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O

Oligocene ( 87 )
x  1884Gaudry, A. (Halitherium Chouqueti, n.sp.; Paris Basin, France; 372-375.)
x  1886bHartlaub, C. (Manatherium delheidi, n.gen.n.sp.; Belgium; 369-370.)
x  1889Lefèvre, T. (fossil sirs.; Belgium; 197-200.)
x  1892Lydekker, R. (Prorastoma veronense; [actually Eoc.] Italy; 77-78.)
x  1914Rabell Cabrero, N. (indeterminate sir.; Puerto Rico; 66-69.)
xD 1917Kermode, F. ("Desmostylus" [actually Cornwallius]; Vancouver Is., British Columbia; 42-43.)
xD 1922Cornwall, I.E. ("Desmostylus" [actually Cornwallius]; British Columbia; 121-123.)
xD 1922Hannibal, H. (Desmostylus; California & Oregon; 238-240.)
x  1922aHay, O.P. (Metaxytherium floridanum, n.sp.; [actually Mioc.] Florida; 3.)
x  1925Abel, O. (Halitherium Uytterhoeveni, n.sp.; Belgium; 39.)
x  1932Müllerried, F.K.G. (indeterminate sir.; [actually Eoc.?] Chiapas, Mexico; 71-73.)
xD 1935LaMotte, R.S. ("Desmostylus" sookensis; British Columbia; associated flora; 51-52.)
x  1936Trelles-Duelo, L. (indeterminate sir.; Cuba; 269-270.)
x  1937Venzo, S. (Halitherium bellunense; Late Olig., Italy; 7, 13, 196.)
xD 1941bVanderHoof, V.L. (Cornwallius; Baja California; 1985.)
xD 1942aVanderHoof, V.L. (Cornwallius sookensis; Baja California; 298-301.)
x  1948Deraniyagala, P.E.P. (indeterminate sirs.; Libyan Desert, Egypt; m15.)
x  1953Maldonado-Koerdell, M. (indeterminate sir.; [actually Eoc.?] Chiapas, Mexico; 146-148.)
x  1956McKenna, M.C. (Lophiodolodus; Colombia; considered ?sir.; m739.)
   1957Hunger & Magalowski
x  1959Malde, H.E. (indeterminate sir.; South Carolina; 19, 21.)
  *1959Spillmann, F. (Halitherium; Austria)
x  1962Schäfer, W. (Halitherium schinzii; Mainz Basin, Germany; 53-56.)
x  1962Wilhelm, W. (Halitherium schinzii; Mainz Basin, Germany; 51-53.)
   1962Pietsch, K. (Germany)
xD 1964Nolan, T.B. (Desmostylus; mA137.)
x  1965Arata & Jackson (indeterminate sirs.; Mississippi; 175-177.)
x  1970Chavanon & Saubade (Halitherium; France; 261-262.)
x  1972Sittler, C. (Halitherium schinzii; France; 113.)
   1973Mastrorilli, V.I. (Italy)
x *1973Spillmann, F. (Halitherium spp.; Austria; 197-209.)
   1974May, J.H. (indeterminate sir.; Mississippi)
   1975Rabeder, G. (Austria)
xD 1976Phillips et al. (Desmostylus, Paleoparadoxia; Late Olig. [actually Early Mioc.?], Point Arena, California; 137, 152.)
x  1977Tewari et al. ("Metaxytherium sp."; Late Olig., India; 45A-49A.)
x  1978Satsangi & Trivedy (Halitherium sp.; Late Olig., India; 571-576.)
x  1980Sanders, A.E. (cf. Halitherium, cf. Metaxytherium; Late Olig., South Carolina; 612.)
x  1980Tobien, H. (Halitherium schinzii; Mainz Basin, Germany; stratigraphic occurrences; 207-209.)
   1982Zammit-Maempel, G. (indet. sirs.; Early Olig., Malta)
   1982Dockery, D.T., III (indeterminate sir.; Mississippi)
x  1982Fischer, K. (Halitherium schinzii; Leipzig, Germany; 151-153.)
x  1983Müller, A. (Halitherium schinzii; "Middle" Olig., Leipzig Bight, Germany; 71-72, pl. 27.)
  *1984Okazaki, Y. (Dugongid(?) caudal vertebrae from the Late Oligocene Honjo Formation, Ashiya Group, Fukuoka, Japan.)
xD 1986Applegate, S.P. (Cornwallius sookensis; Late Olig., Baja California; 157-158.)
xD 1986Domning et al. (Behemotops, n.gen.; Washington & Oregon; 1-12, 23, 26.)
x  1986Fleagle et al. (indeterminate sir.; Egypt; 8-9.)
x *1986Rothausen, K. (Germany; Halitherium schinzii, Anomotherium langewieschei; 520-521, 528-529, 545.)
   1988Krüger, F.J. (Anomotherium langewieschei; Late Olig., Doberg, Germany)
xD 1988Saito et al. (Behemotops sp.; Late Olig., Hokkaido, Japan; 269-273.)
x *1990MacPhee & Wyss (Puerto Rico; localities; 21, 27-36.)
   1991Freess, W.B. (Halitherium schinzii; Germany)
x  1992Gingerich, P.D. (Fayum, Egypt; stratigraphy, age, & paleoenvironments of sirs.; 67, 77.)
 D 1994Ray et al. (Behemotops proteus; Washington)
x  1995Fichter, J. (Halitherium sp,; Late Olig., Germany; 154.)
x  1995MacPhee & Iturralde-V. (indet. sir.; Early Olig., Puerto Rico; 15-16.)
x  1997bDomning, D.P. (Crenatosiren olseni; Late Oligocene, southeastern U.S.; 397-412.)
xD 1997cDomning, D.P. (Olig.-Mioc. boundary; biostratigraphic utility of sirs. & desmostylians; 178-179.)
x  1998Lucas et al. (Kazakstan; Early Olig.; 320, 325-326, 346.)
   1999Fichter, J. (Halitherium ?schinzii; Schauenburg-Hoof, Germany)
x  1999Darga et al. (indeterminate sir.; Late Olig., Bavaria, Germany; 104-105.)
   1999dDomning, D.P. (Caribbean region; review; 29.)
x  2001Böhme, M. (Halitherium; Early Olig., Leipzig Bight, Germany; 76-79.)
   2005Cahuzac & Audouin (Halitherium schinzii; France; paleoecology)
  *2006Bajpai et al. (Kutch)
   2008Diedrich, C.G. (Anomotherium langewieschei, Halitherium schinzii; Germany)
x  2008Rocher, P. (Rupelian, France; Halitherium schinzi; pl. 3.)
   2008Voss, M. (Halitherium; Germany; Lower Olig.)
 D 2009Jacobs et al. (desmostylians; Alaska)
 D*2009Beatty, B.L. (Cornwallius sookensis; Late Olig., Oregon)
x  2010Micklich & Hildebrandt (Halitherium schinzii; Early Olig., Germany; 3, 13, 18, 19.)
   2010Bizzarini & Reggiani (Halitherium schinzii; Olig., France; skull & dentition; reconstructed skeleton exhibited in Venice)
   2011Voss, M. (Halitherium schinzii; Early Olig., Münsterland, Germany)
   2011Bianucci et al. (Dugongidae indet.; Malta)
   2011Boschele et al. (Dugongidae indet.; Early Olig., Italy)
   2012Schöggl & Micklich (Halitherium schinzii; early Olig., Germany)
  *2013Fanti & Forti (indet. sir.; Oligo-Miocene, Palawan, Philippines)
   2013Reiter & Mittermayr (Halitherium cristolii; Late Olig., Linz, Austria)
   2014Voss, M.
  *2014aVélez-Juarbe & Domning (Metaxytherium albifontanum, n.sp.; Late Olig., Florida, South Carolina)
  *2014bVélez-Juarbe & Domning (Priscosiren atlantica, n.gen.n.sp.; Early Olig., Puerto Rico & South Carolina)
  *2015Vélez-Juarbe & Domning (Callistosiren boriquensis, n.gen.n.sp.; Late Olig., Puerto Rico)
 D*2015Chiba et al. (Ounalashkastylus tomidai, n.gen.n.sp.; Olig.-Mioc., Alaska)
 D*2015Beatty & Cockburn (Behemotops cf. proteus, Olig., Vancouver Is., British Columbia; Seuku, n.gen., Seuku emlongi, n.comb., Olig., Oregon)
x  2015Coster et al. (indet. sir.; Early Olig., Sirt Basin, Libya; 50-52.)
   2016Voss et al. (Austria; Lentiarenium cristolii)
  *2019Domning & Beatty (Stegosiren macei n.gen.n.sp.; South Carolina)
   2019Gol'din et al. (Dugongidae indet.; early Olig., Ukraine)
Ontocetus emmonsii Leidy, 1859 ( 1 )
x  1875Cope, E.D. (referred to Sirenia; 51.)
Ontogeny: Ontogeny: SEE Embryology and Ontogeny ( 0 )
Oregon ( 13 )
xD 1902aOsborn, H.F. (Desmostylus; 714.)
xD 1911Merriam, J.C. (Desmostylus; Mioc.; 406.)
 D 1914McCornack, E.C. (Desmostylus)
xD 1915Hay, O.P. (Desmostylus hesperus; Mioc., Astoria; 381-383.)
xD*1922Hannibal, H. (Desmostylus cymatias, n.sp.; Mioc.; 239-240.)
 D 1934Packard & Kellogg
 D 1937VanderHoof, V.L.
xD 1950Shotwell, J.A. (Desmostylus hesperus; Mioc., Astoria; 1541.)
xD 1963Mitchell & Repenning (Desmostylus; 9-10.)
x  1986Domning & Ray (halitheriine; Early Mioc.; 263-264.)
xD*1986Domning et al. (Behemotops emlongi, n.gen.n.sp.; Late Olig.; 1-4, 23, 26.)
 D*2009Beatty, B.L. (Cornwallius sookensis; Late Olig.)
 D*2015Beatty & Cockburn (Seuku, n.gen., Seuku emlongi, n.comb., Olig., Oregon)
Ornamental Use: Ornamental Use: SEE Religious, Superstitious, or Ornamental Use or Observance ( 0 )
Osmoregulation: Osmoregulation: SEE Salinity Tolerance ( 0 )
Osteology: Osteology: SEE Skeleton ( 0 )
Ounalashkastylus Chiba et al., 2015 ( 1 )
 D*2015Chiba et al. (n.gen.; Olig.-Mioc., Alaska)
Ounalashkastylus tomidai Chiba et al., 2015 ( 1 )
 D*2015Chiba et al. (n.gen.n.sp.; Olig.-Mioc., Alaska)
Oxystomus Fischer von Waldheim, 1803 ( 6 )
  *1803Fischer v. Waldheim, G. (n.gen.)
x  1872aGill, T. (syn. of Trichechus; m91.)
x  1925ICZN (syn. of Trichechus; m38.)
x  1934Hatt, R.T. (syn. of Trichechus; 534.)
x  1961Cabrera, A. (syn. of Trichechus; m309.)
x  1978cDomning, D.P. (syn. of Trichechus; m578.)
Oxystomus manatus (Linnaeus, 1758) Fischer von Waldheim, 1803 ( 2 )
  *1803Fischer v. Waldheim, G. (n.comb.)
x  1934Hatt, R.T. (syn. of Trichechus manatus; 534.)