ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Nudibranch (Colga pacifica). 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.
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