Marcus, 1967) Diaulula phoca is a species of sea slug or dorid nudibranch, a marine gastropod mollusc in the family Discodorididae.

[3] Distribution of Diaulula phoca includes Florida, Honduras, Costa Rica, Brazil and Panama.

[3] The type locality is west side of the Key Biscayne island, Florida.

[1] The holotype is stored in the National Museum of Natural History, Smithsonian Institution.

[3] Body, rhinophores, and gill are dark purplish brown with numerous small opaque white dots.