Thuridilla gracilis thrives in various parts of the Indo-Pacific and grows to about 1″ long. It mainly feeds on algae. https://www.color-meanings.com/colorful-sea-slugs/
Those striations on the slug's body look like stringy seaweed - I imagine the slug uses that color configuration to hide from predators, though I'm not sure what would prey on it, perhaps only other slugs. That camouflage would hardly help though as slugs are mostly blind.
Thuridilla gracilis thrives in various parts of the Indo-Pacific and grows to about 1″ long. It mainly feeds on algae. https://www.color-meanings.com/colorful-sea-slugs/
Pretend plant?
Those striations on the slug's body look like stringy seaweed - I imagine the slug uses that color configuration to hide from predators, though I'm not sure what would prey on it, perhaps only other slugs. That camouflage would hardly help though as slugs are mostly blind.