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Modern Crinoids

page 11

 

 

The exhibit aquarium shows modern marine invertebrates who’s relatives lived in Iowa’s Mississippian period, 350 million years ago.

  • Chambered Nautilus

  • Sea Urchin (Spikes)

  • Marine Worm

  • Feather Star (crinoid)

 

From modern crinoids we observe that:

  • Crinoids eat plankton and live in areas where of plankton live.

  • Crinoids grow many arms in warm water, few arms in cool water.

  • Crinoids may be stationary or free moving.

  • Crinoids may live in concentrations on the ocean floor or as floating mats.

  • Crinoids are colorful and Crinoids may regenerate lost parts.

 

 

Crinoids of the Mississippian period: Kinderhook Series, Hampton Formation, Le Grand 

Taxocrinus Intermedius

Rhodocrinus Kirbyi  Platycrinus Symmetricus

Dichocrinus

 

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