The Percolozoa are a group of colourless, non-photosynthetic Excavata, including many that can transform between amoeboid, flagellate, and cyst stages.

[1] The only member of this group that is infectious to humans is Naegleria fowleri, the causative agent of the often fatal disease amoebic meningitis.

[3] The presence of a ventral feeding groove in the flagellate stage, as well as other features, suggests that they are part of the Excavata group.

These are superficially similar to the sporangia of the dictyostelids, but the amoebae only aggregate as individuals or in small groups and do not die to form the stalk.

[6][4] Pharyngomonas Selenaion Dactylomonas Neovahlkampfia Euplaesiobystra Heteramoeba Vrihiamoeba Oramoeba Stachyamoeba Fumarolamoeba Parafumarolamoeba Paravahlkampfia Sawyeria Psalteriomonas Pseudoharpagon Pseudomastigamoeba Harpagon Monopylocystis Allovahlkampfia Solumitrus Pocheina Acrasis Marinamoeba Pleurostomum Tulamoeba Naegleria Willaertia Tetramitus Vahlkampfia Creneis Stephanopogon Barbelia Nonamonas Lula Percolomonas Nakurumonas Phylum Percolozoa Cavalier-Smith 1991[8] The Heterolobosea were first defined by Page and Blanton in 1985[9] as a class of amoebae, and so only included those forms with amoeboid stages.