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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Polyonax (meaning master over many ) was a genus of dinosaur from the late Maastrichtian-age Denver Formation of Colorado, . Founded upon poor remains, it is today regarded as a dubious name.During an 1873 trip through the western US, and naturalist Edward Drinker Cope collected some fragmentary dinosaurian material which he soon named as a new genus. Catalogued today as AMNH FR 3950, the type material included three , limb bone material, and what are now known to be horn cores, from a subadult individual. Although it was briefly mixed up with , and even considered to be a possible synonym of Trachodon, it was recognized as a horned dinosaur in time for the first monograph on horned dinosaurs (1907), wherein it was regarded as based on indeterminate material. Today, the name is used as little more than a historical curiosity, as it dates from a time before horned dinosaurs were known to exist.

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