The word nudibranch literally translated is “naked gills” - from Latin nudus, naked, and the Greek βραγχια, brankhia, gills.
Powerful examples of creative evolution, nudibranchs are ridiculous color combinations, hermaphroditic, and have orgies. One species of them eats a kind of algae and never has to eat again because it forms a symbiotic relationship with the algae which photosynthesizes and produces food for it. One kind eats algae and exchanges mitochondrial DNA with it, and itself becomes able to photosynthesize!! Yet another species acquires the DNA of deadly poisonous Portuguese Man o' War jellyfish for its own use as self defense. There are more than 3,000 species of nudibranchs.
Please enjoy these photos pulled from the internet. I have about 200 more I'll post soon :).
If you want to look at more psychedelic pretty things, you can check out my tumblr called Art & Spirituality.