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| subdivision =
* [[Heterolobosea]]
* [[Lunosea]]
* [[Lyromonadea]]
* [[Neovahlkampfea]]
* [[Pharyngomonadea]]
|synonyms =
* Acrasiomycota <small>Whittaker 1969</small>
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Usually, the amoeboid form is taken when food is plentiful, and the flagellate form is used for rapid locomotion. However, not all members are able to assume both forms. The genera ''[[Percolomonas]]'', ''[[Lyromonas]]'', and ''[[Psalteriomonas]]'' are known only as flagellates, while ''[[Vahlkampfia]]'', ''[[Pseudovahlkampfia]]'', and most [[acrasid]]s do not have flagellate stages. As mentioned above, under unfavourable conditions, the acrasids aggregate to form sporangia. These are superficially similar to the sporangia of the [[dictyostelid]]s, but the amoebae only aggregate as individuals or in small groups and do not die to form the stalk.
[[File:2023 Heterolobosean.svg|center|thumb|upright=2|{{center|'''Representation of a heterolobosean'''}}{{ordered list|Eruptive [[Pseudopodia|pseudopod]]|
[[Ectoplasm (cell biology)|Ectoplasm]]|
Endoplasm|
[[Phagosome]] with prey|
[[Mitochondria|Mitochondrion]], creates [[Adenosine triphosphate|ATP]] (energy) for the cell (distoid cristae)|
[[Lysosome]], holds enzymes|
[[Food vacuole|Digestive vacuoles]] with prey|
Smooth [[Endoplasmic reticulum|endoplasmic reticulum]], the transport network for molecules going to specific parts of the cell|
[[Golgi apparatus]], modifies [[protein]]s and sends them out of the cell (reduced)|
[[Nucleolus]]|
[[Nucleus]]|
Rough endoplasmic reticulum|
[[Contractile vacuole]], regulates the quantity of water inside a cell|
Uroid}}]]
==Terminology and classification==
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===Phylogeny===
Based on the cladogram from Tolweb and updated by Pánek and Čepička 2014.<ref>{{cite journal|title=Survey on diversity of marine/saline anaerobic Heterolobosea (Excavata: Discoba) with description of seven new species |journal=International Journal of Systematic and Evolutionary Microbiology |volume=64|issue= Pt 7|pages=2280–2304 |doi=10.1099/ijs.0.063487-0 |date=2014 |pmid=24729392|doi-access=free |last1=Pánek |first1=Tomáš |last2=Ptáčková |first2=Eliška |last3=Čepička |first3=Ivan }}</ref><ref name="CavSmith 2021">{{cite journal|vauthors=Cavalier-Smith T|title=Ciliary transition zone evolution and the root of the eukaryote tree: implications for opisthokont origin and classification of kingdoms Protozoa, Plantae, and Fungi|journal=Protoplasma|doi=10.1007/s00709-021-01665-7|date=December 2021|volume=259|issue=3 |pages=487–593|pmid=34940909 |pmc=9010356}}</ref>
{{clade| style=font-size:90%;line-height:80%
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|label1=Selenaionidae
|1={{Clade
|1=''[[Selenaion]]''
|2=''[[Dactylomonas]]''
}}
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}}
|2={{Clade
|label1=
|1={{Clade
|label1=
|1={{Clade
|label1=Neovahlkampfiidae
| |||
