Fauna Marin GmbH All for Reef Tropic Marin Tropic Marin Professionell Lab Fauna Marin GmbH

Eurythoe complanata Fire worm

Eurythoe complanatais commonly referred to as Fire worm. Difficulty in the aquarium: Not suitable for home aquaria!. Toxicity: Has a poison harmful to health.

Profilbild Urheber Dr. Paddy Ryan, USA

Copyright Dr. Paddy Ryan

Courtesy of the author Dr. Paddy Ryan, USA . Please visit for more information.

Uploaded by AndiV.

Image detail


Eurythoe complanata 
Fire Worm 
Sea Worms 
Family tree:
Animalia (Kingdom) > Annelida (Phylum) > Polychaeta (Class) > Amphinomida (Order) > Amphinomidae (Family) > Eurythoe (Genus) > complanata (Species) 
Initial determination:
(Pallas, ), 1766 
El Salvador, American Samoa, Australia, Azores, Bermuda, Brazil, Chile, China, Columbia, Costa Rica, Cuba, Easter Island (Rapa Nui), Ecuador, European Coasts, Florida, French Polynesia, Galapagos Islands, Guam, Gulf of California, Gulf of Mexico, Hawaii, India, Indian Ocean, Indo Pacific, Indonesia, Jamaica, Japan, Kiribati, Madagascar, Marschall Islands, Mexico (East Pacific), Micronesia, Mozambique, North Pacific (Ocean), Northern Mariana Islands, Okinawa, Panama, Peru, Philippines, Puerto Rico, Red Sea, Samoa, Singapore, South America, Sumatra, the Caribbean, the Cocos Islands / Keeling Islands, the Mediterranean Sea, the Netherlands Antilles, Tuamoto Islands, USA 
Sea depth:
1 - 1100 Meter 
2.36" - 3.94" (6cm - 10cm) 
°F - 82.4 °F (°C - 28°C) 
Worms, Zoobenthos 
Not suitable for home aquaria! 
Not available as offspring 
Has a poison harmful to health 
Not evaluated 
Red List:
Not evaluated (NE) 
Related species at
Catalog of Life:
  • Eurythoe brasiliensis
  • Eurythoe clavata
  • Eurythoe dubia
  • Eurythoe encopochaeta
  • Eurythoe hedenborgi
  • Eurythoe indica
  • Eurythoe karachiensis
  • Eurythoe laevisetis
  • Eurythoe longicirra
More related species
in this lexicon:
Last edit:
2014-03-08 18:25:35 


This is a general hint!
Eurythoe complanata has a harmful toxin.
As a rule, animals with a harmful poison do not pose any danger in normal Aquarieaner everyday life. Read the following husbandry information and comments from aquarists who already keep Eurythoe complanata in their aquarium to get a better picture about the possible danger. However, please be careful when using Eurythoe complanata. Every human reacts differently to poisons.
If you suspect that you have come into contact with the poison, please contact your doctor or the poison emergency call.
The phone number of the poison emergency call can be found here:
Overview Worldwide:


Eurythoe complanata(Pallas, 1766)

Leslie Harries (comment to the last photo - user "Meerwasser") :"Your worms are amphinomidae. I have never received specimens of this type from aquarists for examination although it is the most common species found in reef tanks. They may be juveniles of Eurythoe complanata, another Eurythoe species, or belong to a different genus. They are not Hermodice or Pherecardia which are voracious predators on corals, crabs, worms, etc., as well as scavengers and which should be removed immediately. Eurythoe are primarily detritus feeders, herbivores, and scavengers. They will not eat healthy coral as far as I know but as scavengers they are attracted to diseased and rotting flesh so they will eat sick, wounded, or dying coral. As a result they are often blamed for coral mortality when they are only scavenging. Much less is known about feeding in the other amphinomid genera. The small ones you have are primarily detritus & algae eaters based on what we know from reef tanks; I'm willing to bet that they are scavengers as well. As you've probably read, their numbers will go up if you overfeed a tank & decrease when the food supply goes down.

They should not hurt your corals. I say should not instead of won't because invertebrates don't read our reference books and don't know how they are supposed to act. There is always a possibility that if they are starving they will start eating things they don't normally eat . However, if they have been in your algae refuge for a while and your corals are healthy then they have proved themselves harmless under normal conditions."

Amphinome jamaicensis Schmarda, 1861
Amphinome macrotricha Schmarda, 1861
Aphrodita complanata Pallas, 1766
Blenda armata Kinberg, 1867
Eurythoe albosetosa Kinberg, 1857
Eurythoe alcyonaria Gravier, 1902
Eurythoe assimilis McIntosh, 1925
Eurythoe capensis Kinberg, 1857
Eurythoe corallina Kinberg, 1857
Eurythoe ehlersi Kinberg, 1867
Eurythoe havaica Kinberg, 1867
Eurythoe indica Kinberg, 1867
Eurythoe kamehameha Kinberg, 1857
Eurythoe pacifica Kinberg, 1857
Eurythoe pacifica levukaensis McIntosh, 1885
Lycaretus neocephalicus Kinberg, 1867
Pleione alcyonea Savigny in Lamarck, 1818

Classification: Biota > Animalia (Kingdom) > Annelida (Phylum) > Polychaeta (Class) > Errantia (Subclass) > Amphinomida (Order) > Amphinomidae (Family) > Eurythoe (Genus)

External links

  1. Homepage Anne Frijsinger & Mat Vestjens (en). Abgerufen am 19.08.2020.
  2. Virtual Zoo (en). Abgerufen am 19.08.2020.
  3. World Register of Marine Species (WoRMS) (en). Abgerufen am 19.08.2020.



Copyright Dr. Paddy Ryan
© Anne Frijsinger & Mat Vestjens

Husbandry know-how of owners

am 23.06.21#1
Toll, daß es diese Seite mitsamt den Warnhinweisen gibt - als ich die beschriebenen Würmer in meinem Tank entdeckte, dachte ich nämlich nur: "Och! Wie hübsch!" LOL
Die Länge von 10cm kann ich bestätigen. Bei mir leben sie sehr versteckt und trauen sich nur gelegentlich mal heraus. Von ihrem Habitus her erinnern sie Seehasen: Sehr bedächtig, gemütlich und nur schnell, wenn sie irgendwo gegenstoßen und sich erschrecken. Mich beschleicht das Gefühl, daß sie nicht rein carnivor sind... bei dem Tempo laufen denen ja selbst Blumentiere davon... ;-)
1 husbandary tips from our users available
Show all and discuss