Alex Mustard / Nudibranchs (Doto greenamyeri) newly described species on feather hydroids. Seraya Bay, north coast of Bali, Indonesia. Java Sea.

Alex Mustard / Portrait of a Nudibranch (Flabellina pellucida) on a kelp frond with star trails. Gulen, Norway. North East Atlantic Ocean.

Alex Mustard,Alex Mustard / A nudibranch (Dendronotus frondosus) photographed in the field aquarium, Gulen, Norway. North East Atlantic.

Alex Mustard,Alex Mustard / A portrait of a nudibranch ( Limacia clavigera) searching for food on algae. Gulen, Norway. North East Atlantic Ocean.

Alex Mustard / 2020VISION / Nudibranch (Limacia clavigera) feeding on Sea matt bryozoan, growing on kelp frond, Shetland Islands, Scotland, UK, June

Alex Mustard / 2020VISION / Nudibranch eggs (Tritonia hombergi) Loch Carron, Ross and Cromarty, Scotland, UK, April

Alex Mustard / 2020VISION / Nudibranch (Polycera quadrilineata) portrait on a kelp frond, Island of Coll, Inner Hebrides, Scotland, UK, June.

Alex Mustard / 2020VISION / Nudibranch (Polycera quadrilineata) feeding on sea mat (bryozoan) growing on kelp frond. Shetland Islands, Scotland, UK. June.

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

Juergen Freund / Detail of Nudibranch (Dendrodoris tuberculosa) Batangas, Philippines.

Juergen Freund / Nudibranch (Jorunna funebris) feeding on its preferred sponge, Kimbe Bay, West New Britain, Papua New Guinea

Juergen Freund / Nudibranchs (Chromodoris lochi) crawling on a sea squirt. North Raja Ampat, West Papua, Indonesia.