Later, in 2011 a phylogenetic analysis performed by Thompson and colleagues suggested that Antarctopelta was the basalmost known nodosaurid. In 2021, a new group of ankylosaurs, Parankylosauria, was dubbed after the discovery of Stegouros. Parankylosauria is a group of small ankylosaurs from the Southern Hemisphere that, instead of a full tail club, had a macuahuitl.
In 2011, phylogenetic analysis by Thompson and colleagues placed Antarctopelta as the most basal known nodosaurid. In 2021, a new group of ankylosaurs called Parankylosauria was discovered, named after Stegouros. Parankylosauria are small ankylosaurs from the Southern Hemisphere that lack a full tail club and instead possess a macuahuitl.