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Transformation and diversification in early mammal evolution.

Zhe-Xi Luo1

  • 1Carnegie Museum of Natural History, Pittsburgh, Pennsylvania 15213, USA. luoz@carnegiemnh.org

Nature
|December 14, 2007
PubMed
Summary

Mesozoic mammal evolution featured rapid diversification and independent experiments. Key traits like middle ear and teeth evolved variably, challenging orderly acquisition theories.

Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Mammalian Evolution

Background:

  • Mesozoic mammals underwent significant diversification and lineage-splitting.
  • Classic evolutionary models proposed an orderly acquisition of key innovations for adaptive radiation.

Observation:

  • Newly discovered fossils reveal that crucial mammalian traits, such as the middle ear and tribosphenic teeth, evolved with high lability in Mesozoic mammals.
  • Evolutionary pathways were not strictly linear, with many independent experiments and ecological specializations occurring.

Findings:

  • The evolution of key mammalian characters was more dynamic and less predictable than previously assumed.
  • Mesozoic mammal diversification led to numerous lineages exploring various evolutionary pathways, including convergent specializations.

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Implications:

  • Revises understanding of mammalian evolutionary history and the tempo of key trait acquisition.
  • Highlights the role of developmental homoplasies and convergent evolution in early mammalian diversification.