Means “best (specimen) lizard” from Late Triassic or Early Jurassic South Africa. Its name alludes to the preservation of the fossil; one of the Transvaal Museum’s best specimens, a nearly complete skeleton. Named by van Hoepen in 1920. It is now considered “an invalid name” for Massospondylus, a herbivorous Saurischian dinosaur from the late Triassic period.