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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 ...
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 ...
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.
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.
[2] [3] Multituberculates are usually placed as crown mammals outside either of the two main groups of living mammals—Theria, including placentals and marsupials, and Monotremata [4] —but usually as closer to Theria than to monotremes. [5] [6] They are considered to be closely related to Euharamiyida and Gondwanatheria as part of Allotheria.
Pope Francis used a highly derogatory term towards the LGBT community as he reiterated in a closed-door meeting with Italian bishops that gay people should not be allowed to become priests ...
The monotremes, including the semi-aquatic platypus and the terrestrial echidnas, are one of the only groups of mammals that have evolved electroreception. While the electroreceptors in fish and amphibians evolved from mechanosensory lateral line organs, those of monotremes are based on cutaneous glands innervated by trigeminal nerves.
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.