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Echidna
- Family: Tachyglossidae
- Order: Monotremata
- Subclass: Prototheria
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Distinctive beak-like skull
- Order: Monotremata
- Subclass: Prototheria
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platypus
- Family: Ornithorhynchidae
- Order: Monotremata
- Subclass: Prototheria
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American Opossums
- Didelphidae
- Order: Didelphimorphia
- Cohort: Ameridelphia
- Infraclass: Metatheria
- Subclass: Theria
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Tasmanian Devil
- Family: Dasyuridae
- Order: Dasyuromorphia
- Cohort: Australidelphia
- Infraclass: Metatheria
- Subclass: Theria
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Bandicoot
- Peramelidae
- Order: Peramelemorphia
- Cohort: Australidelphia
- Infraclass: Metatheria
- Subclass: Theria
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Long rostrum, holes in skull
Bandicoot
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Australidelphia
Cohort containing all marsupial groups not in Ameridelphia
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Ameridelphia
Cohort containing Didelphimorphia/Didelphidae the American opossum
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Koala
- Phascolarctidae
- Order: Diprotodontia
- Cohort: Australidelphia
- Infraclass: Metatheria
- Subclass: Theria
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Cuscus
- Phalangeridae
- Order: Diprotodontia
- Cohort: Australidelphia
- Infraclass: Metatheria
- Subclass: Theria
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Ringtail possums
- Psuedocheiridae
- Order: Diprotodontia
- Cohort: Australidelphia
- Infraclass: Metatheria
- Subclass: Theria
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Projecting lower incision, smaller skull
- Psuedocheiridae
- "ringtail possum"
- Order: Diprotodontia
- Cohort: Australidelphia
- Infraclass: Metatheria
- Subclass: Theria
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Kangaroos, wallabies
- Macropodidae
- Order:Diprotodontia
- Cohort: Australidelphia
- Infraclass: Metatheria
- Subclass: Theria
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Double wedge teeth, paraoccipital process
- Macropodidae
- "kangaroos & wallabies"
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Armadillos
- Dasypodidae
- Order: Cingulata
- Infraclass: Eutheria
- Subclass: Theria
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No sutures, shaped like armadillo
- Dasypodidae
- Order: Cingulata
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Three-toed sloths
- Bradypodidae
- Order: Pilosa
- Infraclass: Eutheria
- Subclass: Theria
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anteaters
- Myrmecophagidae
- Order: Pilosa
- Infraclass: Eutheria
- Subclass: Theria
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Long, smooth, distinct skull
- Myrmecophagidae
- "anteater"
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Pangolins
- Manidae
- Order: Pholidota
- Infraclass: Eutheria
- Subclass: Theria
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No teeth in skull, pangolins shape
- Manidae
- Pholidota
- Eutheria
- Theria
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Smaller, koala-shaped skull
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Sloths, anteaters
- Order: Pilosa
- Infraclass: Eutheria
- Subclass: Theria
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Koala, kangaroo, ringtail possum, cuscus
- Order: Diprotodontia
- Cohort: Australidelphia
- Infraclass: Metatheria
- Subclass: Theria
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Tasmanian devil, bandicoot, koala, cuscus, ringtail possums, kangaroos
- Cohort: Australidelphia
- Infraclass: Metatheria
- Subclass: Theria
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