Ruqayyah Snyder
Monotremes are an anomaly in the animal kingdom, as they are mammals that lay eggs and have no teats. They are only found in Australia and New Guinea, and comprise just two species: the platypus and the echidna. These species are the last survivors of a diverse set of species that once roamed the southern continents. Australia is the world capital of two of the three types of mammals on Earth: marsupials, like the kangaroo and koala, and monotremes.
| Characteristics | Values |
|---|---|
| Are monotremes only found in Australia? | No, monotremes are found in Australia and New Guinea |
| Species of monotremes | Platypus and Echidna |
| Habitat of platypus | Freshwater systems on the eastern coast of Australia |
| Habitat of echidna | Tasmania, East Gippsland, Kangaroo Island, Maria Island |
| Interesting facts about platypus | Platypuses are famed for their bills, which are full of electroreceptors that assist them in finding food |
| Interesting facts about echidna | Echidnas are famous for their sharp spines and their ability to adapt to different conditions |
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![The Larynx in Australian Marsupials and Monotreme, from the Australian Institute of Anatomical Research, Melbourne 1921 [Leather Bound]](https://m.media-amazon.com/images/I/617DLHXyzlL._AC_UL320_.jpg)
What You'll Learn
Monotremes are only found in Australia and New Guinea
Monotremes are mammals that lay eggs and have no teats. They are iconic Australasian species, with the platypus and echidna being the only surviving monotremes today. These species are found only in Australia and New Guinea.
Australia is the world capital of two of the three types of mammals: marsupials, like kangaroos and koalas, which nourish their young in pouches, and monotremes, which nourish their young in eggs. The third type is placental mammals, which include everything else, from mice to whales to humans, which nourish their young in an advanced placenta.
The platypus is found in freshwater systems on the eastern coast of Australia, including Tasmania, East Gippsland, Atherton Tablelands, and the Southern Highlands. Platypuses are known for their bills, which are full of electroreceptors that help them find food. They are generally very shy and elusive creatures, and the best times to spot them are at dawn or dusk.
The Short-beaked Echidna is the only mammal found across the entire Australian continent, from snowy conditions to arid deserts. They are known for their sharp spines, but they are also covered in fur. In Tasmania, their fur is longer and blends in with their spines. Some of the best places to spot Short-beaked Echidnas include East Gippsland, Kangaroo Island, and Tasmania (including Maria Island).
The question remains as to why monotremes are only found in Australia and New Guinea. One theory suggests that monotremes were once able to roam the southern continents but became highly specialised to their polar niche in the south-eastern corner of Australia, making it difficult for them to live anywhere else. Another theory, regarding the echidna specifically, suggests that they migrated to Australia from New Guinea during the last Ice Age.
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The platypus is a type of monotreme
Monotremes are a highly specialised group of egg-laying predatory mammals that are indigenous to Australia and New Guinea. They are the only group of living mammals that lay eggs, rather than bearing live young. They are also characterised by their lack of teats, extra bones in the shoulder girdle, and a single duct (the cloaca) for their urinary, defecatory, and reproductive systems.
Platypuses are classified under the family Ornithorhynchidae, with a single species in a single genus, Ornithorhynchus anatinus. The other monotreme family is Tachyglossidae, which includes the four species of echidnas.
Platypuses are toothless, like all monotremes, and have a different jaw structure from other mammals. They also have a different middle ear structure, with three bones: the incus, malleus, and stapes. In addition, they have epipubic bones—two thin rod-like bones extending anteriorly from the pubic bones of the pelvic girdle.
The sequencing of the platypus genome has provided valuable insights into the evolution of monotreme traits, such as venom and electroreception, as well as unique features like the possession of five pairs of sex chromosomes. This research has also suggested that the two sex chromosomes of marsupials and placentals evolved after the split from the monotreme lineage.
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The echidna is another type of monotreme
Monotremes are mammals that lay eggs and have no teats. They are unique to Australia and New Guinea. The platypus and the echidna are the two living monotremes.
Echidnas are egg-laying mammals, and their young are called puggles. Female echidnas do not have teats, but they secrete milk through pores on their undersides. Echidnas have a lower average temperature than most mammals and can "switch off" their temperature regulation during cold weather to conserve energy. They have a relatively small amount of electroreceptors in their snouts compared to platypuses, with only 400-2,000 compared to 40,000 in platypuses.
Echidnas are found in a variety of habitats, including forests, woodlands, heaths, grasslands, and arid environments. Some of the best regions for spotting short-beaked echidnas include East Gippsland, Kangaroo Island, and Tasmania (including Maria Island). In Tasmania, male echidnas have been observed pursuing a single female in single file, with up to 10 males hoping to mate with her.
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The echidna is the only mammal found across the entire Australian continent
Australia is the world capital of two of the three types of mammal: the marsupials, like the kangaroo and koala, and the monotremes, featuring the platypus and the echidnas. Marsupials are mammals that nourish their young in pouches, while monotremes are mammals that lay eggs and have no teats. The Short-beaked Echidna is the only mammal found across the entire Australian continent.
The Short-beaked Echidna is able to adapt to a variety of climates, from snowy conditions to harsh arid deserts. Echidnas are well known for their sharp spines, but they are also covered in fur. In Tasmania, their fur is longer and blends in with their spines. Echidnas can flick their tongues up to 100 times per minute to lap up ants and termites with great skill. Some of the best regions for spotting Short-beaked Echidnas include East Gippsland, Kangaroo Island and Tasmania (including Maria Island).
The Platypus is Australia's other monotreme, found in freshwater systems on the eastern coast of Australia. Platypuses are famous for their bills, which are full of electroreceptors that help them find molluscs, crustaceans and other invertebrates in the mud. Platypuses can also be found throughout Tasmania, East Gippsland, Atherton Tablelands and the Southern Highlands, but they are generally very shy and elusive creatures.
Echidnas are found in the Australian fossil record going back only two million years, yet genetic studies indicate that echidnas evolved from platypus-like ancestors tens of millions of years before that. Echidnas are thought to have originated on an island in what is now New Guinea, and to have reached Australia during a time of faunal exodus at the onset of the last Ice Age. Today, monotremes are only found in Australia and New Guinea, and they are the last survivors of a diverse set of species that once roamed the southern continents.
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Monotremes are egg-laying mammals
The name Monotremata means "one-holed", referring to the fact that both male and female monotremes have a single opening at the rear of the body, used for reproduction and excretion. This is a key anatomical difference between monotremes and other mammals. In contrast, marsupials have a separate genital tract, while most placental females have separate openings for reproduction, urination, and defecation.
Monotremes have a combination of primitive features and specialized characteristics, which makes it difficult to determine their relationships to other mammalian groups. For example, monotremes have extra bones in the shoulder girdle, including an interclavicle and coracoid, which are not found in other mammals. They also retain a reptile-like gait, with legs on the sides of their bodies rather than underneath.
The presence of vitellogenin genes, which are necessary for egg yolk formation, suggests that the common ancestor of monotremes, marsupials, and placentals was oviparous. DNA analyses indicate that platypuses are indeed mammals, and that this common ancestor lactated.
Monotremes are highly modified for their ecological niches. For example, the platypus is a semi-aquatic carnivore-insectivore, with a bill full of electroreceptors to assist in finding prey. Echidnas have a specialized diet of small invertebrates and are covered in sharp spines and fur.
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Frequently asked questions
No, monotremes are found in Australia and New Guinea.
Monotremes are egg-laying mammals. They are one of the two subclasses of mammals, the other being live-birth mammals.
The platypus and the echidna are the two species of monotremes that exist today.
