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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 , [ 17 ] although modified by connecting to a urogenital sac and having a separate anal region in most species. [ 18 ]
Paucituberculata / ˌ p ɔː s ɪ tj uː ˌ b ɜːr k j uː ˈ l eɪ t ə / is an order of South American marsupials.Although currently represented only by the seven living species of shrew opossums, this order was formerly much more diverse, with more than 60 extinct species named from the fossil record, particularly from the late Oligocene to early Miocene epochs.
The common spotted cuscus is about the size of a common house cat, weighing 1.5 to 6 kilograms (3.3 to 13.2 lb), body size about 35 to 65 centimetres (14 to 26 in) long, and a tail 32 to 60 centimetres (13 to 24 in) long. [5]
Modern marsupials are now understood to be an originally South American lineage that later reached Australia and diversified there in a massive adaptive radiation. [1] [2] Molecular data, including analysis of retrotransposon insertion sites in the nuclear DNA of a variety of marsupials, and the fossil evidence indicate that Ameridelphia might best be understood as an evolutionary grade.
The family Caenolestidae within the order Paucituberculata contains the seven surviving species of shrew opossum: small, shrew-like marsupials that are confined to the Andes mountains of South America. [1] The order is thought to have diverged from the ancestral marsupial line very early.
Analysis of retrotransposon insertion sites in the nuclear DNA of a variety of marsupials has shown that the South American monito del monte's lineage is the most basal of the superorder. [ 3 ] [ 4 ] The Australian australidelphians form a clade , for which the name Euaustralidelphia ("true Australidelphia") has been proposed (the branching ...
Marsupial#Evolutionary history To a section : This is a redirect from a topic that does not have its own page to a section of a page on the subject. For redirects to embedded anchors on a page, use {{ R to anchor }} instead .
Microbiotheriidae is a family of australidelphian marsupials represented by only one extant species, the monito del monte, and a number of extinct species known from fossils in South America, Western Antarctica, and northeastern Australia.