Difference between revisions of "Kangaroo Development"
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Revision as of 12:52, 13 February 2017
|Embryology - 6 Mar 2021 Expand to Translate|
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Macropodid marsupial have short five digit forelimbs and large four digit hindlimbs specially adapted for hopping. The hindlimb digits differ from mammals by a missing digit 1, fused digits 2 and 3 and an elongated digit 4.
- tammar wallaby (Macropus eugenii)
|Australian Animal: echidna | kangaroo | koala | platypus | possum | Category:Echidna | Category:Kangaroo | Category:Koala | Category:Platypus | Category:Possum | Category:Marsupial | Category:Monotreme | Development Timetable | K12|
|Animal Development: axolotl | bat | cat | chicken | cow | dog | dolphin | echidna | fly | frog | goat | grasshopper | guinea pig | hamster | horse | kangaroo | koala | lizard | medaka | mouse | opossum | pig | platypus | rabbit | rat | sea squirt | sea urchin | sheep | worm | zebrafish | life cycles | development timetable | development models | K12|
Some Recent Findings
Taxonomy ID: 9322
Genbank common name: kangaroo
Inherited blast name: marsupials
Genetic code: Translation table 1 (Standard)
Mitochondrial genetic code: Translation table 2 (Vertebrate Mitochondrial)
Lineage ( full )
cellular organisms; Eukaryota; Opisthokonta; Metazoa; Eumetazoa; Bilateria; Coelomata; Deuterostomia; Chordata; Craniata; Vertebrata; Gnathostomata; Teleostomi; Euteleostomi; Sarcopterygii; Tetrapoda; Amniota; Mammalia; Theria; Metatheria; Diprotodontia; Macropodidae; Macropus
- Links: Taxonomy Browser Macropus
- short pregnancy period (tammar wallaby 26.5 days)
- pregnancy can be maternally delayed (diapause) at blastocyst stage
- born in altricial (underdeveloped) state
- development continues attached to a teat in the pouch
- during pouch period growth controlled by milk composition changes
- immune system, thyroid and thermoregulation develops after birth
The following images are from a recent paper on placental evolution.
Tammar Wallaby Limb Development
The development of tammar fetal limbs at selected stages before birth. (A) day 19, (B) day 20, (C) day 22, (D) day 24 and (E) day 25 (one day before birth).
- Tammar Limbs: day 19-25 | day 19 | day 20 | day 22 | day 24 | day 25 | Limb Development | Kangaroo Development
The tammar wallaby karyotype (2 n = 16) consists of 7 autosomes and the two sex chromosomes.
The following data is from the tammar wallaby (Macropus eugenii) study.
- migrate caudally between days 10 and 20 after birth.
- gubernaculum differentiates into:
- round ligament in the abdomen
- extra-abdominally as the ilio-marsupialis muscle of the mammary glands.
- migrate to the internal inguinal ring by day 20 post partum (pp).
- migrate then to the scrotum between days 20 and 65 pp.
- cremaster muscle development begins day 10 pp and structure completed by day 60 pp.
- inguinal canal closed between days 50 and 60 pp.
Rock-wallaby Australian taxa distribution
|Taxa are colored in accordance with their chromosomal groupings:
Mitochondrial coding genes - 12 genes, 11,373 bp.
- <pubmed>22132805 </pubmed>
- <pubmed>21854559</pubmed>Genome Biol.
- <pubmed>21854600</pubmed>| PMC3170617 | Evodevo.
- <pubmed>22235805</pubmed>| BMC Dev Biol.
- <pubmed>17822525</pubmed>| BMC Evol Biol.
- Potter S, Bragg JG, Blom MPK, Deakin JE, Kirkpatrick M, Eldridge MDB and Moritz C (2017) Chromosomal Speciation in the Genomics Era: Disentangling Phylogenetic Evolution of Rock-wallabies. Front. Genet. 8:10. doi: 10.3389/fgene.2017.00010
<pubmed>21672208</pubmed> <pubmed>21540568</pubmed> <pubmed>18431054</pubmed> <pubmed>18322362</pubmed> <pubmed>18069991</pubmed> <pubmed>12220120</pubmed> <pubmed>4791592</pubmed>
- Life of Marsupials by Hugh Tyndale-Biscoe Publisher: CSIRO Publishing (2005).
- Kangaroo - A Portrait of an Extraordinary Marsupial by Stephen Jackson and Karl Vernes Publisher: Allen & Unwin (2010).
External Links Notice - The dynamic nature of the internet may mean that some of these listed links may no longer function. If the link no longer works search the web with the link text or name. Links to any external commercial sites are provided for information purposes only and should never be considered an endorsement. UNSW Embryology is provided as an educational resource with no clinical information or commercial affiliation.
- NSW Government Information
- Newborn Baby Grey Kangaroo - Attenborough - Life of Mammals - BBC video
- Birth of the Red Kangaroo (1965) - CSIRO video 1 | video 2 video 3
- NHMRC A guide to the use of Australian native mammals in Biomedical research (1990) - PDF
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Cite this page: Hill, M.A. (2021, March 6) Embryology Kangaroo Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Kangaroo_Development
- © Dr Mark Hill 2021, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G