marsupial (märs
`pēəl), member of the order Marsupialia, or pouched mammals. With the exception of the New World opossums opossum (əpŏs`əm, pŏs`–)
..... Click the link for more information. and an obscure S American family (Caenolestidae), marsupials are now found only in Australia, Tasmania, New Guinea, and a few adjacent islands. They are generally distinguished from placental mammals by the absence of a placenta connecting the embryo with its mother, although in a few forms the female has a rudimentary placenta that functions for a short time. The embryo is nourished during its brief gestation by a fluid secreted by the mother's uterus. The young are born in a very undeveloped state; at birth the great gray kangaroo kangaroo, name for a variety of hopping marsupials , or pouched mammals, of the family Macropodidae, found in Australia, Tasmania, and New Guinea. The term is applied especially to the large kangaroos of the genus Macropus.
..... Click the link for more information. is about 1 in. (2.5 cm) long and the opossum about 1 1-2 in. (3.8 cm) long. Immediately after birth the young crawl to the mother's nipples and remain attached to them while continuing their development. As they are still too helpless to suckle, milk is squirted into them by the periodic contraction of muscles over the mother's mammary glands. In nearly all marsupials the female's nipples are covered by a pouch, or marsupium, formed by a fold of abdominal skin. Even after the suckling stage the young return at times to the pouch for shelter and transportation. In many species the young are carried on the mother's back after the suckling stage. In addition to having a less efficient reproductive system than the placental mammals, marsupials are of generally lower intelligence. They were once widespread over the earth, but were displaced in most regions as the more successful placental mammals evolved. The Australian region, which has been isolated from contact with other regions since the Cretaceous period, had almost no native placental mammals, and the marsupials were able to continue their evolution there without competition. They underwent an adaptive radiation adaptive radiation, in biology, the evolution of an ancestral species, which was adapted to a particular way of life, into many diverse species, each adapted to a different habitat.
..... Click the link for more information. in Australia comparable to that of placental mammals in the rest of the world, evolving many forms that superficially resemble various placental mammals and fill the same ecological niches. Thus, there are animals known as Tasmanian wolves (see thylacine thylacine (thī`ləsīn') or Tasmanian wolf, carnivorous marsupial , or pouched mammal, of Tasmania.
..... Click the link for more information. ), marsupial moles, marsupial mice, and native cats (see dasyure dasyure (dăs`ēy
..... Click the link for more information. ), which live very much like the correspondingly named placental mammals and, in many cases, are strikingly similar in appearance. See bandicoot bandicoot, small marsupial mammal native to Australia and nearby islands. There are 19 species in eight genera. Bandicoots have long, pointed, shrewlike faces; gray or brown fur; and long, bushy, ratlike tails.
..... Click the link for more information. , numbat numbat (nŭm`băt), small marsupial , of SW Australia, also known as the marsupial anteater.
..... Click the link for more information. , phalanger phalanger (fəlăn`jər)
..... Click the link for more information. , Tasmanian devil Tasmanian devil, extremely voracious marsupial , or pouched mammal, of the dasyure family, now found only on the island of Tasmania. The Tasmanian devil, Sarcophilus harrisi, formerly found also in Australia, is about 2 ft (60 cm) long, excluding the 12-in.
..... Click the link for more information. , wombat wombat, shy marsupial of Australia and Tasmania, related to the koala. The wombat is a thick-set animal with a large head, short legs (giving it a shuffling gait), and a very short tail. It is about 3 ft (91.5 cm) long.
..... Click the link for more information. .
marsupial
marsupial [mär′sü·pē·əl]
`pēəl), member of the order Marsupialia, or pouched mammals. With the exception of the New World opossums opossum (əpŏs`əm, pŏs`–)..... Click the link for more information. and an obscure S American family (Caenolestidae), marsupials are now found only in Australia, Tasmania, New Guinea, and a few adjacent islands. They are generally distinguished from placental mammals by the absence of a placenta connecting the embryo with its mother, although in a few forms the female has a rudimentary placenta that functions for a short time. The embryo is nourished during its brief gestation by a fluid secreted by the mother's uterus. The young are born in a very undeveloped state; at birth the great gray kangaroo kangaroo, name for a variety of hopping marsupials , or pouched mammals, of the family Macropodidae, found in Australia, Tasmania, and New Guinea. The term is applied especially to the large kangaroos of the genus Macropus.
..... Click the link for more information. is about 1 in. (2.5 cm) long and the opossum about 1 1-2 in. (3.8 cm) long. Immediately after birth the young crawl to the mother's nipples and remain attached to them while continuing their development. As they are still too helpless to suckle, milk is squirted into them by the periodic contraction of muscles over the mother's mammary glands. In nearly all marsupials the female's nipples are covered by a pouch, or marsupium, formed by a fold of abdominal skin. Even after the suckling stage the young return at times to the pouch for shelter and transportation. In many species the young are carried on the mother's back after the suckling stage. In addition to having a less efficient reproductive system than the placental mammals, marsupials are of generally lower intelligence. They were once widespread over the earth, but were displaced in most regions as the more successful placental mammals evolved. The Australian region, which has been isolated from contact with other regions since the Cretaceous period, had almost no native placental mammals, and the marsupials were able to continue their evolution there without competition. They underwent an adaptive radiation adaptive radiation, in biology, the evolution of an ancestral species, which was adapted to a particular way of life, into many diverse species, each adapted to a different habitat.
..... Click the link for more information. in Australia comparable to that of placental mammals in the rest of the world, evolving many forms that superficially resemble various placental mammals and fill the same ecological niches. Thus, there are animals known as Tasmanian wolves (see thylacine thylacine (thī`ləsīn') or Tasmanian wolf, carnivorous marsupial , or pouched mammal, of Tasmania.
..... Click the link for more information. ), marsupial moles, marsupial mice, and native cats (see dasyure dasyure (dăs`ēy
..... Click the link for more information. ), which live very much like the correspondingly named placental mammals and, in many cases, are strikingly similar in appearance. See bandicoot bandicoot, small marsupial mammal native to Australia and nearby islands. There are 19 species in eight genera. Bandicoots have long, pointed, shrewlike faces; gray or brown fur; and long, bushy, ratlike tails.
..... Click the link for more information. , numbat numbat (nŭm`băt), small marsupial , of SW Australia, also known as the marsupial anteater.
..... Click the link for more information. , phalanger phalanger (fəlăn`jər)
..... Click the link for more information. , Tasmanian devil Tasmanian devil, extremely voracious marsupial , or pouched mammal, of the dasyure family, now found only on the island of Tasmania. The Tasmanian devil, Sarcophilus harrisi, formerly found also in Australia, is about 2 ft (60 cm) long, excluding the 12-in.
..... Click the link for more information. , wombat wombat, shy marsupial of Australia and Tasmania, related to the koala. The wombat is a thick-set animal with a large head, short legs (giving it a shuffling gait), and a very short tail. It is about 3 ft (91.5 cm) long.
..... Click the link for more information. .
Bibliography
See H. Tyndale-Biscoe, Life of Marsupials (1973); A. K. Lee and A. Cockburn, Evolutionary Ecology of Marsupials (1985).
marsupial
Any mammal of the infraclass Marsupialia, characterized by premature birth and continued development outside the womb. The young remain attached to the mother's teats for a period corresponding to the late stages of fetal development of a placental mammal. More than 170 species (e.g., bandicoots, kangaroos, koalas, wombats) are found in Australia, New Guinea, and nearby islands. About 65 species of opossum occur in the Americas and seven species of ratlike marsupials in South America. Many species have a pouch (marsupium), a fold of skin covering the nipples on the mother's lower belly, where the young continue their development.
marsupial
any mammal of the order Marsupialia, in which the young are born in an immature state and continue development in the marsupium. The order occurs mainly in Australia and South and Central America and includes the opossums, bandicoots, koala, wombats, and kangaroos
marsupial [mär′sü·pē·əl]
(vertebrate zoology)
A member of the Marsupialia.
Having a marsupium.
Of, pertaining to, or constituting a marsupium.
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