Marsupial - Wikipedia
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]
Reproductive Strategies and Biology of the Australasian Marsupials
In general, marsupial reproduction is characterized by a very short pregnancy, production of small altricial young (young at a very early stage of development), and a relatively long lactation period, compared with eutherian mammals. Female marsupials carry their young in a pouch or pouch-like structure, with a period of permanent teat attachment.
Marsupial | Definition, Characteristics, Animals, & Facts | Britannica
2024年12月18日 · Marsupial, any of more than 250 species belonging to the infraclass Metatheria (sometimes called Marsupialia), a mammalian group characterized by premature birth and continued development of the newborn while attached …
Marsupials the alternative therians – From gametes to birth
2020年7月1日 · Marsupial reproduction, with hairless ‘embryo-like’ young developing in an external pouch was recognised as unique, but where they fitted in the world of mammals was unclear for many years because of their remarkably similar body forms and biology to the familiar eutherian mammals.
Reproductive physiology of marsupials: Breeding biology of marsupials …
This review will show how the study of marsupials has widened the understanding of mammalian reproduction and development, highlighting some mechanisms that are so fundamental that they are shared by all today's marsupial and eutherian mammals.
Reproduction (Chapter 3) - Marsupials - Cambridge University …
Male reproductive systems of marsupials are like those of eutherian mammals in most respects (Setchell 1977, Tyndale-Biscoe and Renfree 1987). They consist essentially of the testes where the sperm are made, a specialised duct system that conveys the sperm to the outside, and a set of secretory glands that provide the bulk of the seminal fluid.
Reproduction of a marsupial: From uterus to pouch
1996年4月1日 · Parturition in marsupials is a remarkable process because the maternal endocrine system must be able to respond to signals from the tiny altricial neonate which may be as small as 5 mg (honey possum) or as ‘large’ as 800 mg (red and grey kangaroos).
Theria: Marsupials, Placentals, and Their Unique Reproductive ...
2024年7月5日 · Marsupials and placentals represent two distinct groups within the subclass Theria, known for their unique reproductive strategies that have fascinated biologists for centuries. Understanding these differences provides crucial insights into evolutionary biology and mammalian physiology.
Marsupial Reproduction - TrishansOz
2022年9月12日 · All female marsupials, such as a koalas, kangaroos etc., have three vaginas and two uteruses. Male marsupials, except the macropods such as kangaroos and wallabies, have a two-pronged penis. Baby marsupials are not born in the mother's pouch. Instead, they are born through the mother's birth canal and crawl their way up her body to her pouch.
Reproductive Disorders of Marsupials - PubMed
Marsupial reproduction differs significantly in anatomy and physiology from that of placental mammals. The gastrointestinal and urogenital tracts empty into a cloaca. Reproductive parameters include gestation and pouch time, as the fetus develops outside of the uterus. Captive marsupials discussed i …