See text Rhizamoeba is a small genus of free-living marine naked lobose amoebae in the monotypic family Rhizamoebidae[1] in the order Leptomyxida.

[1] Members of Rhizamoeba are characterized by their morphology when they move, which is usually monopodial (with a single ramification), alternating between a slug-like shape and a fan shape.

[1] The paraphyly of the genus caused the transfer of two previously rhizamoeban species into Leptomyxa: R. australiensis and R. neglecta.

As a result, only 3 species are currently confirmed as Rhizamoeba:[1] Other possible species are not yet confirmed due to lack of published data or poor documentation.

[1] Some of these are: R. schnepfii Kühn 1996/97 (considered nomen dubium since it has not been deposited to any culture collection), Trichamoeba caerulea Schaeffer 1926 and Trichamoeba clava Schaeffer 1926 (both transferred to Rhizamoeba in 1980[4] but poorly documented), Amoeba clavarioides Penard 1902 (identified as R. clavarioides through light microscopy[5]), Polychaos timidum Bovee 1972 (identified as R. timidum through light microscopy[6]), etc.