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  1. Middle Proterozoic (1.5 Ga) Horodyskia moniliformis Yochelson and Fedonkin, the oldest known tissue-grade colonial eucaryote
    Publication info: Washington, D.C, Smithsonian Institution Press, 2002
  2. Smithsonian contributions to paleobiology
    Publication info: Washington, Smithsonian Institution Press, 1969-