The nomenclatural history of this taxon is complicated and was clarified by Foster & Philip (1976a). They suggested Holaster australis was synonymous with Corystus dysasteroides (Duncan), but the smaller unsunken pore-pairs indicate at least specific distinction.
Foster, R. J. & Philip, G. M. 1976a. Corystus dysasteroides, a Tertiary holasteroid echinoid formerly known as Duncaniaster australiae. Transactions of the Royal Society of South Australia 100, 113-116.
Lambert, J. 1896. Notes dur quelques echinides cretaces de Madagascar. Bulletin de la Societe geologique de France, (3), 24, 313-331, 3 pls.