Diaphoreolis lagunae, common name orange-face cuthona, is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Trinchesiidae.

[2] This species has been recorded along the Eastern Pacific coastline of North America from Curry County, Oregon, United States to Bahía Tortugas, Mulegé Municipality, Baja California, Mexico.

[3] Diaphoreolis lagunae feeds on the hydroid Sertularella turgida, family Sertulariidae.

[4]