"There are several species in this colour group of Glossodoris with large white blotches/pustules on the dorsum (i.e., Glossodoris undaurum, Glossodoris tomsmithi, plus some unnamed species), but Glossodoris undaurum alone is characterised by the golden-yellow band at the edge of the mantle and foot, and by the thin red lines on the axes of the gills. Glossodoris undaurum seems to extend all through the Indian Ocean."