Protists

Protista has been broken down into separate kingdoms.
Main distinguishing features are presence of flagella and mitochondrial presence/morphology.
However taxonomy is fluid and future revisions are likely as more discoveries are made.

Amoebozoa
- Have mitochondria with branching tubular cristae.
- Mostly without filaments or microtubule-supported structures outside cell membrane.
- Exceptions found in Archamoebae, which do not have mitochondria and have flagella.

Excavata
- Most have two or more flagella.
- Do not have "classical" mitochondria but retain a mitochondrial organelle in greatly modified form.

Rhizaria
- Most have mitochondria with tubular cristae.
- Most have filamentous structures outside the cell membrane (filose-filamentous, reticulose-networked).
- Most have shells that can fossilize.

Chromalveolata
- Likely to be polyphyletic (last common ancestor not in the group).
- Most are autotrophs (photosynthetic).
- Perhaps is a temporary catch-all group?

Physarum polycephalum, the maze-solving slime mold, is in Amoebozoa.

Naegleria fowleri, the recently famous brain eating amoeba is not a true amoeba but is an excavate.

Trypansoma (sleeping sickness, Chaga's disease) are also excavates.

Syringammina fragilissima, the largest known unicellular organism, is a rhizarian.

Dinoflagellates (red tide) are chromalveolates.

Plasmodium (including malaria parasites) also fall under chromalveolates (perhaps by default, as it does not belong to the other kingdoms?).