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juramaia sinensis, juramaia
Juramaia is an extinct genus of very basal eutherian mammal from the Late Jurassic Oxfordian stage deposits of western Liaoning, China; it is a small shrew-like mammal of body length approximately 70–100 mm[1][2] Juramaia is known from the holotype BMNH PM1343, an articulated and nearly complete skeleton including incomplete skull preserved with full dentition


  • 1 Discovery
  • 2 Evolution
  • 3 Classification
  • 4 See also
  • 5 References
  • 6 External links


It was collected in the Daxigou site, Jianchang, from the Tiaojishan Formation dated at about 160 million years ago[3] It was first named by Zhe-Xi Luo, Chong-Xi Yuan, Qing-Jin Meng and Qiang Ji in 2011 and the type species is Juramaia sinensis[4]


The discovery of Juramaia provides new insight into the evolution of placental mammals by showing that their lineage diverged from that of the marsupials 35 million years earlier than previously thought[4] Furthermore, its discovery fills gaps in the fossil record and helps to calibrate modern, DNA-based methods of dating the evolution[5][6] Based on climbing adaptations found in the forelimb bones, it has been suggested that the basal stock of Eutheria was arboreal,[4] in a manner resembling that of modern rats[7]



Sinodelphys szalayi

Cenozoic metatherian


Juramaia sinensis

Montanalestes keeblerorum

Murtoilestes abramovi

Eomaia scansoria

Prokennalestes trofimovi

Cenozoic placentalia

See also

  • Eomaia


  1. ^ Juramaia sinensis - 160-Million-Year-Old Fossil Pushes Back Mammal Evolution
  2. ^ Welsh, Jennifer 24 August 2011 "Skinny 'Shrew' Is Oldest True Mammal" LiveScience Retrieved 5 December 2017 
  3. ^ Chu, Z; He, H; Ramezani, J; Bowring, SA; Hu, D; Zhang, L; Zheng, S; Wang, X; Zhou, Z; Deng, C; Guo, J 2016 "High-precision U-Pb geochronology of the Jurassic Yanliao Biota from Jianchang western Liaoning Province, China: Age constraints on the rise of feathered dinosaurs and eutherian mammals" Geochemistry, Geophysics, Geosystems 17: 3983–3992 doi:101002/2016GC006529 
  4. ^ a b c Zhe-Xi Luo, Chong-Xi Yuan, Qing-Jin Meng and Qiang Ji 25 August 2011 "A Jurassic eutherian mammal and divergence of marsupials and placentals" PDF Nature 476: 442–445 doi:101038/nature10291 PMID 21866158 Archived from the original PDF on 10 November 2013 CS1 maint: Uses authors parameter link Electronic supplementary material
  5. ^ "Fossil redefines mammal history" BBC News
  6. ^ Discovery of a 160-million-year-old fossil represents a new milestone in early mammal evolution
  7. ^ Bonnan MF, Shulman J, Varadharajan R, Gilbert C, Wilkes M, Horner A et al 2 March 2016 "Forelimb Kinematics of Rats Using XROMM, with Implications for Small Eutherians and Their Fossil Relatives" PLoS ONE 11 3: e0149377 doi:101371/journalpone0149377 PMC 4775064  PMID 26933950 CS1 maint: Uses authors parameter link CS1 maint: Explicit use of et al link

External links

  • 'Jurassic Mother' Found in China: Discovery News
  • Juramaia sinensis - 160-Million-Year-Old Fossil Pushes Back Mammal Evolution
  • Paleobiology Database: Juramaia sinensis

juramaia, juramaia mammal during jurassic period, juramaia sinensis, juramaia size

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    Juramaia beatiful post thanks!


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