Chinese Science Bulletin

, Volume 46, Issue 9, pp 782–785

A new family of primitive mammal from the Mesozoic of western Liaoning, China

  • Jinling Li
  • Yuan Wang
  • Yuanqing Wang
  • Chuankui Li
Notes

Abstract

A fairly well-preserved specimen of a new primitive mammal,Repenomamus robustus gen. et sp. nov., has been described from the Yixian Formation (Lower Cretaceous), western Liaoning, China. This animal has several derived characteristics, such as well-developed dentary/squamosal articulation, reduced number of tooth, differentiation of premolars and molars in postcanine teeth, presence of a dorsal process of the premaxilla that is not in contact with the nasal, closed medial wall of the orbit, and presence of fingerlike promontorium on the petrosal. It also retains some primitive reptile-like features. It is the most primitive taxon among the three mammals known from the Jehol Biota, and also represents the largest mammal of Mesozoic age over the world.

Keywords

primitive mammal Early Cretaceous western Liaoning 

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References

  1. 1.
    Hou, L. H., Zhou, Z. H., Paleornithology of China: A general review, Chinese Science Bulletin, 1999, 44(23): 2113.CrossRefGoogle Scholar
  2. 2.
    Chen, P. J., Dong, Z. M., Zhen, S. N., An exceptionally well-preserved theropod dinosaur from the Yixian Formation of China, Nature, 1998, 391: 147.CrossRefGoogle Scholar
  3. 3.
    Ji, Q., Currie, P. J., Norell, M. A. et al., Two feathered dinosaurs from northeastern China, Nature, 1998, 393: 753.CrossRefGoogle Scholar
  4. 4.
    Xu, X., Wang, X. L., Wu, X. C., A “downy” dromaeosaur from the Yixian Formation, northeastern China, Nature, 1999, 401: 262.CrossRefGoogle Scholar
  5. 5.
    Wang, Y., Gao, K. Q., Earliest Asian discoglossid frog from western Liaoning, Chinese Science Bulletin, 1999, 44(7): 636.CrossRefGoogle Scholar
  6. 6.
    Wang, Y., A new salamander (Amphibia: Caudata) from the Early Cretaceous Jehol Biota, Vertabrata PalAsiatica, 2000, 38(2): 100.Google Scholar
  7. 7.
    Hu, Y. M., Wang, Y. Q., Luo, Z. X. et al., A new symmetrodont mammal from China and its implications for mammalian evolution, Nature, 1997, 390: 137.CrossRefGoogle Scholar
  8. 8.
    Ji, Q., Luo, Z. X., Ji, S. A., A Chinese triconodont mammals and mosaic evolution of the mammalian skeleton, Nature, 1999, 398: 326.CrossRefGoogle Scholar
  9. 9.
    Gao, K. Q., Tang, Z. L., Wang, X. L., A long-necked diapsid reptile from the Upper Jurassic/Lower Cretaceous of Liaoning Province, northeastern China, Vertebrata PalAsiatica, 1999, 37(1): 1.Google Scholar
  10. 10.
    Wang, X. L., Wang, Y. Q., Wang, Y. et al., Stratigraphic sequence and vertebrate-bearing beds of the lower part of the Yixian Formation in Sihetun and neighboring area, western Liaoning, China, Vertebrata PalAsiatica, 1998, 36(2): 81.Google Scholar
  11. 11.
    Swisher, C. C., Wang, Y. Q., Wang, X. L. et al., Cretaceous age for the feathered dinosaurs of Liaoning, China, Nature, 1999, 400: 58.CrossRefGoogle Scholar
  12. 12.
    Crompton, A. W., Luo, Z. X., Relationships of the Liassic mammalsSinoconodon, Morganucodon oehleri, andDinnetherium, Mammal Phylogeny—Mesozoic Differentiation, Multituberculates, Monotremes, Early Therians, and Marsupials (eds. Szalay, F. S., Novacek, M. J., McKenna, M. C.), New York: Springer-Verlag, 1993, 30–44.Google Scholar
  13. 13.
    Crompton, A. W., Sun, A. L., Cranial structure and relationships of the Liassic mammalSinoconodon, Zoological Journal of the Linnean Society, 1985, 85: 99.CrossRefGoogle Scholar
  14. 14.
    Wang, Y. Q., Hu, Y. M., Li, C. K., Mesozoic mammals of China and their implications for mammal evolution (ed. Department of Geology, Peking University), Collected Works of International Symposium on Geological Science Held at Peking University (in Chinese), Beijing: Seismological Press, 1998, 360–372.Google Scholar
  15. 15.
    Kermack, K. A., Mussett, F., Rigney, H. W., The skull ofMorganucodon, Zoological Journal of Linnean Society, 1981, 71: 1.CrossRefGoogle Scholar
  16. 16.
    Jenkins, Jr. F. A., Crompton, A. W., Triconodonta, Mesozoic Mammals—The First Two-thirds of Mammalian History (eds. Lillegraven, J. A., Kielan-Jaworowska, Z., Clemens, W. A.), Berkeley: University of California Press, 1979, 74–90.Google Scholar
  17. 17.
    Jenkins, Jr. F. A., Schaff, C. R., The Early Cretaceous mammalGobiconodon (Mammalia, Triconodonta) from the Cloverly Formation in Montana, Journal of Vertebrate Paleontology, 1988, 8(1): 1.Google Scholar
  18. 18.
    Kron, D. G., Docodonta, Mesozoic Mammals—The First Two-thirds of Mammalian History (eds. Lillegraven, J. A., Kielan-Jaworowska, Z., Clemens, W. A.), Berkeley: University of California Press, 1979, 91–98.Google Scholar
  19. 19.
    Kermack, K. A., Lee, J. A., Lees, P. M. et al., A new docodont from the Forest Marble, Zoological Journal of the Linnean Society, 1987, 89(1): 1.CrossRefGoogle Scholar
  20. 20.
    Clemens, W. A., Kielan-Jaworowska, Z., Multituberculata, Mesozoic Mammals—The First Two-thirds of Mammalian History (eds. Lillegraven, J. A., Kielan-Jaworowska, Z., Clemens, W. A.), Berkeley: University of California Press, 1979, 99–149.Google Scholar
  21. 21.
    Jenkins, Jr. F. A., Crompton, A. W., Downs, W. R., Mesozoic mammals from Arizona: new evidence on mammalian evolution, Science, 1983, 222: 1233.CrossRefGoogle Scholar
  22. 22.
    Cassiliano, M. L., Clemens, W. A., Symmetrodonta (eds. Lillegraven, J. A., Kielan-Jaworowska, Z., Clemens, W. A.), Mesozoic Mammals—The First Two-thirds of Mammalian History, Berkeley: University of California Press, 1979, 150–161.Google Scholar
  23. 23.
    Rowe, T., Definition, diagnosis, and origin of Mammalia, Journal of Vertebrate Paleontology, 1988, 8(3): 241.Google Scholar
  24. 24.
    McKenna, M. C., Bell, S. K., Classification of Mammals: Above the Species Level, New York: Columbia University Press, 1997, 1–631.Google Scholar
  25. 25.
    Wible, J. R., Origin of Mammalia: The craniodental evidence reexamined, Journal of Vertebrate Paleontology, 1991, 11(1): 1.Google Scholar
  26. 26.
    Clemens, W. A., Lillegraven, J. A., Lindsay, E. H. et al., Where, when, and what—A survey of known Mesozoic mammal distribution (eds. Lillegraven, J. A., Kielan-Jaworowska, Z., Clemens, W. A.), Mesozoic Mammals—The First Two-thirds of Mammalian History, Berkeley: University of California Press, 1979, 7–58.Google Scholar
  27. 27.
    Carroll, R. L., Vertebrate Paleontology and Evolution, New York: W. H. Freeman and Company, 1988, 1–698.Google Scholar
  28. 28.
    Martinez, R. N., Forster, C. A., The skull ofProbelesodon sanjuanensis, sp. nov., from the Late Triassic Ischigualasto Formation of Argentina, Journal of Vertebrate Paleontology, 1996, 16(2): 285.Google Scholar

Copyright information

© Science in China Press 2001

Authors and Affiliations

  • Jinling Li
    • 1
  • Yuan Wang
    • 1
  • Yuanqing Wang
    • 1
  • Chuankui Li
    • 1
  1. 1.Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijingChina

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