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  2. Monotreme - Wikipedia

    en.wikipedia.org/wiki/Monotreme

    Monotremes (/ ˈ m ɒ n ə t r iː m z /) are mammals of the order Monotremata. They are the only group of living mammals that lay eggs, rather than bearing live young. The extant monotreme species are the platypus and the four species of echidnas. Monotremes are typified by structural differences in their brains, jaws, digestive tract ...

  3. List of monotremes and marsupials - Wikipedia

    en.wikipedia.org/wiki/List_of_monotremes_and...

    Family Macropodidae. Subfamily Sthenurinae. Genus Lagostrophus. Banded hare-wallaby (Lagostrophus fasciatus) Subfamily Macropodinae. Genus Dendrolagus: tree-kangaroos. Grizzled tree-kangaroo (Dendrolagus inustus) Lumholtz's tree-kangaroo (Dendrolagus lumholtzi) Bennett's tree-kangaroo (Dendrolagus bennettianus) Ursine tree-kangaroo (Dendrolagus ...

  4. Ornithorhynchoidea - Wikipedia

    en.wikipedia.org/wiki/Ornithorhynchoidea

    Ornithorhynchoidea is a superfamily of mammals containing the only living monotremes, the platypus and the echidnas, as well as their closest fossil relatives, to the exclusion of more primitive fossil monotremes of uncertain affinity.

  5. Echidna - Wikipedia

    en.wikipedia.org/wiki/Echidna

    Echidnas (/ ɪ ˈ k ɪ d n ə z /), sometimes known as spiny anteaters, [1] are quill-covered [2] monotremes (egg-laying mammals) belonging to the family Tachyglossidae / t æ k i ˈ ɡ l ɒ s ɪ d iː /, living in Australia and New Guinea.

  6. Platypus - Wikipedia

    en.wikipedia.org/wiki/Platypus

    [98] [99] In fact, modern monotremes are the survivors of an early branching of the mammal tree, and a later branching is thought to have led to the marsupial and placental groups. [98] [100] Molecular clock and fossil dating suggest platypuses split from echidnas around 19–48 million years ago. [101] Reconstruction of ancient platypus ...

  7. Kryoryctes - Wikipedia

    en.wikipedia.org/wiki/Kryoryctes

    Kryoryctes is a genus of prehistoric monotreme mammal from the Early Cretaceous Eumeralla Formation [1] of Victoria, Australia from the Otway Group of Dinosaur Cove.It is known only from a partial right humerus, estimated at 106 million years old, and contains one species, Kryoryctes cadburyi.