A large nudibranch (about 2
inches) commonly known as a Blue Dorid nudibranch,
although this is the common natural coloration (purplish).
Photographed off Mainit Point near the dive resort
community of Batangas,
southern Luzon island, Philippines.
Identification: Hypselodoris bullocki
(recently reclassified from genus Chromodoris
back to Blue Dorid #1