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 in Canada to central Mexico. Including SE Alberta. And, in Floridia, South Carolina, Mississippi, Texas, Kansas, Nebraska, Arizona, California, Oklahoma, New Mexico, Oregon, Colorado, and Washington. South American…