Land slugs and snails are dull affairs that leave little to be desired, but if you've ever been deep sea diving you will know that the ocean’s versions are much more vibrant. Hidden beneath the sea are hundreds and thousands of colorful slugs, in bright hues that would make you think they’re from another planet. Many of these colorful creatures used to be snails that shed their shells and evolved into sublime sea slugs.
Cuthona sibogae

Lettuce sea slug (Elysia crispata)
Nembrotha kubaryana

Okenia hopkinsia rosacea

Donut nudibranch (Doto greenamyeri) 
Hydatina physis

Phyllidiella pustulosa


Cadlinella ornatissima

Sea sheep (Costasiella kuroshimae) 
Hypselodoris kanga

Janolus fuscus
Hypselodoris festiva

Chromodoris strigata

Phyllodesmium serratum

Sacoglossan sea slug (Cyerce nigrican) 
Glossodoris atromarginata

Hermissenda crassicornis

Dirona albolineata

Chromodoris reticulata

Blue angel (Glaucus atlanticus)

Phyllodesmium poindimiei

h/t: boredpanda
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