Diaphoreolis lagunae, common name orange-face cuthona, is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Trinchesiidae.
This species has been recorded along the Eastern Pacific coastline of North America from Curry County, Oregon, United States to BahÃÂa Tortugas, Mulegé Municipality, Baja California, Mexico.
Diaphoreolis lagunae feeds on the hydroid Sertularella turgida, family Sertulariidae.