The Broad-stripe Flatworm (turbellarian platyhelminth) has a very distinctive colour pattern with alternating cream and black stripes and a distinctive bright yellow edge. It vaguely mimics the colour patterns and shapes seen in nudibranchs, and also has a few edge ruffles and simple pseudo-tentacles, but these are simply folds in its body and it is completely unrelated to the nudibranch molluscs. It can be seen commonly moving about during the day, feeding on colonial sea squirts (ascidians), and has toxic chemicals which deter fish predators. It is likely that these noxious chemicals come from its food.
Common on reefs throughout the Pacific.
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