After Domning, 1988, 1989a, b, 1990, 1996, 1997

<==o Dugongidae Gray, 1821 [Halicoridae] (seacows, dudongs; merilehmät)
   |?- †“Halitherium” bellunense de Zigno, 1875
   |?- †Anisotherium pannonica Kordos, 1979
   |?-o †Indosiren von Koenigswald, 1952 [=? von Königswald]
   |  |-- †I. javanensis von Koenigswald, 1952
   |  `-- †I. koenigswaldi Sahni & Mishra, 1975
   |?- †Miodudong brevicranius Deraniyagala, 1969
   |?- †Paralitherium tarkanyense Kordos, 1977
   |?- †Prohalicore dubaleni Flot, 1887
   |?- †Sirenavus hungaricus Kretzoi, 1941
   |--o †Eotheroides Trouessart, 1905
   |  |-- †E. aegyptiacum (Owen, 1875)
   |  `-- †“Eotherium” majus (Zdansky, 1938)
   `--o †Halitheriinae Carus, 1868 sensu Abel, 1913 [paraphyletic]
      |?- †“Prototherium” intermedium Bizzotto, 1983
      |?- †Prototherium veronense (de Zigno, 1875) de Zigno, 1887
      |?- †“Eosiren” stromeri (Sickenberg, 1934) Kordos, 1977
      |?- †“Eosiren” abeli Sickenberg, 1934
      |-- †Eosiren libyca Andrews, 1902
      `--+-- †“Eosiren” imenti
         |?- †“Halitherium” alleni Simpson, 1932
         |?- ?†“Halitherium” antillense Matthew, 1916
         `--+-- †“Halitherium” schinzii (Kaup, 1838) Kaup, 1855
            `--+-- †Halitherium christolii Fitzinger, 1842
               `--+--o Dugonginae (Gray, 1821) Simpson, 1932 [incl. Rytiodontinae Abel, 1914] (seacows; merilehmät)
                  |  |?- †Bharatisiren kachchhensis (Bajpai, Singh & Singh, 1987) Bajpai & Domning, 1997
                  |  |?- ?†Caribosiren turneri Reinhard, 1959
                  |  |?- †Domningia sodhae [non Domningia (Campanulaceae), a family of flowering plants]
                  |  |?- †Thalattosiren petersi (Abel, 1904) Sickenburg, 1928
                  |  |?- †Kutchisiren cylindrica Bajpai, Domning, Das, Vélez-Juarbe & Mishra, 2010; E.Mioc. Ind.
                  |  |-- †Crenatosiren olseni (Reinhard, 1976) Domning, 1991 [“Halitherium” olseni Reinhard, 1976]
                  |  `--+--o Dugong dugon (Müller, 1776) Palmer, 1895 (merilehmä; dudong, seacow) [Dudong Lacépède, 1799 (nomen nudum)]
                  |     |  |-- D. d. dugon (intiandugongi; Indian dudong)
                  |     |  |-- D. d. australis (australiandugongi; Australian dudong)
                  |     |  `-- D. d. hemprichii (punaisenmerendugongi; Red Sea dudong)
                  |     `--+-- †Bharatisiren kachchhense (Bajpai, Singh & Singh, 1987) Bajpai & Domning, 1997 [Metaxytherium kachchhensis Bajpai, Singh & Singh, 1987; Metaxytherium kachchhense (Bajpai, Singh & Singh, 1987) emend. Domning, 1996]
                  |        `--+--+-- †Rytiodus capgrandi Lartet, 1866
                  |           |  |-- †Rytiodus sp.
                  |           |  `-- †Corystosiren varguezi Domning, 1990
                  |           `--+-- †Dioplotherium manigaulti Cope, 1883
                  |              `--+-- †“Dioplotherium” allisoni (Kilmer, 1965) Domning, 1978
                  |                 `-- †Xenosiren yucateca Domning, 1989
                  `--o †“Metaxytheriinae” [paraphyletic]
                     |?- †“Metaxytherium” aquitaniae Piller, 1987
                     |?- †“Metaxytherium” arctodites Aranda-Manteca, Domning & Barnes, 1994
                     |?- †Metaxytherium beaumontii de Christol, in de Blainviile, 1844 [nomen dubium]
                     |?- †“Metaxytherium” crataegense (Simpson, 1932) Aranda-Manteca, Domning & Barnes, 1994
                     |?- †“Metaxytherium” lovisati Capellini, 1886 [=? M. medium]
                     |?- †“Metaxytherium” meyeri Abel, 1904 [nomen dubium]
                     |?- †“Metaxytherium” serresii (Gervais, 1847) Depéret, 1895
                     |?- †“Metaxytherium” subapennium (Bruno, 1839) Fondi & Pacini, 1974
                     `--+--+-- †“Metaxytherium” krahuletzi Depéret, 1895
                        |  `-- †“Metaxytherium” medium (Demarest, 1822) Hooijer, 1952
                        `--+-- †“Metaxytherium” floridanum Hay, 1922 [Felsinotherium ossivallense Simpson, 1932; Metaxytherium ossivallense (Simpson, 1932)]
                           `--+-- †“Metaxytherium” calvertense Kellogg, 1966
                              `--o †Hydrodamalinae (Palmer, 1895) sensu Simpson, 1932 (North Pacific seacows; sellerinmerilehmät)
                                 |?- †Dusisiren reinhardi Domning, 1978
                                 |?- †“Dusisiren” jordani (Kellogg, 1925) Domning, 1978
                                 |?-+-- †“Dusisiren” dawana Takahashi, Domning & Saito, 1986
                                 |  `-- †“Dusisiren” takasatensis Kobayashi, Horikawa & Miyazaki, 1995
                                 `--o †Hydrodamalis Retzius, 1794 (sellerinmerilehmät)
                                    |-- †H. cuestae Domning, 1978
                                    |-- †H. spissa
                                    `-- †H. gigas (Zimmermann, 1780) Palmer, 1895 (Steller's seacow; stellerinmerilehmä) [exterminated by humans circa A.D. 1768]

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