Phalansterium is a genus of single-celled flagellated organisms comprising several species, which form colonies. It is the only genus in the family Phalansteriidae. Phalansterium produces tetraspores.
Phalansterium is hard to classify; it has a distinctive ultrastructure of its pericentriolar material. Molecular evidence places it in the Amoebozoa.
It has been suggested that it is similar to the ancestral eukaryote.
Species Genus Phalansterium Cienkowsky 1870 Species Phalansterium arcticum Shmakova, Karpov & Smirnov 2018 Species Phalansterium consociatum (Fresenius 1858) Cienkowsky 1870 Species Phalansterium digitatum Stein 1878 Species Phalansterium filosum Cavalier-Smith & Chao 2011 Species Phalansterium intestinum Cienkowsky 1870 Species Phalansterium solitarium Sandon 1924
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