Diaulula greeleyi was found on sandy bottomed amoung sea grass.
This sea slug is large and flat. The mantle is covered with caryophyllidia, giving the back a furry appearance.
The mantle can be yellow to yellowish brown with darker brown patches. Some whitish patches around the mantle edge. The rhinophores and gills are iften surrounded by a high sheath.The gills are large,simple and unbranched.The underside of this sea slug is bright yellow in colour.
There are no information available about the diet of Diaulula greeleyi.Other sea slugs genus Diaulula feed on sponges.