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"Phaeodaria" from Ernst Haeckel's Kunstformen der Natur, 1904
Scientific classification
Domain: Eukaryota
(unranked) Rhizaria
Phylum: Cercozoa
Class: Phaeodarea
Haeckel, 1879

The Phaeodarea are a group of amoeboid protists. They are traditionally considered radiolarians, but in molecular trees do not appear to be close relatives of the other groups, and are instead placed among the Cercozoa. They are distinguished by the structure of their central capsule and by the presence of a phaeodium, an aggregate of waste particles within the cell.

Phaeodarea produce hollow skeletons composed of amorphous silica and organic material, which rarely fossilize. The endoplasm is divided by a cape with three openings, of which one gives rise to feeding pseudopods, and the others let through bundles of microtubules that support the axopods. Unlike true radiolarians, there are no cross-bridges between them. They also lack symbiotic algae, generally living below the photic zone, and do not produce any strontium sulphate.


  • Nikolaev, Sergey I.; Cédric Berney, José F. Fahrni, Ignacio Bolivar, Stephane Polet, Alexander P. Mylnikov, Vladimir V. Aleshin, Nikolai B. Petrov, and Jan Pawlowski (2004). "The twilight of the Heliozoa and rise of the Rhizaria, an emerging supergroup of amoeboid eukaryotes". Proceedings of the National Academy of Sciences 101 (21): 8066-8071. ISSN 0027-8424. Retrieved on 2007-06-08.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Phaeodarea". A list of authors is available in Wikipedia.
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