|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Perissodactyla - Brontotheriidae
It was recombined as Symborodon heloceras by Cope (1873), Cope (1875) and Osborn (1902); it was recombined as Titanotherium heloceras by Osborn (1896); it was recombined as Menodus heloceras by Osborn (1929) and Emry (1975); it was recombined as Menops heloceras by Mader (1989) and Mader (1998).
|Year||Name and author|
|1873||Megaceratops heloceras Cope|
|1873||Symborodon heloceras Cope p. 14|
|1875||Symborodon heloceras Cope p. 487|
|1896||Titanotherium heloceras Osborn p. 179|
|1902||Symborodon heloceras Osborn|
|1929||Menodus heloceras Osborn|
|1975||Menodus heloceras Emry|
|1989||Menops heloceras Mader|
|1998||Menops heloceras Mader|
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.