Class Lobosea (Carpenter, 1861) Cavalier-Smith, 1993 see Subphylum Lobosa Carpenter, 1861
   Subclass Gymnamoebia (Haeckel, 1862) Cavalier-Smith, 1993 see [unranked] Gymnamoebae
     Order Leptomyxida Pussard & Pons, 1976
       Suborder Leptoramosina Page, 1987 see Order Leptomyxida Pussard & Pons, 1976
         Family Stereomyxidae Grell, 1966
           Genus Stereomyxa Grell, 1966