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Ceratosoma gracillimum
This nudibranch looks similar to Ceratosoma tenue and Ceratosoma trilobatum. What makes it identifiable is the smooth region behind its head and before the lateral lobes; in other words, there's a break in the mantle.
Spotted this nudi on a soft tree coral at a depth of about 15m. It was about 2.5cm long.
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