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

Georgette Douwma / Nudibranch (Phyllodesmium rudmani) which perfectly mimics Xenia soft coral polyps on which it feeds, Lembeh Strait, North Sulasesi, Indonesia. December.

Franco Banfi / Opalescent nudibranch (Hermissenda crassicornis), Alaska, United States, North Pacific Ocean.

Franco Banfi / Opalescent nudibranch (Hermissenda crassicornis) Vancouver Island, British Columbia, Canada, Pacific Ocean

Pascal Kobeh / Opalescent nudibranch (Hermissenda crassicornis), Alaska, USA, Gulf of Alaska. Pacific ocean.

MYN / Dimitris Poursanidis / Ventral view of Mediterranean Violet Aeolid (Flabellina affinis) Crete, Greece, November. Meetyourneighbours.net project

Alex Mustard / Aeolid nudibranch (Flabellina pedata) feeding on its prey of hydroids. This species cannot only eat the stinging hydroids without getting stung, but the stinging nematocysts of the hydoid pass through...

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.