Nudibranchs are one my favorite creatures to shoot underwater. I find their shape, size and color patterns quite unique. There are over 3,000 species of Nudibranchs.
The Halgerda batangas is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Discodorididae.
This image was captured in the Philippines with a Sealife DC2000 underwater camera.