The ground colour is translucent greyish-white to cream. On the head is a large, rhomboidal, orange-red blotch. Rhinophores are orange, cerata with orange tips, oral tentacles are opaque white. A median line on posterior foot, dark, usually black ceratal (vary from ochre to almost black) digestive gland duct.
Diaphoreolis lagunae feeds on the ZIG-ZAG Hydroid Sertularella turgida.