Dermatobranchus caeruleomaculatus, nudibranch (20mm in size), horizontal, profile. It’s whitish, with reddish brown pigment covering most of the notum; longitudinal lines, and opaque white spots also present; a pale yellow margin and blue markings on the edge of the notum, foot and oral veil. Feeds on the soft coral (Dendronephthya sp,). Displays trailing behaviour. Underwater macro photography taken in Lembeh, Manado - Indonesia.