Description of Leptomyxa: This amoeba is a non-sporulating, flattened plasmodium which advances steadily or with occasional eruptive activity. Plasmodia are reticulate and multilobed or branched and with a tendency to fuse. Cells from around 100 µm to over 1 mm in length, multinucleate with a few to several hundred nuclei depending on the size of the cell. Posterior trailing filaments are common. Forms cysts. Widespread in soil and reported in freshwater. Type species: L. reticulata Goodey, 1914.