This species is widespread throughout the Indo-Pacific, though uncommon in the specific areas of the Philippines where I have been diving.

Many nudibranchs have the ability to retract their gill plume when disturbed (orange in color, toward the top of the photo on the specimen on the left). This sometimes makes it difficult to get a photo with the gills extended. Sometimes even a mild current will cause a nudibranch to partially retract its gill plume.

Identification: Hypselodoris mouaci (formerly Hypselodoris maridadilus)

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