Class Tubulinea Smirnov et al., 2005 (=Lobosea Cavalier-Smith, 2004)
Diagnosis: Organisms producing lobose pseudopodia. The entire cell or individual pseudopodia (in polypodial cells) are tubular, cylindrical or sub-cylindrical, rounded in cross-section. If cells are flattened or branched they are capable of altering the locomotive form from a flattened, expanded one to monopodial or polypodial, with sub-cylindrical pseudopodia. Mono axial flow of the cytoplasm in every pseudopodium or in the entire cell. No convincing evidence of ciliate stages. Two groups are testate, and two sorocarpic taxa are known. No sporocarpy has been reported.