Harold & Telford (1990) give an excellent review of this genus together with a key to the species. It differs from Leodia in having no lunule in the anterior ambulacrum (see Mooi & Peterson 2000 for discussion). Differs from Lathonia by its bidentate pedicellariae enlarged terminal teeth and wide space between food grooves and ambulacral lunule edges
According to Mooi & Peterson (2000) Miocene records of Mellita in the literature are based on out-dated age assignments and misidentifications.
Coppard, S. E. 2016. A new genus of mellitid sand dollar (Echinoidea: Mellitidae) from the eastern Pacific coast of the Americas. Zootaxa, 4111, 158-166.
J. W. Durham, 1961. The echinoid Mellita in the Pacific coast Cenozoic. Los Angeles County Museum Contributions in Science 48, 3-12.
Harold, A. S. & Telford, M. 1990. Systematics, phylogeny and biogeography of the genus Mellita (Echinoidea: Clypeasteroida). Journal of Natural History 24, 987-1026.
R. Mooi & D. Peterson 2000. A new species of Leodia (Clypeasteroida: Echinoida) from the Neogene of Venezuela and its importance in the phylogeny of mellitid sand dollars. Journal of Paleontology 74, 1083-1092.