Amazing mimicry: Pseudoceros imitatus

Pseudoceros imitatus (Mimic Flatworm), one of my favourite flatworms, mimic Phyllidiella pustulosa (Pimpled Phyllidiella), very common toxic nudibranch. Phyllidiella can emit very toxic substances on the skin, extracting them from the sponges it feeds on. Our flatworm unfairly enjoys poisonous fame, avoided by predators!

Pseudoceros imitatus (Flatworm!)

Can you tell flatworm from nudibranch on this photo?

Do you see the difference?
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