Diaulula greeleyi is a species of sea slug or dorid nudibranch, a marine gastropod mollusc in the family Discodorididae.
Distribution of Diaulula greeleyi include Rio de Janeiro State, southeastern Brazil.
The maximum recorded body length is 47 mm.
Minimum recorded depth is 0 m. Maximum recorded depth is 2 m.
Prey of Diaulula greeleyi include sponges Lissondendoryx isodictialis and Haliclona sp.