Octávio Mateus, Susannah Maidment and Nicolai Christiansen named and shortly described Miragaia in 2009.
Alberto Cobos et alii in 2010 noted that all the diagnostic characters of Miragaia longicollum are based on skeletal elements that are absent in the Dacentrurus holotype found in England in layers of about the same age, while all traits that can be compared are shared by both genera.