Myxozoans: Ancient metazoan parasites find a home in phylum Cnidaria

Stephen D. Atkinson, Jerri L. Bartholomew, Tamar Lotan

Research output: Contribution to journalArticlepeer-review


Myxozoans are endoparasites with complex life cycles that alternate between invertebrate and vertebrate hosts. Though considered protozoans for over 150 years, they are now recognized as metazoans, given their multicellularity and ultrastructural features. In recognition of synapomorphies and cnidarian-specific genes, myxozoans were placed recently within the phylum Cnidaria. Although they have lost genetic and structural complexity on the path to parasitism, myxozoans have retained characteristic cnidarian cnidocysts, but use them for initiating host infection. Myxozoans represent at least 20% of phylum Cnidaria, but as a result of rapid evolution, extensive diversification and host specialization, they are probably at least as diverse as their free-living relatives. The ability of myxozoans to infect freshwater, marine and terrestrial hosts implies that Cnidaria are no longer constrained to the aquatic environment.

Original languageEnglish
Pages (from-to)66-68
Number of pages3
StatePublished - Aug 2018

Bibliographical note

Publisher Copyright:
© 2018 Elsevier GmbH


  • Cnidaria
  • Myxozoa
  • cnidocyst
  • parasite

ASJC Scopus subject areas

  • Animal Science and Zoology


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