Diamondback Tritonia (Tritonia festivia)
…a species of Tritoniid nudibranch which occurs in the northeast Pacific, ranging from south-central Alaska to northern Baja California. It is also known from Japan as well. Like other members of the family Tritoniidae diamondback Tritonia are predators and will feed on sessile animals like soft corals, gorgonians, and other anthozoans. The frontal veil of Tritonia festiva is very sensitive and is used to locate polyps that are not retracted. If located T. festivia will swiftly lunge int other colony and bite off the polys before the can contract into cover.
If threatened T. festiva can escape from predators like sea stars by swimming upwards.
Image: Daniel Hershman