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.

Juergen Freund / Nudibranchs (Hypselodoris / Chromodoris bullocki) mating and laying eggs, Lembeh Strait, North Sulawesi, Indonesia

Hiroya Minakuchi / Nudibranch (Hypselodoris bullockii) pair mating, Borneo, Malaysia

Juergen Freund / Chromodoris nudibranch (Cadlinella sp.) Lembeh Strait, North Sulawesi, Indonesia.

Wild Wonders of Europe / Lundgren / Gibraltar nudibranch (Tambja ceutae) Pico, Azores, Portugal, July 2009

Wild Wonders of Europe / Banfi / Nudibranch (Flabellina affinis) on algae (Caulerpa taxifolia) Larvotto Marine Reserve, Monaco, Mediterranean Sea, July 2009

Wild Wonders of Europe / Lundgren / Nudibranchs (Onchidoris muricata) on Kelp leaf, Moere coastline, Norway, February 2009

Wild Wonders of Europe / Lundgren / Nudibranch (Polycera quadrilineata) on Kelp leaf, Moere coastline, Norway, February 2009 WWE BOOK PLATE. Wild Wonders kids book.

Wild Wonders of Europe / Lundgren / Nudibranch (Dendronotus frondosus) on a Kelp leaf, Moere coastline, Norway, February 2009

Wild Wonders of Europe / Lundgren / Nudibranch (Flabellina lineata) on seaweed, Saltstraumen, Bod, Norway, October 2008

Wild Wonders of Europe / Pitkin / Nudibranch / Sea slug (Discodoris / Peltodoris atromaculata) feeding on a sponge (Petrosia ficiformis) Cala di Grecu, Lavezzi Islands, Corsica, France, September 2008

Wild Wonders of Europe / Lundgren / Nudibranch (Flabellina verrucosa) on seaweed, Saltstraumen, Bod, Norway, October 2008

Wild Wonders of Europe / Lundgren / Three Nudibranchs (Polycera quadrilineata) on Kelp encrusted with Sea-mat / Lacy crust bryozoan (Membranipora membranacea) Saltstraumen, Bod, Norway, October 2008

Wild Wonders of Europe / Lundgren / Nudibranch (Flabellina verrucosa) on seaweed, Saltstraumen, Bod, Norway, October 2008

Birgitte Wilms / Nudibranch laying eggs, Indonesia

Juergen Freund / White lined / Alabaster nudibranch or Falling archangel {Dirona albolineata} Canada, Pacific

Doug Perrine / Dorid nudibranch {Nembrotha kubaryana} feeding on tunicates, Borneo

Solvin Zankl / Nudibranch {Chromodoris sp} Lembeh Strait, Indonesia

Solvin Zankl / Nudibranch {Nembrotha purpureolineolata} Lembeh Strait, Indonesia

Norbert Wu / Nudibranch (Chromodoris sp) breathes through gills on back, Borneo

Michele Westmorland / Nudibranch (Aegires serenae), Palau, Micronesia.

Michele Westmorland / Nudibranch (Nembrotha purpureolineata) feeding, Cannibal Rock, Rinca Island, Indonesia

Jeff Rotman / Giant Dendronotid Nudibranch (Dendronotus iris) swimming at night, Vancouver Island, British Columbia, Canada, North Pacific Ocean

Jeff Rotman / Giant Dendronotid Nudibranch (Dendronotus iris) close up detail, Vancouver Island, British Columbia, Canada, North Pacific Ocean

Jeff Rotman / Giant Red Dendronotid Nudibranch (Dendronotus rufus) swimming below surface, Vancouver Island, British Columbia, Canada, North Pacific Ocean

Alex Mustard / Nudibranch (Chromodoris reticulata) Celebes Sea, Mabul Island, Sabah, Malaysia. Borneo. It was discovered in 2013 that this species has a 'disposable penis', which is shed after mating and regrows in...

Alex Mustard / Nudibranch (Chromodoris reticulata) Batanta Island, Raja Ampat, West Papua, Indonesia. It was discovered in 2013 that this species has a 'disposable penis', which is shed after mating and regrows in 2...

Christophe Courteau / Common grey seaslug {Aeolidia papillosa} feeds on sea anemone Brittany France

Christophe Courteau / Common grey seaslug {Aeolidia papillosa} feeds on sea anemone Brittany France

Christophe Courteau / Sea hare {Aplysia punctata} Brittany France

Christophe Courteau / Sea hare {Aplysia punctata} Brittany France

Christophe Courteau / Nudibranchs {Limacia clavigera} left {Polycera quadrilineata} right - laying

Christophe Courteau / Nudibranchs mating {Limacia clavigera} France Brittany

Solvin Zankl / Nudibranch (Flabellina verrucosa) on red algae, Atlantic Ocean, North West Norway

Chris Newbert / Nudibranch (Halgerda malesso) skin, Indonesia

Chris Newbert / Nudibranch (Glossodoris cincta), Indonesia

Alex Mustard / 2020VISION / Nudibranch (Facelina auriculata) searching for its food of small hydroids by climbing on a blade of Seagrass / Eelgrass (Zostera marina) in seagrass meadow. Helford Estuary, Cornwall, UK, July

Alex Mustard / Lettuce leaf sea slug / nudibranch (Elysia crispata) crawls over the reef, Seven Mile Beach, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

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

Solvin Zankl / Nudibranch (Cratena peregrina) San Pietro Island, Sardinia, Italy, Mediterranean, July

Pete Oxford / Lettuce nudibranch (Elysia crispata) Bonaire, Netherlands Antilles, Caribbean

Linda Pitkin / 2020VISION / Nudibranch (Tritonia hombergi), St Abbs (St Abbs and Eyemouth Voluntary Marine Reserve), Berwickshire, Scotland, UK, October 2011

MYN / Jerry Monkman / Red-gilled nudibranch (Flabellina verrucosa) Rye, New Hampshire, USA, January. meetyourneighbours.net project

MYN / Jerry Monkman / Bushy backed nudibranch (Dendronotus frondosus) Rye, New Hampshire, USA, August. meetyourneighbours.net project

MYN / Jerry Monkman / Bushy backed nudibranch (Dendronotus frondosus) Rye, New Hampshire, USA, August. meetyourneighbours.net project

MYN / Jerry Monkman / Bushy backed nudibranch (Dendronotus frondosus) Rye, New Hampshire, USA, August. meetyourneighbours.net project

MYN / Jerry Monkman / Bushy backed nudibranch (Dendronotus frondosus) Rye, New Hampshire, USA, August. meetyourneighbours.net project

MYN / Jerry Monkman / Bushy backed nudibranch (Dendronotus frondosus) Rye, New Hampshire, USA, August. meetyourneighbours.net project

Alex Mustard / 2020VISION / Large nudibranch (Tritonia hombergi) with eggs. The eggs are from this species of nudibranch and the adult seems to be feeding on them, which is unusual. The adult may have just laid the eggs and may...

Alex Mustard / 2020VISION / Pair of Nudibranch's (Polycera quadrilineata) mating on a sea matt bryozoan, growing on a kelp frond. Island of Coll, Inner Hebrides. Scotland, UK, June

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

Alex Mustard / 2020VISION / Nudibranch (Tritonia hombergi) feeding on soft coral Dead man's fingers (Alcyonium digitatum) Loch Carron, Scotland, UK, April

Alex Mustard / 2020VISION / Nudibranch (Facelina auriculata) feeding on small hydroids growing on top of a rock, Selsey, West Sussex, UK, May

Alex Mustard / 2020VISION / Nudibranch (Facelina auriculata) searching for small hydroids on top of a boulder, Selsey, West Sussex, UK, May

Alex Mustard / 2020VISION / Nudibranch (Flabellina pedata) gliding over a red sponge, Selsey, West Sussex, UK, May

Sue Daly / Nudibranch (Doris sticta). Channel Islands, UK, August.

Sue Daly / Nudibranchs (Polycera faeroensis) mating. Channel Islands, UK, June.

Sue Daly / Nudibranch (Thecacera pennigera) moving past some sea squirts. Channel Islands, UK, June.

Sue Daly / Nudibranch (Thecacera pennigera). Channel Islands, UK, June.

Sue Daly / Nudibranch (Polycera faeroensis). Channel Islands, UK, June.

Sue Daly / Two Nudibranch (Polycera faeroensis). Channel Islands, UK, May.

Georgette Douwma / Nudibranch (Halgerda batangas). Superfamily Cryptobranchia, family Discodorididae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Halgerda batangas). Superfamily Cryptobranchia, family Discodorididae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Glossodoris atromarginata). Superfamily Cryptobranchia, Family Chromodorididae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Jorunna funebris). Superfamily Cryptobranchia, family Discodorididae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / 'Sea Bunny' Nudibranch (Jorunna parva). Superfamily Cryptobranchia, family Discodorididae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Phyllodesmium crypticum). Suborder Aeolidina, family Facelinidae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Glossodoris cincta). Superfamily Cryptobranchia, family Chromodorididae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Trinchesia yamasui). Suborder Aeolidina, Family Tergipedidae, Genus Trinchesia. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Chromodoris aureopurpurea). Superfamily Cryptobranchia, family Chromodorididae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Nembrotha chamberlaini). Superfamily Phanerobrancia, family Polyceridae, subfamily Nembrothhinae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Phyllodesmium crypticum). Suborder Aeolidina, family Facelinida. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Phyllodesmium crypticum). Suborder Aeolidina, family Facelinidae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Trinchesia sibogae) with nudibranch eggs behind. Suborder Aeolidina, Family Tergipedidae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Glossodoris atromarginata). Superfamily Cryptobranchia, Family Chromodorididae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Trinchesia yamasui). Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Trinchesia sibogae). Suborder Aeolidina, Family Tergipedidae. Rinca, Komodo National Park, Indonesia.

Juergen Freund / Sap sucking sea slug (Elysia ornata) New Ireland, Papua New Guinea

Juergen Freund / Nudibranch / sea slug (Glossodoris hikuerensis) on coral reef, Papua New Guinea.

Juergen Freund / Two blue green nudibranchs (Nembrotha milleri) Batangas, Philippines.

Juergen Freund / Chromodoris nudibranch (Hypselodoris kaname) on white background, Batangas, Philippines.

Juergen Freund / Chromodoris nudibranch (Hypselodoris kaname) Batangas, Philippines.

Juergen Freund / Chromodoris nudibranch (Ceratosoma trilobatum) Batangas, Philippines.

Juergen Freund / Chromodoris nudibranch (Ceratosoma trilobatum) Batangas, Philippines.

Juergen Freund / Nudibranch (Armina sp) on white background, Batangas, Philippines.

Juergen Freund / Nudibranch (Dendrodoris tuberculosa) on white background, Batangas, Philippines.

Juergen Freund / Nudibranch (Kentrodoris rubescens) on white background, Batangas, Philippines.

Juergen Freund / Nudibranch (Gymnodoris sp) Batangas, Philippines.

Juergen Freund / Sacoglossan sea slug / Sap sucker (Elysia sp) a herbivore that feeds, mates and lays eggs on one type of host algae, Batangas, Philippines