ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Nudibranch (Philinopsis depicta). Nudibranchs, (meaning naked gills) are sea slugs without a shell or true gills. There are over 2000 species, and they are noted for their extraordinary colours and elaborate shapes. They are carnivorous, feeding on other invertebrates. This species is found in the Mediterranean.
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