It was collected in the Daxigou site, Jianchang, from the Tiaojishan Formation dated at about 160 million years ago.[4] 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.[5]
Evolution
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.[5] Furthermore, its discovery fills gaps in the fossil record and helps to calibrate modern, DNA-based methods of dating the evolution.[6][7] Based on climbing adaptations found in the forelimb bones, it has been suggested that the basal stock of Eutheria was arboreal,[5] in a manner resembling that of modern rats.[8]
^. Archived from the original on 2012-03-27. Retrieved 2011-09-09.
^Welsh, Jennifer (24 August 2011). "Skinny 'Shrew' Is Oldest True Mammal". LiveScience. Retrieved 5 December 2017.
^Smith, Andrew T.; et al. (2010-04-23). A Guide to the Mammals of China. p. 308. ISBN978-1400834112.
^Chu, Z.; He, H.; Ramezani, J.; Bowring, S.A.; 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 (10): 3983–3992. doi:10.1002/2016GC006529.
^ abcZhe-Xi Luo; Chong-Xi Yuan; Qing-Jin Meng; Qiang Ji (25 August 2011). (PDF). Nature. 476 (7361): 442–445. doi:10.1038/nature10291. PMID 21866158. S2CID 205225806. Archived from the original (PDF) on 10 November 2013. Electronic supplementary material
^Discovery of a 160-million-year-old fossil represents a new milestone in early mammal evolution
^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:10.1371/journal.pone.0149377. PMC4775064. PMID 26933950.
External links
'Jurassic Mother' Found in China: Discovery News
Paleobiology Database: Juramaia sinensis
January 07, 2023
juramaia, extinct, genus, very, basal, eutherian, mammal, known, from, late, jurassic, oxfordian, stage, deposits, western, liaoning, china, small, shrew, like, mammal, with, body, length, approximately, making, similar, size, modern, winton, shrew, known, fro. Juramaia is an extinct genus of very basal eutherian mammal known from the Late Jurassic Oxfordian stage deposits of western Liaoning China It is a small shrew like mammal with a body length of approximately 70 100 mm 1 2 making it similar in size to the modern De Winton s shrew 3 Juramaia is known from the holotype BMNH PM1343 an articulated and nearly complete skeleton including incomplete skull preserved with full dentition JuramaiaTemporal range Late Jurassic 161 160 Ma PreꞒ Ꞓ O S D C P T J K Pg N RestorationScientific classificationKingdom AnimaliaPhylum ChordataClass MammaliaClade EutheriaGenus JuramaiaLuo et al 2011Species J sinensis Luo et al 2011 type Contents 1 Discovery 2 Evolution 3 Classification 4 See also 5 References 6 External linksDiscovery EditIt was collected in the Daxigou site Jianchang from the Tiaojishan Formation dated at about 160 million years ago 4 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 5 Evolution EditThe 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 5 Furthermore its discovery fills gaps in the fossil record and helps to calibrate modern DNA based methods of dating the evolution 6 7 Based on climbing adaptations found in the forelimb bones it has been suggested that the basal stock of Eutheria was arboreal 5 in a manner resembling that of modern rats 8 Classification EditMetatheria Sinodelphys szalayiCenozoic metatherianEutheria Juramaia sinensisMontanalestes keeblerorumMurtoilestes abramoviEomaia scansoriaProkennalestes trofimoviCenozoic placentaliaSee also EditEomaiaReferences Edit Juramaia sinensis 160 Million Year Old Fossil Pushes Back Mammal Evolution Archived from the original on 2012 03 27 Retrieved 2011 09 09 Welsh Jennifer 24 August 2011 Skinny Shrew Is Oldest True Mammal LiveScience Retrieved 5 December 2017 Smith Andrew T et al 2010 04 23 A Guide to the Mammals of China p 308 ISBN 978 1400834112 Chu Z He H Ramezani J Bowring S A 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 10 3983 3992 doi 10 1002 2016GC006529 a b c Zhe Xi Luo Chong Xi Yuan Qing Jin Meng Qiang Ji 25 August 2011 A Jurassic eutherian mammal and divergence of marsupials and placentals PDF Nature 476 7361 442 445 doi 10 1038 nature10291 PMID 21866158 S2CID 205225806 Archived from the original PDF on 10 November 2013 Electronic supplementary material Fossil redefines mammal history BBC News Discovery of a 160 million year old fossil represents a new milestone in early mammal evolution 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 10 1371 journal pone 0149377 PMC 4775064 PMID 26933950 External links Edit Jurassic Mother Found in China Discovery News Juramaia sinensis 160 Million Year Old Fossil Pushes Back Mammal Evolution Paleobiology Database Juramaia sinensis Retrieved from https en wikipedia org w index php title Juramaia amp oldid 1110520301, wikipedia, wiki, book, books, library,
