| | Amoeba proteus eating a Paramecium
[Animation by Akira Kihara, Protist Information Server]
Chapter Outline- Description of Eukaryotes
- Classification of Eukaryotes
- Amoebae
- Flagellates
- Alveolata
- Algae
- stramenopiles
- Fungi/Metazoa Group
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The term "amoebae" is not an official taxon. This page simply brings together those eukaryotes that move and/or eat by means of "pseudopods," or "false feet."Links:
"Amitochondriate amoebas with intranuclear spindle." [Patterson] Organisms in this group are parasitic, form cysts and lack mitochondria. It is suspected that they had mitochondria at one time but lost them through evolution. Mitosis in this group is done with a spindle contained entirely within the nucleus.
"Usually said to be branching/anastomosing dynamic filamentous pseudopodial system..." [Patterson] Most organisms in this group are foraminifera.
"Tubulocristae protists with strontium sulphate skeleton with symmetry based on 20 radial elements." [Patterson] This is one of several groups of "radiolaria".
| POLYCYSTINEA (Radiolaria) |
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"Tubulocristae eukaryotes, with capsule and fusules separating endoplasm and ectoplasm." [Patterson] This is a group of radiolaria found in marine environments.
"Platycristate heliozoa with multilamellate microtubule organizing center faced with hemispherical structures giving rise to axonemes of microtubules arranged in hexagons and triangles." [Patterson]
"Tubulocristae protists, during spore development endogenous budding accompanies cell division." [Patterson]
| HETEROLOBOSEA (Amoeboflagellates) |
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"To be resolved but either discicristate protists forming eruptive pseudopodia or discicristate protists with parallel basal bodies inserting on an electron-dense pad, possibly with a substantial cross-striated root." [Patterson]
Part of the Ramicristates in some classification schemes, "Acanthamoeba are microscopic ameba commonly found in the environment. Several species of Acanthamoeba have been found to infect humans, A. culbertsoni, A. polyphaga, A. castellanii, A. healyi, (A. astronyxis), A. hatchetti, A. rhysodes, and possibly others. Acanthamoeba spp. are found worldwide. Most commonly, Acanthamoeba are found in the soil and dust, in fresh water sources such as lakes, rivers, and hot springs and in hot tubs. Acanthamoeba may also be found in brackish water and in sea water. Amebas can also be found in Heating, Venting, and Air Conditioner units (HVAC), humidifiers, dialysis units, and contact lens paraphernalia." [CDC] They are mitochondriate eukaryotes with branched tubular mitochondrial cristae. [Patterson] - Acanthamoeba polyphaga (video)
- Acanthamoeba polyphaga (video)
- Acanthamoeba polyphaga (video)
Part of the Ramicristates in some classification schemes, this group contains many amoebae, including the genus Amoeba, that have lobose pseudopodia. They are mitochondriate eukaryotes with branched tubular mitochondrial cristae. [Patterson] - Amoeba proteus (video)
- Hartmannella veriformis (video)
Part of the Ramicristates in some classification schemes, these are the slime molds. They are mitochondriate eukaryotes with branched tubular mitochondrial cristae. [Patterson]
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