Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.
   Class Liliopsida Batsch (1802) see Class Magnoliopsida Brongn. (1843)
     Subclass Alismatidae Takht. (1967) see Order Alismatales R.Br. ex Bercht. & J.Presl (1820)
       Superorder Alismatanae Takht. (1967) see Order Alismatales R.Br. ex Bercht. & J.Presl (1820)
         Order Cymodoceales Nakai (1943) see Order Alismatales R.Br. ex Bercht. & J.Presl (1820)
           Family Cymodoceaceae Vines (1895), nom. cons. - Cymodocea family
             1 Genus Cymodocea K.D.Koenig (1805), nom. cons.
             2 Genus Halodule Endl. (1841)
             3 Genus Syringodium Kuetzing, in Hohenacker (1860)
             4 Genus Amphibolis C.Agardh (1823)
             5 Genus Thalassodendron C. den Hartog (1970)