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Re: Species of Triceratops



Here are the relevant taxa as listed in the current text of MM #3 second 
printing (sorry about missing italics and boldface; would make intepretation 
of list visually easier). All named species of Triceratops are listed here 
somewhere:

Agathaumas Cope, 1872 [nomen dubium; = Triceratops or Torosaurus?]
    = Agathaumus Hulke, 1882 [sic]
    = Egothamus [sic; in the motion picture The Lost World, as reported by 
Breithaupt, 1994]
    A. sylvestris Cope, 1872â
        = Agathaumas silvestre Cope, 1892 [sic]
        = Agathaumas sylvestre Cope, 1875 [sic]
        = Triceratops sylvestris (Cope, 1872) emend. Olshevsky, 2000 [nomen 
dubium]
        = Triceratops silvestris (Cope, 1872) Kuhn, 1936 [nomen dubium]Â

Ceratops Marsh, 1888/Rafinesque, 1815 [nomen dubium]
    = Proceratops Lull, 1906 [nomen dubium]
    C. montanus Marsh, 1888â
        = Proceratops montanus (Marsh, 1888) Lull, 1906 [nomen dubium]â
        = Triceratops montanus (Marsh, 1888) [sic; typographical error in 
Ostrom & Wellnhofer,
            1986; J. H. Ostrom, pers. comm.]
NOTE: Substitution of Proceratops for Ceratops by Lull (1906) as a 
replacement name is considered unnecessary because the bird genus Ceratops 
Rafinesque, 1815 lacks a formal description and is thus a nomen nudum. 
Conservation of the doubtful name Ceratops is desirable in order to retain 
the well-known family name Ceratopidae (or, less correctly, Ceratopsidae), of 
which it is the type genus.

Diceratops Hatcher vide Lull, 1905
    D. hatcheri Hatcher vide Lull, 1905â
        = Triceratops hatcheri (Hatcher vide Lull, 1905) Lull, 1933
NOTE: Recent work on the systematics of the genus Triceratops by Catherine A. 
Forster (presented at the 1990 SVP annual meeting, and in her doctoral 
dissertation) indicates that Diceratops is a genus distinct from Triceratops, 
not a junior synonym as Lull (1933) maintained.

Torosaurus Marsh, 1891
    T. latus Marsh, 1891â
        = Torosaurus gladius Marsh, 1891
        = Triceratops galeus Marsh, 1889 [nomen dubium]
        = Trioceratops galens Keyes, 1894 [sic]
    T. utahensis (Gilmore, 1946) Lawson, 1976
        = Arrhinoceratops utahensis Gilmore, 1946

Triceratops Marsh, 1889
    = Claorhynchus Cope, 1892 [nomen dubium]
    = Polponax Osborn, 1902 [sic]
    = Polygonax Hatcher, 1902 [sic]
    = Polyona Baur, 1891 [sic]
    = Polyonax Cope, 1874 [nomen dubium; juv.]
    = Sterrholophus Marsh, 1891
    = Tirceratops Parks, 1925 [sic]
    = Tricerotops Stokes, 1988 [sic]
    = Trioceratops Keyes, 1894 [sic]
    = Trisceratops Keyes, 1894 [sic]
    = Triteratops von Huene, 1929 [sic]
    = Ugrosaurus Cobabe & Fastovsky, 1987 [nomen dubium]
    ?T. alticornis (Marsh, 1887) Lull vide Hatcher, Marsh & Lull, 1907 [nomen 
dubium]
        = Bison alticornis Marsh, 1887 [nomen dubium]
        = Ceratops alticornis (Marsh, 1887) Marsh, 1889 [nomen dubium]
    T. horridus (Marsh, 1889) Marsh, 1889â
        = Ceratops horridus Marsh, 1889
        = Polyonax mortuarius Cope, 1874 [nomen dubium] [juv.]â
        = Agathaumas mortuarius (Cope, 1874) Hay, 1902 [nomen dubium; juv.]
        = Triceratops mortuarius (Cope, 1874) Kuhn, 1936 [nomen dubium; juv.]
        = Triceratops flabellatus Marsh, 1889
        = Agathaumas flabellatus (Marsh, 1889) Scott, 1900
        = Sterrholophus flabellatus (Marsh, 1889) Marsh, 1891â
        = Triceratops sulcatus Marsh, 1890 [nomen dubium]
        = Triceratops serratus Marsh, 1890
        = Triceratops elatus Marsh, 1891
        = Claorhynchus trihedrus Cope, 1892 [nomen dubium]â
        = Trioceratops flabellatus Keyes, 1894 [sic]
        = Trioceratops horridus Keyes, 1894 [sic]
        = Trisceratops elatus Keyes, 1894 [sic]
        = Triceratops obtusus Marsh, 1898
        = Triceratops calicornis Marsh, 1898
        = Triceratops californis Wolcott, 1900 [sic]
        = Polponax mortuarius Osborn, 1902 [sic]
        = Polygonax mortuarius Hatcher, 1902 [sic]
        = Triceratops ingens Lull, 1915 [nomen nudum]
        = Triceratops maximus Brown, 1933 [nomen dubium]
        = Triceratops albertensis C. M. Sternberg, 1949
        = Triceratops brevirostris Sloan, 1976 [sic]
        = Ugrosaurus olsoni Cobabe & Fastovsky, 1987 [nomen dubium]â
        = Triceratops sternbergii Forster, 1990 [nomen manuscriptum]
        = Triceratops hossidus Howgate, 1995 [sic; in Dinosaur Collector's 
Club Newsletter]
    T. prorsus Marsh, 1890
        = Agathaumas prorsus (Marsh, 1890) Lydekker, 1893
        = Triceratops porosus Marsh, 1891 [sic]
        = Triceratops brevicornus Hatcher, 1905 [juv.]
        = Triceratops brevicornis Parks, 1925 [sic]
    ?T. eurycephalus Schlaikjer, 1935
        = Triceratops eurycephalus [Anonymous] 1934 [nomen nudum; in Science 
News Letter
            June 16, 1934]
NOTE: Recent work on the systematics of Triceratops by Catherine A. Forster, 
reported at the 1990 SVP annual meeting, suggests Triceratops eurycephalus is 
a species distinct from T. horridus and may belong in a different genus. 
Forster (1993) referred Ugrosaurus olsoni to Triceratops as Triceratops sp., 
but it is probably yet another synonym of Triceratops horridus. In her 
doctoral dissertation, Forster (1990) described the new species Triceratops 
sternbergii, based on AMNH 5116, previously referred to T. elatus, but she 
now (pers. comm.) considers it to be another T. horridus. The balance of the 
species in this genus are organized according to Ostrom & Wellnhofer (1986) 
and Forster (1996).