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.
Brandon Cole / Verco's Nudibranch (Tambja verconis) close-up detail of gills. Poor Knights Islands Marine Reserve, New Zealand, Pacific Ocean.
Ammonite / Close-up of a Yellow slug (Limax flavus) moving towards the camera leaving a slime trail and extending and retracting its eyestalk, footage taken using an endoscopic camera, Bristol, England, UK, Marc...
Ammonite / Close-up of a Yellow slug (Limax flavus) leaving a slime trail as it moves, footage taken using an endoscopic camera, Bristol, England, UK, March.
Alex Mustard / 2020VISION / Nudibranch eggs (Tritonia hombergi) Loch Carron, Ross and Cromarty, Scotland, UK, April
Jurgen Freund / Chromodoris nudibranch (Cadlinella sp.) Lembeh Strait, North Sulawesi, Indonesia.
Stephen Dalton / Great grey / Leopard slug (Limax maximus) on toadstool, UK, controlled conditions
Norbert Wu / Flamingo Tongue Snail (Cyphoma gibbosum) feeding on Common Sea Fan (Gorgonia ventalina) showing deep purple tone where the Sea Fan has released protective compounds, Saba, Caribbean
Birgitte Wilms / Nudibranch laying eggs, Indonesia
Gary Bell/ Oceanwide / Sea Swallow (Glaucus atlanticus) feeding on stinging tentacles of Hydrozoan (Porpita sp), Coffs Harbour, New South Wales, Australia
Fred Bavendam / Cowry living on Sea Fan (Solenocaulon sp), Bali, Indonesia
Pascal Kobeh / Pleurobranch nudibranch (Pleurobranchus forskali) Sulu Sea, Philippines
Nick Upton / Celtic sea slug (Onchidella celtica) from Atlantic Ocean. Cornwall, England, UK. September.
Nick Upton / Celtic sea slug (Onchidella celtica) crawling over rock exposed on low spring tide. Cornwall, England, UK. September.
Linda Pitkin / Side-gilled slug, Pleurobranch (Pleurobranchus grandis), at night Gordon Reef, Straits of Tiran, Egypt, Red Sea
Nick Upton / Celtic sea slug (Onchidella celtica) crawling over barnacles attached to rock at low spring tide, Cornwall, UK, April.
Linda Pitkin / Nudibranch (Thuridilla lineolata) Sangeang, off Sumbawa, Indonesia.
Georgette Douwma / Sea slug (Plakobranchus ocellatus) on sand. Raja Ampat, West Papua, Indonesia.
Constantinos Petrinos / Side-gilled slug (Pleurobranchus mammalatus) Lembeh Strait, North Sulawesi, Indonesia.
Sue Daly / Yellow-plumed sea slug (Berthella plumula) Sark, British Channel Islands.
Alex Mustard / Tiny (7mm) herbivorous sap-sucking seaslug (Costasiella kuroshimae) crawling over piece of algae next to its circular egg ribbon. Seraya, Bali, Indonesia. Java Sea
Alex Mustard / Details of ruffled mantle extensions on the Sacoglossan sea slug (Tridachia crispata) These also contain the chloroplasts of their algae food, that continue to photosynthesise inside the mollusc and p...
Franco Banfi / Headshield slugs (Micromelo undatus) Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean