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Hexameroceras and Friends
by =avancna

Various Silurian nautiloid-like cephalopods, including:

  • Trimeroceras bulbosum,
  • Mandaloceras bohemicum,
  • Octamerella calistomoides,
  • Ovoceras oviforme,
  • Hexameroceras hertzeri,
  • Conradoceras bohemicum,
  • Pentameroceras mirum

A significant evolutionary milestone during the Silurian was the appearance of jawed and bony fish. Life also began to appear on land in the form of small, moss-like, vascular plants which grew beside lakes, streams, and coastlines.

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