Morales & Pickford (2005), Morlo, Miller & El-Barkooky (2007) and Morales, Pickford & Salesa (2008) suggested that Megistotherium is actually a junior synonym of Hyainailouros sulzeri, which is known by an almost complete skeleton, among other remains, and has been found in Europe, Asia and Namibia, and therefore comes from the same localities.
Morais & Pickford (2005), Morlo, Miller & O-Barkooky (2007) e Morais, Pickford & Salesa (2008) suxeriron que de feito Megistotherium é un sinónimo menor de Hyainailouros sulzeri, o cal é coñecido dun esqueleto case completo, entre outros restos, e foi achado en Europa, Asia e Namibia, e por tanto vén das mesmas localidades.