Standard Article


  1. Reinhardt Møbjerg Kristensen

Published Online: 30 MAY 2001

DOI: 10.1038/npg.els.0001597



How to Cite

Kristensen, R. M. 2001. Cycliophora. eLS. .

Author Information

  1. Zoological Museum, University of Copenhagen, Denmark

Publication History

  1. Published Online: 30 MAY 2001


The cycliophorans are the recently discovered group of microscopic marine animals with an asexual and sexual life cycle. The only described species Symbion pandora lives on the mouth appendages of marine lobsters and have so far only been found in the Northern hemisphere. The phylogenetic position in the Animal Kingdom is still uncertain. Cycliophorans have been considered a sister group to Entoprocta and Ectoprocta or Rotifera and Acanthocephala.


  • epibiont;
  • crustacean;
  • sessile stage;
  • Pandora larva;
  • dwarf primary male;
  • dwarf secondary male;
  • dwarf female;
  • chordoid larva