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Marsupials' reproductive systems differ markedly from those of placental mammals. In bandicoots , an additional chorioallantoic placenta forms, although it lacks the chorionic villi found in eutherian placentas. The evolution of reproduction in marsupials, and speculation about the ancestral state of mammalian reproduction , have engaged discussion since the end of the 19th century. Both sexes possess a cloaca ,  which is connected to a urogenital sac used to store waste before expulsion.
The bladder of marsupials functions as a site to concentrate urine and empties into the common urogenital sinus in both females and males. Most male marsupials, except for macropods  and marsupial moles ,  have a bifurcated penis, separated into two columns, so that the penis has two ends corresponding to the females' two vaginas.
The male thylacine had a pouch that acted as a protective sheath, covering his external reproductive organs while he ran through thick brush. The shape of the urethral grooves of the males' genitalia is used to distinguish between Monodelphis brevicaudata , Monodelphis domestica , and Monodelphis americana. The grooves form 2 separate channels that form the ventral and dorsal folds of the erectile tissue.
The only accessory sex glands marsupials possess are the prostate and bulbourethral glands. However, there does not appear to be any seasonal difference in the weight of the testes. Female marsupials have two lateral vaginas , which lead to separate uteri , but both open externally through the same orifice. A third canal, the median vagina, is used for birth. This canal can be transitory or permanent. Marsupials give birth at a very early stage of development; after birth, newborn marsupials crawl up the bodies of their mothers and attach themselves to a nipple, which is located on the underside of the mother, either inside a pouch called the marsupium , or open to the environment.
There they remain for a number of weeks, attached to the nipple. The offspring are eventually able to leave the marsupium for short periods, returning to it for warmth, protection, and nourishment. An early birth removes a developing marsupial from its mother's body much sooner than in placental mammals, thus marsupials have not developed a complex placenta to protect the embryo from its mother's immune system. Though early birth puts the tiny newborn marsupial at a greater environmental risk, it significantly reduces the dangers associated with long pregnancies, as there is no need to carry a large fetus to full term in bad seasons.
Marsupials are extremely altricial animals, needing to be intensely cared for immediately following birth cf. Because newborn marsupials must climb up to their mother's nipples, their front limbs and facial structures are much more developed than the rest of their bodies at the time of birth. Marsupials must develop grasping forepaws during their early youth, making the evolutive transition from these limbs into hooves , wings , or flippers , as some groups of placental mammals have done, more difficult.
However, several marsupials do possess atypical forelimb morphologies, such as the hooved forelimbs of the pig-footed bandicoot , suggesting that the range of forelimb specialization is not as limited as assumed.
An infant marsupial is known as a joey. Marsupials have a very short gestation period about four to five weeks , and the joey is born in an essentially fetal state.
The blind, furless, miniature newborn, the size of a jelly bean ,  crawls across its mother's fur to make its way into the pouch , where it latches onto a teat for food. It will not re-emerge for several months, during which time it develops fully. After this period, the joey begins to spend increasing lengths of time out of the pouch, feeding and learning survival skills. However, it returns to the pouch to sleep, and if danger threatens, it will seek refuge in its mother's pouch for safety.
Joeys stay in the pouch for up to a year in some species, or until the next joey is born. A marsupial joey is unable to regulate its own body temperature and relies upon an external heat source. Joeys are born with "oral shields". In species without pouches or with rudimentary pouches these are more developed than in forms with well-developed pouches, implying a role in maintaining the young attached to the mother's nipple. The first American marsupial the Europeans encountered was the common opossum.
He presented them to the Spanish monarchs, though by then the young were lost and the female had died. The animal was noted for its strange pouch or "second belly", and how the offspring reached the pouch was a mystery.
On the other hand, it was the Portuguese who first described Australian marsupials. Some animals resemble ferrets, only a little bigger. They are called Kusus. They have a long tail with which they hang from the trees in which they live continuously, winding it once or twice around a branch.
On their belly they have a pocket like an intermediate balcony; as soon as they give birth to a young one they grow it inside there at a nipple until it does not need nursing anymore.
As soon as she has borne and nourished it, the mother becomes pregnant again. From the start of the 17th century more accounts of marsupials arrived.
For instance, a record of an animal, killed on the southern coast of New Guinea, described it as "in the shape of a dog, smaller than a greyhound", with a snakelike "bare scaly tail" and hanging testicles. The meat tasted like venison , and the stomach contained ginger leaves.
This description appears to closely resemble the dusky pademelon Thylogale brunii , in which case this would be the earliest European record of a member of the kangaroo family Macropodidae. The relationships among the three extant divisions of mammals monotremes , marsupials, and placentals were long a matter of debate among taxonomists. The ancestors of marsupials, part of a larger group called metatherians , probably split from those of placental mammals eutherians during the mid- Jurassic period, though no fossil evidence of metatherians themselves are known from this time.
The oldest metatherian fossils are found in present-day China. From there, metatherians spread westward into modern North America still attached to Eurasia , where the earliest true marsupials are found.
Marsupials are difficult to distinguish from other fossils, as they are characterized by aspects of the reproductive system which do not normally fossilize including pouches and by subtle changes in the bone and tooth structure that show a metatherian is part of the marsupial crown group the most exclusive group that contains all living marsupials. The earliest definite marsupial fossil belongs to the species Peradectes minor , from the Paleocene of Montana , dated to about 65 million years ago.
Marsurpials, Peradectes and the related Herpetotheriidae are nested within a clade of metatherians that also included a variety of Cretaceous North American taxa. In South America, the opossums evolved and developed a strong presence, and the Paleogene also saw the evolution of shrew opossums Paucituberculata alongside non-marsupial metatherian predators such as the borhyaenids and the saber-toothed Thylacosmilus.
South American niches for mammalian carnivores were dominated by these marsupial and sparassodont metatherians. While placental predators were absent, the metatherians did have to contend with avian terror bird and terrestrial crocodylomorph competition. South America and Antarctica remained connected until 35 mya, as shown by the unique fossils found there. North and South America were disconnected until about three million years ago, when the Isthmus of Panama formed.
This led to the Great American Interchange. Sparassodonts disappeared for unclear reasons — again, this has classically assumed as competition from carnivoran placentals, but the last sparassodonts co-existed with a few small carnivorans like procyonids and canines, and disappeared long before the arrival of macropredatory forms like felines,  while didelphimorphs opossums invaded Central America, with the Virginia opossum reaching as far north as Canada.
Marsupials reached Australia via Antarctica about 50 mya, shortly after Australia had split off. This suggests a single dispersion event of just one species, most likely a relative to South America's monito del monte a microbiothere , the only New World australidelphian. This progenitor may have rafted across the widening, but still narrow, gap between Australia and Antarctica. In Australia, they radiated into the wide variety seen today. Modern marsupials appear to have reached the islands of New Guinea and Sulawesi relatively recently via Australia.
The branching sequence of marsupial orders indicated by the study puts Didelphimorphia in the most basal position, followed by Paucituberculata, then Microbiotheria, and ending with the radiation of Australian marsupials.
This indicates that Australidelphia arose in South America, and reached Australia after Microbiotheria split off. In Australia, terrestrial placental mammals disappeared early in the Cenozoic their most recent known fossils being 55 million-year-old teeth resembling those of condylarths for reasons that are not clear, allowing marsupials to dominate the Australian ecosystem.
A new hypothesis suggests that South American microbiotheres resulted from a back-dispersal from eastern Gondwana due to new cranial and post-cranial marsupial fossils from the Djarthia murgonensis from the early Eocene Tingamarra Local Fauna in Australia that indicate the Djarthia murgonensis is the most plesiomorphic, the oldest unequivocal australidelphian, and may be the ancestral morphotype of the Australian marsupial radiation.
From Wikipedia, the free encyclopedia. This article is about the mammals. For frogs, see Marsupial frog. This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. September Learn how and when to remove this template message.
The sugar glider , a marsupial, left and flying squirrel , a rodent , right are examples of convergent evolution. This section may contain content that is repetitive or redundant of text elsewhere in the article. Please help improve it by merging similar text or removing repeated statements. Geological time scale of marsupial evolution. First Europeans visit Australia in , settlements begin in Dingo introduced ya. Thylacine and Tasmanian devil subsequently disappear from Australian mainland.
Last glacial maximum 18,—20, ya Extinction of megafauna 45,—55, ya. Growing diversity in grazing marsupials as a result of grasslands and arid habitats development. First appearance of large marsupials. Icehouse conditions result in the number of forest and forest-dwelling marsupials to decrease. Greenhouse conditions in Australia result in great diversity of Australian marsupials. Australia separates from Antarctica.
High marsupial diversity in South America. Appearance of the oldest Australian marsupial in late Paleocene. Dinosaurs are wiped off the Earth after an asteroid collision.
The northern landmass, Laurasia , is inhabited by marsupials. Some of them start dispersing to South America. Break apart of the great southern landmass, Gondwana. Marsupials and placentals diverge. First mammals appear in late Triassic in the supercontinent, Pangaea. Taxonomy of Australian Mammals. Mammal Species of the World: A Taxonomic and Geographic Reference 3rd ed. Johns Hopkins University Press. Australian National University Press. That's why you need to look around our site and find a few Perth escorts that catch your attention.
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