Sargassum Nudibranch

The Sargassum Nudibranch has a long, flat body with a short blunt tail. Two tall flattened lobes rise from each side, and a single upright crest stands near the rear. Two tube-shaped head sheaths have wide flared openings. Its color can be clear yellow, green or brown, with red-brown to dark spots and many tiny white marks. Some individuals also show white patches or bright blue spots.

The Sargassum Nudibranch spends most of its life on floating or drifting Sargassum and can also live on attached clumps or algae growing on mooring lines. It feeds on hydroids growing on the branches. It can swim by bending its body from side to side and moving its raised lobes. Its eggs form a twisted yellow string wrapped around Sargassum branches.