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Thylacosmilus Atrox.jpg
Thylacosmilus skull
Scientific classification Red Pencil Icon.png
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Sparassodonta
Family: Thylacosmilidae
Riggs 1933

Thylacosmilinae Riggs 1933

Thylacosmilidae is an extinct family of metatherian predators, related to the modern marsupials, which lived in South America between the Miocene and Pliocene epochs. Like other South American mammalian predators that lived prior to the Great American Biotic Interchange, these animals belonged to the order Sparassodonta, which occupied the ecological niche of many eutherian mammals of the order Carnivora from other continents. The family's most notable feature are the elongated, laterally flattened fangs, which is a remarkable evolutionary convergence with other saber-toothed mammals like Barbourofelis and Smilodon . [1]


Taxonomic history

The family Thylacosmilidae was originally erected by Riggs in 1933, to accommodate Thylacosmilus , found in the Pliocene Brochero Formation of Argentina. Later, the family was demoted to a subfamily, as Thylacosmilinae, within Borhyaenidae, a group of superficially canid-like sparassodonts, under the assumption that Thylacosmilus was merely a late and specialized borhyaenid. Later, with the discovery of fragmentary specimens of new sparassodonts related to Thylacosmilus from Miocene and Pliocene strata, Thylacosmilidae was promoted back to familial status. [1]

In 1997, a second genus and species of thylacosmilid was described from the Laventan Honda Group at the Lagerstätte La Venta in Colombia, Anachlysictis gracilis . This animal, less specialized than Thylacosmilus, was the first indication that the family origins dates back to before the end of the Miocene. In fact, the anatomy of Anachlysictis' molar teeth suggests a closer relationship with basal sparassodonts like Hondadelphys than with advanced sparassodonts like Borhyaena . [2] [3] Also, additional materials of a small predatory sparassodont of Colombia have been found, which has certain features diagnostic of thylacosmilids, but much less specialized, as well as indeterminate remains in Uruguay and the Argentinean Patagonia, from the early Pliocene, has been tentatively assigned to family. [1] Forasiepi and Carlini in 2010 unveiled a third genus and species, Patagosmilus goini , from the Collón Cura Formation of Argentina from the mid-Miocene, with characteristics intermediate between Anachlysictis and Thylacosmilus. [1]


The family is perhaps the best known among sparassodonts because their dental and cranial specializations, which is superficially similar to that of the saber-toothed cats, often cited as an example of convergent evolution between placental and metatherian mammals. However, there were several differences between thylacosmilids and the other saber-toothed mammals, and these unique traits diagnose the family: unique traits include canine teeth that grew continuously, less specialized carnassial molars and tremendous, flange-like outgrowths of the lower jaw that protected the saber-teeth.

In Thylacosmilus, the last and most specialized known member, the incisors are very small and the lower teeth are poorly developed, and tack-shaped; in the other genera these elements are unknown. In Thylacosmilus, the upper incisors are unknown other than by wear indentations on the lower incisors, as no premaxilla has ever been found complete in this genus. [4] Another evolutionary trend in families is the progressive reduction of masseter and temporal muscles, resulting in relatively weak bites, but compensated by the increase in the size of the neck muscles to lower the head and the fangs into the necks of their prey. [5] Fossils of Thylacosmilus forelimbs, the only reported for this group, indicate that animals were not fast runners, and were in turn adapted to exert force in order to subdue their prey, helping with their semiopposable thumb. [6]

A recent study has since proposed a lack of analogy between thylacosmilids and saber toothed eutherians, speculating that rather than using the fangs to pierce prey they were instead used to open up corpses. Their lack of incisors and crushing molars suggest an entrail-based diet, and irrigated bone on the maxillae suggests some sort of extensive, soft tissue-based structure. [7]

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Thylacosmilus is an extinct genus of saber-toothed metatherian mammals that inhabited South America from the Late Miocene to Pliocene epochs. Though Thylacosmilus looks similar to the "saber-toothed cats", it was not a felid, like the well-known North American Smilodon, but a sparassodont, a group closely related to marsupials, and only superficially resembled other saber-toothed mammals due to convergent evolution. A 2005 study found that the bite forces of Thylacosmilus and Smilodon were low, which indicates the killing-techniques of saber-toothed animals differed from those of extant species. Remains of Thylacosmilus have been found primarily in Catamarca, Entre Ríos, and La Pampa Provinces in northern Argentina.


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Dukecynus is an extinct genus of meat-eating metatherian belonging to the order Sparassodonta, which lived in South America during the Middle Miocene (Laventan), between about 13.8 and 11.8 million years ago. The name of the genus meaning "Duke dog", for Duke University and the Greek word cynos, dog, for the pretended similarity of this animal with dogs. A single species known so far, Dukecynus magnus. The species name "magnus" derives from Latin for big, to reflect their great size.


Proborhyaenidae is an extinct family of metatherian mammals of the order Sparassodonta, which lived in South America from the Eocene (Mustersan) until the Oligocene (Deseadan). Sometimes it has been included as a subfamily of their relatives, the borhyaenids. Body mass estimates suggest that proborhyaenids could weigh up to 150 kilograms (330 lb), making them some of the largest known metatherians. Proborhyaenid remains have been found in western Bolivia, Uruguay, southern Brazil, and the provinces of Mendoza, Salta, and Chubut, in Argentina.

Pharsophorus is an extinct genus of borhyaenoid sparassodont that inhabited South America during the Middle to Late Oligocene epoch.

Patagosmilus is an extinct genus of meat-eating metatherian mammal of the family Thylacosmilidae, that lived in the Middle Miocene in South America. Like other representatives of this family, such as Thylacosmilus atrox and Anachlysictis gracilis, it was characterized by its elongated fangs of the upper jaw, similar to the well known "sabertooth cats" (Machairodontinae), which they were ecological equivalents. Despite being geologically younger than Anachlysictis, the morphology of Patagosmilus suggests that this species was more closely related to Thylacosmilus than Anachlysictis, though in other respects this species is less specialized than Thylacosmilus.

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Patagonia is an extinct genus of non-placental mammal from the Miocene of Argentina. Traditionally considered a metatherian incertae sedis, more recent analysis have shown it to be a gondwanathere. It is the youngest allothere species known.

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Macroeuphractus is a genus of extinct armadillos from the Late Miocene to Late Pliocene of South America. The genus is noted for its large size, with Macroeuphractus outesi being the largest non-pampathere or glyptodont armadillo discovered, as well as its specializations for carnivory, unique among all xenarthrans.


Thylophorops is an extinct genus of didelphine opossums from the Pliocene of South America. Compared to their close didelphine cousins like the living Philander and Didelphis opossums, Thylophorops displays specialization towards carnivory, and one species, T. lorenzinii, is the largest known opossum of all time, which could imply a macropredatory role.

Anatoliadelphys maasae is an extinct genus of predatory metatherian mammal from the Eocene of Europe. It was an arboreal, cat-sized animal, with powerful crushing jaws similar to those of the modern Tasmanian devil. Although most mammalian predators of the northern hemisphere in this time period were placentals, Europe was an archipelago, and the island landmass now forming Turkey might have been devoid of competing mammalian predators, though this may not matter since other carnivorous metatherians are also known from the Cenozoic in the Northern Hemisphere. Nonetheless, it stands as a reminder that mammalian faunas in the Paleogene of the Northern Hemisphere were more complex than previously thought, and metatherians did not lose their hold as major predators after their success in the Cretaceous.


  1. 1 2 3 4 Analía M. Forasiepi & Alfredo A. Carlini (2010). A new thylacosmilid (Mammalia, Metatheria, Sparassodonta) from the Miocene of Patagonia, Argentina. Zootaxa 2552: 55–68
  2. Goin, F.J. (1997) New clues for understanding Neogene marsupial radiations. In: Kay, R.F., Madden, R.H., Cifelli, R.L. & Flynn, J. (Eds.), A History of the Neotropical Fauna -Vertebrate Paleobiology of the Miocene in Colombia. Smithsonian Institution Press, Washington, pp. 185–204.
  3. Goin, F.J. 2003. Early marsupial radiations in South America. En: M. Jones, C. Dickman y M. Archer (eds.), Predators with Pouches, The Biology of Carnivorous Marsupials, CSIRO Publishing, Australia, pp. 30-42.
  4. Anton, Mauricio (2013). Sabertooth.
  5. Christine Argot (2004): Evolution of South American mammalian predators (Borhyaenoidea): anatomical and palaeobiological implications. Zoological Journal of the Linnean Society, 2004, 140, 487–521.
  6. Christine Argot (2004): Functional-adaptive features and palaeobiologic implications of the postcranial skeleton of the late Miocene sabretooth borhyaenoid Thylacosmilus atrox (Metatheria), Alcheringa: An Australasian Journal of Palaeontology, 28:1, 229-266.