evlotion of Graptolite

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picuter of one

1 of 4

STIPE ATTITUDE

  • pendant (ordovician)
  • horizontal
  • reclined
  • scandent
  • uni-serial (silurian)
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THECAL SHAPE

  • simple (ordovician)
  • hooked
  • lobate
  • isolate (silurian)
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STIPE NUMBER

  • quadroserial (ordovician)
  • biserial
  • uniserial (silurian)
4 of 4

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