Monito del Monte Development
|Embryology - 4 Apr 2020 Expand to Translate|
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Monito del monte (Dromiciops gliroides) are small nocturnal marsupials representatives of the ancient order Microbiotheria and also the only known hibernating mammal in South America (Southern Chile and Argentina). Thomas, 1894 original designation Monito del monte (Spanish = "little mountain monkey") or colocolo opossum. Their distribution is within Chile and adjacent Argentina from about 36S to near 43S.
- Links: Category:Marsupial
Some Recent Findings
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This table allows an automated computer search of the external PubMed database using the listed "Search term" text link.
Search term: Monito del monte
<pubmed limit=5>Monito del monte</pubmed>
<pubmed limit=5>Dromiciops gliroides</pubmed>
Genbank common name: opossum
Genetic code: Translation table 1 (Standard)
Mitochondrial genetic code: Translation table 2 (Vertebrate Mitochondrial)
Lineage ( full )
cellular organisms; Eukaryota; Opisthokonta; Metazoa; Eumetazoa; Bilateria; Deuterostomia; Chordata; Craniata; Vertebrata; Gnathostomata; Teleostomi; Euteleostomi; Sarcopterygii; Dipnotetrapodomorpha; Tetrapoda; Amniota; Mammalia; Theria; Metatheria; Microbiotheria; Microbiotheriidae; Dromiciops
Adult female can produce one litter of a maximum of 4 infants per year. Data below from a 2005 study.
- Intra-uterine development - (3-4 weeks) blastocyst implantation, marsupium development is marked by teat enlargement and formation of lactating tissue.
- parturition - neonates migrate from the vagina to the marsupium.
- intra-marsupium - (2 months) pouched young seem to remain within the marsupium and firmly affixed to teats.
- extra-marsupium - (juvenile) Increased motor capacities allow pouched young to leave the marsupium for short exploratory excursions.
Choriovitelline placenta - chorion is formed by the fusion of yolk-sac mesoderm and vessels to the inner face of the serosa.
- Links: Placenta Development
The marsupial neonate at birth has a variation between the degree of development of different systems.
- well-developed - digestive, respiratory and circulatory system.
- not well-developed - retains fetal excretory system with a fully functional mesonephric kidney and undifferentiated gonads and genitalia.
- Links: Oocyte Development
Spermatozoa morphology: Head cuneiform, acrosome restricted to anterior third of dorsal surface of nucleus, midpiece not preserved; spermatozoan pairing not determined; the single head said to be similar to that of Australian Trichosurus vulpecula (Phalangeridae).  Sperm pairing is found in all South American marsupials except Dromiciops gliroides  and has never been observed in any Australian marsupials. Sperm pairing was first described for the Virginian opossum (Didelphis virginiana)  and described as a post-testicular event (Biggers and Creed, 1962) that occurs as spermatozoa passes through the epididymis. It is a feature present in all American marsupials except Dromiciops gliroides.
- Links: Spermatozoa Development
- Muñoz-Pedreros A, Lang, BK Marta Bretos, M. and Meserve, PL. Reproduction and Development of the Monito del Monte, Dromiciops gliroides Thoma (marsupialia: Microbiotheriidae) in Temperate Rainforests of Southern Chile. (2005) Gayana 69(2):225-233 DOI: 10.4067/S0717-65382005000200002 PDF
- Hershkovitz, P. (1999). Dromiciops gliroides Thomas, 1894, Last of the Microbiotheria (Marsupialia), with a Review of the Family Microbiotheriidae. Fieldiana. Zoology, (93), 1-60.
- Selenka, E. (1887). Part 4. Das Opossum (Didelphis virginiana); in: Studien über die Entwickelungsgeschichte der Thiere. Wiesbaden, Kreidels
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Muñoz-Pedreros A, Lang, BK Marta Bretos, M. and Meserve, PL. Reproduction and Development of the Monito del Monte, Dromiciops gliroides Thoma (marsupialia: Microbiotheriidae) in Temperate Rainforests of Southern Chile. (2005) Gayana 69(2):225-233 DOI: 10.4067/S0717-65382005000200002 PDF
Brown BE. Atlas of New World marsupials (2004) Field Museum of Natural History.
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Cite this page: Hill, M.A. (2020, April 4) Embryology Monito del Monte Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Monito_del_Monte_Development
- © Dr Mark Hill 2020, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G