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Extant Ordovician first appearances

  • LiverwortA thallose liverwort named Lunularia cruciata spreads across damp soil in a ribbon-like form. Most species measure less than 10 centimeters wide and remain…
  • Brittle starThe first known brittle stars date from the Early Ordovician period. These ancient creatures diverged from other echinoderms during that time.