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List of parasitic organisms

This is a list of organisms that are true parasites upon other organisms. For more information on this topic, see main article: Parasitism. For information on parasitoids, see main article: Parasitoid.



(endo = within; parasites that live inside their hosts)



Parasitic worms

These can be categorized into three groups; cestodes, nematodes and trematodes. Examples include:


Protists (Protozoa)

Fictional endoparasites

  • Black Oil
  • Facehuggers, the parasite laying stage in the lifecycle of xenomorphs
  • The Flood, from the video game Halo
  • Goa'uld, from the TV series Stargate SG-1
  • Las Plagas, from the video game Resident Evil 4.
  • Lavos
  • X Parasites, from the Metroid Fusion video game
  • Killer parasitic worms from Slither.
  • Yeerks
  • Kraata
  • Bone Leechs from Blood 2.
  • Bulbmin from Pikmin 2.
  • G.U.I.L.T. from Trauma Center: Under the Knife.
  • The Wirrn, from the BBC series Doctor Who.


(ecto = outside; parasites that live on but not within their hosts, for example, attached to their skin)




  • Hirudinea (some leeches)


  • Candiru (Vampire fish of Brazil, really a facultative parasite)
  • Lampreys

Fictional ectoparasites

  • Brain slugs from Futurama.
  • Headcrabs from the Half-Life series or similar brainsuckers from X-COM: Apocalypse, though these species can be considered parasitoids rather than parasites.
  • The Flood from Halo. They come in three different forms: Infection Form, Combat Form, and Carrier Form.
  • Krana from the LEGO Bionicle series.
  • Nopal from the Jack Vance story Nopalgarth, also called The Brains of Earth.
  • Puppet Masters from Robert A. Heinlein's 1951 novel The Puppet Masters.
  • Shovel-Creatures, which prey on free thought from The Hitchhiker's Guide to the Galaxy movie.
  • Venom from the Marvel Comics Universe.
  • Metroids from the Metroid series video games
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "List_of_parasitic_organisms". A list of authors is available in Wikipedia.
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