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A model of the extinct monotreme Steropodon at the Australian Museum. The first Mesozoic monotreme to be discovered was the Cenomanian (100–96.6 Ma) Steropodon galmani from Lightning Ridge, New South Wales. [60] Biochemical and anatomical evidence suggests that the monotremes diverged from the mammalian lineage before the marsupials 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 ().
Mammals are divided into two subclasses based on reproductive techniques: egg laying mammals (the monotremes), and live birth mammals. The second subclass is divided into two infraclasses: pouched mammals (the marsupials) and placental mammals.
The largest known monotreme (egg-laying mammal) ever was the extinct long-beaked echidna species known as Murrayglossus hacketti, known from a couple of bones found in Western Australia. It was the size of a sheep, weighing probably up to 30 kg (66 lb). [37]
Though only from a few bones, researchers suggest that Murrayglossus was the largest monotreme to have ever lived, measuring around 1 metre (3.3 ft) long and weighing around 20–30 kilograms (44–66 lb). [1] [2] Historically treated as a species of long-beaked echidnas, [1] [3] it was separated into its own genus Murrayglossus in 2022.
Monotreme stubs (5 P) Pages in category "Monotremes" The following 10 pages are in this category, out of 10 total. This list may not reflect recent changes. ...
Steropodon is a genus of prehistoric platypus-like monotreme, or egg-laying mammal. It contains a single species, Steropodon galmani, that lived about 100.2–96.6 million years ago during the Cretaceous period, from early to middle Cenomanian. [1] It is one of the oldest monotremes discovered, and is one of the oldest Australian mammal ...
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.