Era: Paleozoic
  Period: Devonian
   Epoch: Early
    Age: Pragian

Pteraspis contre-jour

Two jawless fish of the genus Pteraspis feed near the ocean's surface 410 million years ago during the Early Devonian. Pteraspis grew to a length of about 8 inches and is believed to have dined on shoals of plankton. A hard shell and spikes may have helped to protect Pteraspis from larger predators.