Flabellinia

{{Short description|Subclass of Amoebozoa}}

{{About|the Amoebozoa subclass|sea slug|Flabellina}}

{{Automatic taxobox

| image = Parasite140120-fig3 Acanthamoeba keratitis.png

| image_caption = Acanthamoeba sp.

| taxon = Flabellinia

| authority = Smirnov et al. 2005{{cite journal |vauthors=Smirnov A, Nassonova E, Berney C, Fahrni J, Bolivar I, Pawlowski J |title=Molecular phylogeny and classification of the lobose amoebae |journal=Protist |volume=156 |issue=2 |pages=129–42 |date=August 2005 |pmid=16171181 |doi=10.1016/j.protis.2005.06.002 }}

| subdivision_ranks = Orders

| subdivision =

• Dactylopodida
• Dermamoebida
• Stygamoebida
• Vannellida

}}

The Flabellinia are a subclass of Amoebozoa. During locomotion the cells are flattened and have a clear layer called hyaloplasm along the front margin. Some form slender subpseudopodia projecting outward from the hyaloplasm, but the cell mass does not flow into these as in true pseudopodia, and advances without a definite central axis as in the Tubulinea. They also lack distinctive features like shells and flagella, and are united mainly by evidence from molecular trees.

The group was originally created by Alexey Smirnov and his coauthors as the class Flabellinea, which was similar in composition to the group Discosea, proposed by Cavalier-Smith et al. (2004).{{cite journal |author1=Cavalier-Smith, T. |author2=Chao, E-Y |author3=Oates, B. | title = Molecular phylogeny of the Amoebozoa and evolutionary significance of the unikont Phalansterium

| journal = European Journal of Protistology

| year = 2004 | volume = 40 | pages = 21–48

| doi = 10.1016/j.ejop.2003.10.001}} In 2011, Smirnov accepted Discosea as a class and reduced Flabellinea to the rank of a subclass, with the name Flabellinia.{{Cite journal|last=Smirnov|first=Alexey V.|last2=Chao|first2=Ema|last3=Nassonova|first3=Elena S.|last4=Cavalier-Smith|first4=Thomas|date=2011-10-01|title=A revised classification of naked lobose amoebae (Amoebozoa: lobosa)|journal=Protist|volume=162|issue=4|pages=545–570|doi=10.1016/j.protis.2011.04.004|issn=1618-0941|pmid=21798804}}