Although Koehler originally placed his species indicus in the genus Brisaster, Lambert (1920) subsequently erected a new genus, Indiaster, to accommodate it. It supposedly differed on account of its paired petals being almost superficial. This is simply on account of the small size and immaturity of the material being described by Koehler (note this specimen has no gonopores open). Subsequently Lambert & Thiery (1924, p. 530) treated this as a synonym of Brisaster.
Koehler, R. 1914. Echinoderma of the Indian Museum, VIII, Echinoidea (i) Spatangides. Indian Natural History Museum, Calcutta: 257 pp., 20 pls