Achillesaurus

Achillesaurus is a genus of alvarezsaurid theropod dinosaur from the Santonian-age Upper Cretaceous Bajo de la Carpa Formation of Rio Negro, Argentina. It was named in reference to Achilles' heel, because diagnostic features are found there for these animals. The genus was a relatively large, basal alvarezsaurid, and a contemporary of "Alvarezsaurus". "Achillesaurus" is based on MACN-PV-RN 1116, a partial skeleton including a sacral vertebra, four tail vertebrae, part of the left thighbone, shin and foot, and the left ilium. Agustín Martinelli and Ezequiel Vera, who described the specimen, performed a phylogenetic analysis and found their new genus to be an alvarezsaurid with an unresolved relationship to "Alvarezsaurus" and more derived alvarezsaurids. Makovicky, Apesteguía & Gianechini (2012) argued that "Achillesaurus" might actually be a junior synonym of "Alvarezsaurus" which, according to the authors, "is known from the same formation and from which it [i.e. "Achillesaurus"] differs trivially."