis
M. Bond and G. M. López 1993As for comparing the Mustersian species tentatively placed by Simpson, 1967 within the genus Acoelohyrax, they were considered by Odreman Rivas (1978: 35) as representatives of the family Notohippidae, although different and more generalized than Eomorphippus. Indeed, the comparison between these species and Puelia plicata with the unpublished material mentioned above (Pampahippus gen. nov.) allows us to recognize Puelia plicata Roth, 1902 as a primitive Notohippidae and including in this genus, as a new combination, the species P. coarctatus Ameghino, 1901 and P. sigma Ameghino, 1901. Trimerostephanos coalitus Ameghino, 1901 is considered a probable large Notohippidae, very different and more advanced than the species recognized for the genus Puelia.