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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...

    The class Mammalia is divided into two subclasses based on reproductive techniques: egg-laying mammals (yinotherians or monotremes - see also Australosphenida), and mammals which give live birth . The latter subclass is divided into two infraclasses: pouched mammals ( metatherians or marsupials ), and placental mammals ( eutherians , for which ...

  4. Category:Monotremes - Wikipedia

    en.wikipedia.org/wiki/Category:Monotremes

    This category contains articles about all taxa below the subclass/order Monotremata - the platypus, the echidnas, and extinct species which are only known via fossil evidence. Subcategories This category has the following 5 subcategories, out of 5 total.

  5. 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.

  6. Echidna - Wikipedia

    en.wikipedia.org/wiki/Echidna

    The four extant species of echidnas and the platypus are the only living mammals that lay eggs and the only surviving members of the order Monotremata. [3] The diet of some species consists of ants and termites, but they are not closely related to the American true anteaters or to hedgehogs. Their young are called puggles.

  7. List of placental mammals - Wikipedia

    en.wikipedia.org/wiki/List_of_placental_mammals

    The class Mammalia is divided into two subclasses based on reproductive techniques: monotremes, which lay eggs, and therians, mammals which give live birth, which has two infraclasses: marsupials/metatherians and placentals/eutherians. See List of monotremes and marsupials, and for the clades and families, see Mammal classification ...

  8. List of monotremes and marsupials of Australia - Wikipedia

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

    Australia is home to two of the five extant species of monotremes and the majority of the world's marsupials (the remainder are from Papua New Guinea, eastern Indonesia and the Americas). The taxonomy is somewhat fluid; this list generally follows Menkhorst and Knight [ 1 ] and Van Dyck and Strahan, [ 2 ] with some input from the global list ...

  9. Opalios - Wikipedia

    en.wikipedia.org/wiki/Opalios

    In 2024, Flannery et al. described Opalios splendens as a new genus and species of early monotreme based on these fossil remains. They erected the new monotypic family Opalionidae within the Ornithorhynchoidea —the superfamily also containing modern echidnas and platypus —to house Opalios due to its similarity to both of these extant lineages.