BIO 385 Invertebrate Zoology
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Invertebrate Diversity
Phylum Nemertea

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Phylum Nemertea Ribbon Worms


  • Body usually very long, flattened
  • Unsegmented
  • Complete gut (separate mouth and anus)
  • Closed circulatory system
  • Retractable proboscis posterior to gut; housed in cavity: rhynchocoel (coelom)
  • Mostly marine, a few in fresh water
Slime Worm
Slime Worm, Oerstedia dorsalis; La Jolla, CA
Preserved Ribbonworm
Milky Ribbonworm, Cerebratulus lacteus, preserved specimen. Color varies with age and sex
Nemertean C.S.
Unidentified Nemertean cross sections
See also labeled photo.
This page last updated 16 March 2013 by Udo M. Savalli ()
Images and text Udo M. Savalli. All rights reserved.