Durham (1950) distinguished D. granti from D. vizcainoensis by the larger tubercles on the oral surface and by its smaller size. However, spine tubercles of juvenile specimens are larger relative to test size, and specimens of D. vizcainoensis that are the same size as D. granti type material are indistinguishable from it.
Mooi, R. 1997. Sand dollars of the genus Dendraster (Echinoidea: Clypeasteroida): Phylogenetic systematics, heterochrony, and distribution of extant species. Bulletin of Marine Science 61, 343-375.