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Thylacosmilus

Thylacosmilus ("pouch sabre") was a genus of sabre-toothed metatherian predators that first appeared during the Miocene. Remains of the animal have been found in parts of South America, primarily Argentina. It was not a relative of the true saber-tooth cat, which it resembles only because of convergent evolution.

Sparassodonta

Sparassodonta is an extinct order of carnivorous metatherians mammals native to South America They were once considered to be true marsupials, but are now thought to be a sister taxon to them A number of these mammalian predators closely resemble placental predators that evolved separately on other continents, and are cited frequently as examples of convergent evolution They were first described by Florentino Ameghino, from fossils found in the Santa Cruz beds of Patagonia

Borhyaenidae

The borhyaenids, members of the Borhyaenidae family of metatherians (probably not true marsupials, but sister taxa to them; see Sparassodonta), were a carnivorous group of otter/wolverine-shaped marsupials in the order Sparassodonta. They lived in the Miocene of South America. Like most metatherians, they had a pouch to carry their offspring around. Borhyaenids had strong and powerful jaws, like those of Hyaenodon and Andrewsarchus, for crushing bones. They grew up to 5 or 6 feet long.

Sinodelphys

Sinodelphys or "Chinese opossum" is an extinct mammal from the Early Cretaceous. To date it is the oldest marsupial fossil known, estimated to be 125 million years old. It was discovered and described in 2003 in rocks of the Yixian Formation in Liaoning Province, China, by a team of scientists including Zhe-Xi Luo and John Wible.

Deltatheridium

Deltatheridium was a species of Metatherian. It lived in what is now Mongolia during the Upper Cretaceous. It was a basal metatherian, which places it near start of the linage that lead to the marsupials, such the kangaroo, koala, and opossum. It had a length of 15 cm (5.9 in). Apart from preying on insects, its diet was also composed of small reptiles and what it could scavenge from left-over carcasses, using its sharp canine teeth.

Necrolestes

Necrolestes patagonensis ("Grave Robber" or "Thief of the Dead" + Patagonia) is an extinct mammal, suspected to be a marsupial, that lived in the early Miocene of South America. About one-third of the animal's skeleton - including most of the skull - has been found as disassociated bones of several individuals. The jaw bends up at the tip, possibly supporting a fleshy appendage similar to the sensitive tentacles of the star-nosed mole.

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