Metatheria

metatherianmetatheriansmetatheremarsupialiformsMetatheria indet.
Metatheria is a mammalian clade that includes all mammals more closely related to marsupials than to placentals.wikipedia
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Eutheria

eutherianplacental mammalseutherians
Except for the North American Virginia opossum, which is a metatherian, all post-Miocene mammals indigenous to Europe, Africa, Asia, and North America north of Mexico are eutherians.

Dasyuromorphia

dasyuromorphsdasyuromorphcarnivorous marsupial
Some members of partially extinct clade Metatheria and all members of extinct superorder Sparassodonta were carnivorous too.

Monotreme

monotremesMonotremataegg-laying mammals
The relationships between the three extant divisions of mammals (monotremes, marsupials, and placental mammals) was long a matter of debate among taxonomists.
Monotremes (from Greek μονός, monos ('single') and τρῆμα, trema ('hole'), referring to the cloaca) are one of the three main groups of living mammals, along with placentals (Eutheria) and marsupials (Metatheria).

Sinodelphys

Sinodelphys szalayioldest metatherian fossils
Using this criterion, the earliest known metatherian is Sinodelphys szalayi, which lived in China around 125 million years ago (mya).
To date, it is the oldest metatherian fossil known, estimated to be 125 million years old.

Mammal

mammalsMammaliamammalian
Metatheria is a mammalian clade that includes all mammals more closely related to marsupials than to placentals.
The earliest known metatherian is Sinodelphys, found in 125 million-year-old Early Cretaceous shale in China's northeastern Liaoning Province.

Herpetotheriidae

herpetotheriidherpetotheriids?Herpetotheriidae indet.
In Laurasian landmasses, herpetotheriids and peradectids remained alive until the mid to late Miocene, with the peradectids Siamoperadectes and Sinoperadectes being the youngest Laurasian metatherians.
Herpetotheriidae is an extinct family of metatherians.

Siamoperadectes

Siamoperadectes minutus
In Laurasian landmasses, herpetotheriids and peradectids remained alive until the mid to late Miocene, with the peradectids Siamoperadectes and Sinoperadectes being the youngest Laurasian metatherians.
Siamoperadectes is a genus of non-marsupial metatherian from the Miocene of Thailand.

List of monotremes and marsupials

the global list
The latter subclass is divided into two infraclasses: pouched mammals (metatherians or marsupials), and placental mammals (eutherians, for which see List of placental mammals).

Sparassodonta

sparassodontsparassodontsProthylacinidae
Sparassodonta (from Greek σπαράσσειν [sparassein], to tear, rend; and ὀδούς, gen. ὀδόντος [odous, odontos], tooth) is an extinct order of carnivorous metatherian mammals native to South America.

Deltatheroida

deltatheroideandeltatheroideansdeltatheroid
Deltatheroida is an extinct group of basal metatherians that were distantly related to modern marsupials.

Lycopsis

Lycopsis longirostrusLycopsis padillaiLycopsis longirostris
Lycopsis is an extinct genus of South American metatherian, that lived during the Miocene in Argentina and Colombia.

Cretaceous

Cretaceous PeriodMiddle CretaceousEarly Cretaceous
However, these are not seen after the end of the Early Cretaceous and by the Late Cretaceous marsupials and placentals had evolved from a common eupantotherian ancestor.
Neither true marsupials nor placentals existed until the very end, but a variety of non-marsupial metatherians and non-placental eutherians had already begun to diversify greatly, ranging as carnivores (Deltatheroida), aquatic foragers (Stagodontidae) and herbivores (Schowalteria, Zhelestidae).

Polydolopimorphia

PolydolopimorphaPolydolopimorphia indet.Polydolopimorphia sp.
Polydolopimorphia is an extinct order of Metatherians, more closely related to extant Marsupials than other extinct mammals.

Stagodontidae

stagodontidstagodontstagodontids
Stagodontidae is an extinct family of carnivorous metatherian mammals that inhabited North America during the late Cretaceous, and possibly to the Eocene in South America.

Asiatheriidae

Asiadelphia
Asiatheriidae ("Asian opossums") is an family of Cretaceous metatherians in the order Asiadelphia.

Eutriconodonta

eutriconodonttriconodonttriconodonts
This class gave rise to Multituberculata (herbivorous mammals), Triconodonta and Symmetrodonta (carnivorous and insectivorous mammals).
At least in carnivorous niches, eutriconodonts were probably replaced by deltatheroidean metatherians, which are the dominant carnivorous mammals in Late Cretaceous faunal assemblages.

Marsupial

marsupialsMarsupialiajoey
Metatheria is a mammalian clade that includes all mammals more closely related to marsupials than to placentals. First proposed by Thomas Henry Huxley in 1880, it is a slightly more inclusive group than the marsupials; it contains all marsupials as well as many extinct non-marsupial relatives.
Marsupials represent the clade originating from the last common ancestor of extant metatherians.

Alphadontidae

alphadontidsalphadontid
Alphadontidae was a family of small, primitive mammal that was a member of the metatherians, a group of mammals that includes modern-day marsupials.

Cretaceous–Paleogene extinction event

extinction of the dinosaursCretaceous-Paleogene extinction eventK-Pg extinction event
Indeed, it appears metatherians suffered the heaviest mammalian casualties in the KT event, taking longer to recover than other groups.
All major Cretaceous mammalian lineages, including monotremes (egg-laying mammals), multituberculates, metatherians, eutherians, dryolestoideans, and gondwanatheres survived the K–Pg extinction event, although they suffered losses.

Clade

cladesgroupcladistic
Metatheria is a mammalian clade that includes all mammals more closely related to marsupials than to placentals.

Thomas Henry Huxley

Thomas HuxleyHuxleyT. H. Huxley
First proposed by Thomas Henry Huxley in 1880, it is a slightly more inclusive group than the marsupials; it contains all marsupials as well as many extinct non-marsupial relatives.

Tribosphenida

Boreosphenida
Metatherians belong to a subgroup of the northern tribosphenic mammal clade or Boreosphenida.

Calcaneus

calcaneumheel bonesustentaculum tali
Other morphologies include skeletal and anterior dentition, such as wrist and ankle apomorphies; all metatherians share derived pedal characters and calcaneal features.

Platypus

Ornithorhynchus anatinusduck-billed platypusOrnithorhynchus

Echidna

echidnasTachyglossidaespiny anteater