The genus name is derived from the ancient greek: hēmi-, “half” and auchēn, “neck”.Discovered in south America in 1880.Described in north America, in 1883, by Edward Drinker Cope. Found Se Alberta, Canada to central Mexico. Including Floridia, South Carolina, Mississippi, Texas, Kansas, Nebraska, Arizona, California, Oklahoma, New Mexico, Oregon, Colorado, and Washington. South American fossils…