Alex Mustard / 2020VISION / White nudibranch (Eubranchus farrani) on kelp frond, Lunna Kirk, Shetland Islands, Scotland, UK, June

Todd Mintz / Thick horned aeolid / Opalescent nudibranch,(Hermissenda crassicornis) Vancouver Island, British Columbia, Canada, August

Juergen Freund / Aeolid nudibranch (Flabellina rubrolineata) on tunicate, Batangas, Philippines.

Juergen Freund / Aeolid nudibranch (Cuthona kanga) on white background, Batangas, Philippines.

Juergen Freund / Nudibranch (Hypselodoris / Chromodoris bullocki) laying eggs with two aeolid nudibranchs feeding on the eggs. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Aeolid nudibranch (Flabellina rubrolineata) laying its eggs. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Aeolid nudibranch (Flabellina rubrolineata) right before laying its eggs. Lembeh Strait, North Sulawesi, Indonesia.

Tim Laman / Thick horned aeolid nudibranch (Hermissenda crassicornis) and Sea anemones in the Channel Islands, Pacific, California, USA

Dan Burton / Aeolid Nudibranch (Flabellina affinis), Corsica, Mediterranean

Juergen Freund / Aeolid Nudibranch (Flabellina affinis), Mediterranean

Juergen Freund / Opalescent / Thick horned nudibranch {Hermissenda crassicornis} Pacific, Canada

Juergen Freund / Opalescent / Thick horned nudibranch {Hermissenda crassicornis} Pacific, Canada

Juergen Freund / Aeolid nudibranch with egg ribbon {Flabellinopsis iodinea} Indo-pacific

Solvin Zankl / Aeolid nudibranch {Pteraeolidia ianthina}

Juergen Freund / Thick horned aeolid (Hermissenda crassicornis) Canada, Pacific

Jeff Rotman / Flabellina nudibranch {Flabellina affinis} moving in open ocean at night, Italy, Europe

Juergen Freund / Aeolid nudibranch. (Flabellinopsis iodinea) CA, USA

Juergen Freund / Aeolid nudibranch, Mediterranean (Flabellina affinis)

Juergen Freund / Aeolid nudibranch, Mediterranean Sea

Juergen Freund / Aeolid nudibranch, Mediterranean Sea

Juergen Freund / Thick horned aeolid nudibranch, Canada

Jeff Rotman / Thick horned aeolid / nudibranch {Hermissenda crassicorn} California Pacific USA

Jeff Rotman / Thick horned aeolid / nudibranch {Hermissenda crassicorn} Pacific Ocean off California, USA

Carine Schrurs / Aeolid nudibranch {Phyllodesmium kabiranum} Anilao Batangas Philippines