| Revision as of 16:55, 23 August 2004 editJosh Grosse (talk | contribs)8,857 editsNo edit summary← Previous edit | Revision as of 14:51, 27 August 2004 edit undoJosh Grosse (talk | contribs)8,857 editsNo edit summaryNext edit → | ||
| Line 1: | Line 1: | ||
| The '''Rhizaria''' are a major line of ]s. They vary considerably in form, but for the most part they are ]s with filose, reticulose, or microtubule-supported pseudopods. Many produce shells or skeletons, which may be quite complex in structure; these make up the vast majority of protozoan fossils. The main groups of Rhizaria are the ], ], and ]ns, considered close relatives based on genetic studies; they may be regarded as an extension of the Cercozoa, which are already a heterogenous group defined mainly by genetics. | The '''Rhizaria''' are a major line of ]s. They vary considerably in form, but for the most part they are ]s with filose, reticulose, or microtubule-supported pseudopods. Many produce shells or skeletons, which may be quite complex in structure; these make up the vast majority of protozoan fossils. The main groups of Rhizaria are the ], ], and ]ns, considered close relatives based on genetic studies; they may be regarded as an extension of the Cercozoa, which are already a heterogenous group defined mainly by genetics. | ||
| The name Rhizaria was introduced by ] in 2002 |
The name Rhizaria was introduced by ] in 2002. Originally the ]s and ]s were included, but they do not appear to be close relatives of the other groups. | ||
| == References == | == References == | ||
Revision as of 14:51, 27 August 2004
The Rhizaria are a major line of protists. They vary considerably in form, but for the most part they are amoeboids with filose, reticulose, or microtubule-supported pseudopods. Many produce shells or skeletons, which may be quite complex in structure; these make up the vast majority of protozoan fossils. The main groups of Rhizaria are the Cercozoa, Foraminifera, and radiolarians, considered close relatives based on genetic studies; they may be regarded as an extension of the Cercozoa, which are already a heterogenous group defined mainly by genetics.
The name Rhizaria was introduced by Cavalier-Smith in 2002. Originally the centrohelids and apusomonads were included, but they do not appear to be close relatives of the other groups.
References
- Cavalier-Smith, T. (2002). The phagotrophic origin of eukaryotes and phylogenetic classification of Protozoa. International Journal of Systematic and Evoluionary Microbiology 52: 297-354.
- Sergey I. Nikolaev et al. (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: 8066-8071.