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A Chinese triconodont mammal and mosaic evolution of the mammalian skeleton

Author

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  • Ji Qiang

    (National Geological Museum of China
    China University of Geosciences)

  • Luo Zhexi

    (Section of Vertebrate Paleontology, Carnegie Museum of Natural History)

  • Ji Shu-an

    (National Geological Museum of China)

Abstract

Here we describe a new triconodont mammal from the Late Jurassic/Early Cretaceous period of Liaoning, China. This new mammal is represented by the best-preserved skeleton known so far for triconodonts which form one of the earliest Mesozoic mammalian groups with high diversity. The postcranial skeleton of this new triconodont shows a mosaic of characters, including a primitive pelvic girdle and hindlimb but a very derived pectoral girdle that is closely comparable to those of derived therians. Given the basal position of this taxon in mammalian phylogeny, its derived pectoral girdle indicates that homoplasies (similarities resulting from independent evolution among unrelated lineages) are as common in the postcranial skeleton as they are in the skull and dentition in the evolution of Mesozoic mammals. Limb structures of the new triconodont indicate that it was probably a ground-dwelling animal.

Suggested Citation

  • Ji Qiang & Luo Zhexi & Ji Shu-an, 1999. "A Chinese triconodont mammal and mosaic evolution of the mammalian skeleton," Nature, Nature, vol. 398(6725), pages 326-330, March.
    • Handle: RePEc:nat:nature:v:398:y:1999:i:6725:d:10.1038_18665
    DOI: 10.1038/18665
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