Birth in marsupials

Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
R T GemmellJohn Nelson

Abstract

Birth is an event that allows the relatively immature marsupial to move from the internal environment of the uterus to the external environment of the pouch. The newborn marsupial passes down from the uterus to the urogenital sinus and then makes its way to the pouch and attaches to the teat at a very early stage of development. From the studies available, there appear to be three methods used by the newborn to move from the uterus to the pouch. In marsupials with a forward pouch such as the red kangaroo, tammar wallaby and the brushtail possum, the mother positions her urogenital sinus below the pouch and the newborn climb upward towards the pouch. The young climb with a swimming motion, moving the head from side-to-side and use the forearms in alternate strokes. In the bandicoot with a backward facing pouch, the mother positions the urogenital sinus above the pouch and the young slither down into the pouch. The young do not have a definite crawl, as seen with the macropodids and possum. The third method of birth has been observed in the marsupials without a definite pouch that have a mammary region that develops as the young grow in size. This type of pouch is observed in the dasyurids. The mother was noted to stand on four l...Continue Reading

References

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Citations

Feb 7, 2014·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Anastasia Beiriger, Karen E Sears
May 21, 2009·Evolution; International Journal of Organic Evolution·Diego Astúa
Jul 24, 2012·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Karen E SearsSheng Zhong
Feb 13, 2010·Journal of Morphology·Merla HublerKaren E Sears
Apr 28, 2011·Evolution; International Journal of Organic Evolution·Vera Weisbecker
Jul 29, 2010·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Carolyn K Doroba, Karen E Sears
Jan 22, 2013·Evolution & Development·Merla HüblerKaren E Sears
Sep 29, 2012·Evolution & Development·Karen E SearsMatthew B Wheeler
May 21, 2008·Evolution; International Journal of Organic Evolution·Vera WeisbeckerMarcelo R Sánchez-Villagra
May 21, 2009·Evolution; International Journal of Organic Evolution·Karen E Sears
May 17, 2013·Journal of Evolutionary Biology·K E SearsA L Beck
Nov 14, 2014·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Karen E Sears
Nov 26, 2004·Evolution; International Journal of Organic Evolution·Karen E Sears
Nov 3, 2017·Genesis : the Journal of Genetics and Development·Karen SearsDaniel J Urban
Feb 6, 2020·Evolution, Medicine, and Public Health·Zaneta M ThayerChristopher W Kuzawa
Nov 26, 2010·Development·Anna L Keyte, Kathleen K Smith
Apr 29, 2021·Proceedings. Biological Sciences·Anne-Claire FabreAnjali Goswami

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