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Revision as of 05:59, 23 August 2004 by Josh Grosse (talk | contribs)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)The Rhizaria include several lines of protists which for the most part have amoeboid forms and often produce shells, some of which are quite intricate. They vary greatly in form, but are considered close relatives based on genetic studies. The main groups included are:
- The Cercozoa, including most protozoa with filose pseudopods;
- The Foraminifera, which produce chambered shells and have reticulose pseudopods;
- The radiolarians, several groups with complex skeletons and microtubule-supported axopods
The name Rhizaria was introduced by Cavalier-Smith as an infrakingdom. Originally it included the centrohelids and apusomonads, but they do not appear to be close relatives of the other groups. Rhizaria generally have mitochondria with tubular cristae, and cells with flagella typically have two. They include the vast majority of fossil protozoa.
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