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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.
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 ...
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.
Today, there are only five surviving species of monotremes which live in Australia and New Guinea, consisting of the platypus and four species of echidna. Fossils of yinotheres have been found in Britain, China, Russia, Madagascar and Argentina. Contrary to other known crown mammals, they retained postdentary bones as shown by the presence of a ...
"Who Is Alive?" is the third episode of the second season of the American science fiction psychological thriller television series Severance. It is the 12th overall episode of the series and was written by producer Wei-Ning Yu, and directed by executive producer Ben Stiller. It was released on Apple TV+ on January 31, 2025.
Monotrematum sudamericanum is known only from two lower and one upper platypus-like teeth.It is the only known non-Australasian ornithorhynchid.The main difference, apart from continent and age, is its size: the teeth of Monotrematum are around twice as large as those of other similar species in the related genus Obdurodon.
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.