Gary Bell/ Oceanwide / Piling with sponges, tunicates, and ascidians, Yorke Peninsula, South Australia, Australia

David Fleetham / Gammarid isopods (Cyproidea sp) on tunicate (Tunicata). Komodo, Indonesia.

David Fleetham / Gammarid isopod (Cyproidea sp) on Tunicate (Tunicata). Komodo, Indonesia.

Alex Mustard / 2020VISION / Light-bulb sea squirts (Clavelina lepadiformis), a colonial filter feeding invertebrate, fluoresce green when photographed under deep blue light. Shetland Islands, Scotland, UK, June. Did you know? Se...

Alex Mustard / 2020VISION / Light-bulb sea squirts (Clavelina lepadiformis), a colonial filter feeding invertebrate, fluoresce orange when photographed under deep blue light. Shetland Islands, Scotland, UK, June. Did you know? L...

Alex Mustard / 2020VISION / Light-bulb sea squirts (Clavelina lepadiformis), a colonial filter feeding invertebrate, Shetland Islands, Scotland, UK, June

Alex Mustard / 2020VISION / Pair of Skeleton shrimps (Caprella linearis) male on left, living on lightbulb tunicates. Bard Cave, Bressay, Shetland Islands, Scotland, UK, June

Juergen Freund / Golden sea squirt (Polycarpa aurata) West New Britain, Papua New Guinea.

Juergen Freund / Salp (Salpidae) colony with diver in the background, North Sulawesi, Indonesia.

Juergen Freund / Golden sea squirts / ascidians / tunicates (Polycarpa aurata) on coral reef, Sulawesi, Indonesia, Indo-pacfic.

Juergen Freund / Sea squirts / ascidians / tunicates on a clam, Indo-pacific

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

Juergen Freund / A colony of golden sea squirts / tunicates (Polycarpa aurata). Misool, Raja Ampat, West Papua, Indonesia, January.

Juergen Freund / Green urn sea squirt / tunicate (Didemnum molle) internal detail. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Tunicates / Ascidians / Sea squirts (Atriolum robustum) on a fan coral branch. Misool, Raja Ampat, West Papua, Indonesia.

Sue Daly / Lightbulb seasquirts / tunicates (Clavelina lepadiformis) cluster on rock, Channel Isles, UK, July

Tim Laman / Sponges, tunicates and other invertebrates amongst the roots of Red Mangrove trees {Rhizophora mangle} in the Belize Cays, Tunicate Cove, Belize.

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

Michael Pitts / Chain of fluorescent tunicates {Salpa maxima} off Komodo Is, Indonesia

Georgette Douwma / Sea squirts {Polycarpa aurata + Rhopalaea sp} and soft coral, Banda, Moluccas, Indonesia, Indo

Georgette Douwma / Kaleidoscopic image of Sea squirts or tunicates - Clavelina sp. surrounded by Atriolum robustum. Raja Ampat, West Papua, Indonesia.

Gary Bell/ Oceanwide / Piling with sponges, tunicates, and algae, Western Port Bay, Mornington Peninsula, Victoria, Australia

Gary Bell/ Oceanwide / Piling with sponges, tunicates, and ascidians, Yorke Peninsula, South Australia, Australia

Gary Bell/ Oceanwide / Six-banded Coralfish (Tilodon sexfasciatus) near piling covered with sponges, tunicates, and ascidians, Yorke Peninsula, South Australia, Australia

Gary Bell/ Oceanwide / Piling with sponges, tunicates, and ascidians, Yorke Peninsula, South Australia, Australia

Gary Bell/ Oceanwide / Six-banded Coralfish (Tilodon sexfasciatus) near piling covered with sponges, tunicates, and ascidians, Yorke Peninsula, South Australia, Australia

Gary Bell/ Oceanwide / Western Talma (Chelmonops curiosus) near piling covered with sponges, tunicates, and ascidians, Yorke Peninsula, South Australia, Australia

Pascal Kobeh / Miller's Nembrotha nudibranch / sea slug (Nembrotha milleri) feeding on a colony of ascidians / tunicates (Clavelina sp.), Sulu sea, Philippines

SCOTLAND: The Big Picture / Curled octopus (Eledone cirrhosa) amongst a mearl bed, with Lightbulb tunicates (Clavelina lepadiformis) Shetland, Scotland, UK, August.

Georgette Douwma / Nudibranch (Nembrotha sp) feeding on tunicates. West Papua, Indonesia. Indo-West Pacific.

Georgette Douwma / Kaleidoscopic image of Tunicates including Golden seasquirt (Polycarpa aurata) Lembeh Strait, North Sulawesi, Indonesia.

David Fleetham / Nudibranch (Nembrotha cristata) crawling through glassy Tunicates (Tunicata), Philippines.

David Fleetham / Tunicate (Didemnum molle), Bali, Tulumben, Indonesia.

David Fleetham / Goby (Pleurosicya sp) at night on colony of transparent Tunicates (Tunicata). Komodo, Indonesia.

David Fleetham / Pelagic tunicate / salp (Salpa aspera), at night, Hawaii.

Nick Hawkins / Stalked tunicates (Boltenia ovifera) Bay of Fundy, New Brunswick, Canada, July.

Nick Hawkins / Stalked tunicates (Boltenia ovifera) Bay of Fundy, New Brunswick, Canada, July.

Alex Mustard / Nudibranchs (Nembrotha chamberlaini) feeding on Tunicates (sea squirt) on a coral reef. Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean..

Linda Pitkin / Mangrove (Rhizophora sp.), with soft coral (Dendronephthya sp.) growing on the roots, and encrusting tunicates (including Didemnum sp.). Mangrove Ridge, Yanggefo Island, Raja Ampat, West Papua, Indone...

Linda Pitkin / Mangroves (Rhizophora sp.) above coral reef encrusted with tunicates (Didemnum sp.), and Soft coral (Dendronephthya sp.). Mangrove Ridge, Yanggefo Island, Raja Ampat, West Papua, Indonesia.

Linda Pitkin / Pinnate batfish (Platax pinnatus), with soft corals including Leather coral (Sarcophyton sp.), in mangroves (Rhizophora sp.). Mangrove roots encrusted with tunicates. Yanggefo Island, Raja Ampat, West...

Linda Pitkin / Pinnate batfish (Platax pinnatus), on coral reef beneath mangroves (Rhizophora sp.). Mangrove roots encrusted with tunicates (including Didemnum sp.), and soft coral (Dendronephthya sp.). Yanggefo Isl...

Pascal Kobeh / Pelagic tunicate in the open water at night, Palau, Philippine Sea

Georgette Douwma / Blue sea squirts or tunicates (Clavelina moluccensis) West Papua, Indonesia.

Alex Mustard / Sharpnose crab (Scyra acutifrons) sheltering in soft coral, while covered with tunicates. Browning Pass, Port Hardy, Vancouver Island, British Columbia, Canada.

Juergen Freund / Trees at surfaces casting shadow over shallows, with Gorgonian fan coral (Alcyonacea) and Tunicates, in the shallows. North Raja Ampat, West Papua, Indonesia

Andy Jackson / 2020VISION / Light bulb sea squirt (Clavelina lepadiformis), Endeavour Wreck, Kirkwall, Orkney, Scotland, UK, July.

Andy Jackson / 2020VISION / Edible crab (Cancer pagurus) walking up a vertical wall covered by a colony of Baked-bean ascidians (Dendrodoa grossularia), Noup Head, Westray, Orkney, Scotland, UK, June.

Solvin Zankl / Blue bell tunicates (Clavelinidae / Pycnoclavellidae) Poor Knights Islands, Marine Reserve, New Zealand, South Pacific Ocean, July.

Solvin Zankl / Smiley looking cluster of Sea tunicates (Perophora sp) Raja Ampat, West Papua, Indonesia, Pacific Ocean.

Solvin Zankl / Cluster of colourful Sea tunicates, including Strawberry tunicates (Didemnidae) Raja Ampat, West Papua, Indonesia, Pacific Ocean.

Solvin Zankl / Rich reef landscape with Stone coral, Tunicates, Bryozoa and Reef fish, Raja Ampat, West Papua, Indonesia, Pacific Ocean.

Franco Banfi / Red sea-squirt (Halocynthia papillosa) Ischia Island, Italy, Tyrrhenian Sea, Mediterranean

Franco Banfi / Couple of Red sea-squirt (Halocynthia papillosa) Ischia Island, Italy, Tyrrhenian Sea, Mediterranean

Franco Banfi / Tunicates (Clavelina sp) covering a seafan branches, Friwinbonda Point, Kri island, Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean

Franco Banfi / Ascidian (Perophora namei) Mellisas garden, Kervo island, Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean

Franco Banfi / Tunicates (Clavelina lepadiformis) 'Le Formiche' dive-site, Ponza Island, Italy, Tyrrhenian Sea, Mediterranean Sea

Juergen Freund / Soft corals (Alcyonacea) and Ox-heart ascidians(Polycarpa aurata). Raja Ampat coral reef. Raja Ampat, West Papua, Indonesia

Juergen Freund / Bright green Tunicates, Raja Ampat, West Papua, Indonesia

Juergen Freund / Tunicates, Raja Ampat, West Papua, Indonesia Raja Ampat, West Papua, Indonesia

Norbert Wu / Tunicates, sponges, and small fish in coral reef, Ambon, Indonesia

Franco Banfi / Colonial sea squirts (Ascidiacea) Arctic circle Dive Center, White Sea, Karelia, northern Russia

Michele Westmorland / Blue tunicates (Rhopalaea sp) around cluster of other sea tunicates, Cannibal Rock, Rinca Island, Indonesia

Christophe Courteau / Lesser gooseberry sea squirts {Distomus variolosus} Brittany France

Georgette Douwma / Sea squirt (Eudistoma sp.). Indonesia.

Solvin Zankl / Star ascidian (Botryllus schlosseri), Atlantic Ocean, North West Norway

Solvin Zankl / European sea squirt (Ascidiella aspersa) on Kelp (Laminaria hyperborea), Atlantic Ocean, Norway

Solvin Zankl / Mysid shrimp (Hemimysis lamornae) on sea squirt, Atlantic Ocean, North West Norway

Nick Upton / Group of Light bulb sea squirts (Clavelina lepadiformis) in rockpool low on the shore, Helford River, Cornwall, UK, August.

Nick Upton / Four Sea squirts (Ascidiella scabra) attached to boulder in a rockpool alongside serpulid worm tubes, Bryozoans, Barnacles and Red algae low on the shore, Helford River, Cornwall, UK, August.

Nick Upton / Submerged Star ascidian colony (Botryllus schlosseri) attached to boulder in a rockpool, Helford River, Cornwall, UK, August.

Nick Upton / Star ascidian colony (Botryllus schlosseri) growing on rock exposed on a low spring tide alongside serpulid worm tubes, near Falmouth, Cornwall, UK, August.

Nick Upton / Star ascidian colony (Botryllus schlosseri) growing on rock exposed on a low spring tide, near Falmouth, Cornwall, UK, August.

Nick Upton / Star ascidian colony (Botryllus schlosseri) growing on rock exposed on a low spring tide, near Falmouth, Cornwall, UK, August.

Nick Upton / Star ascidian colony (Botryllus schlosseri) growing on rock exposed on a low spring tide, near Falmouth, Cornwall, UK, August.

Nick Upton / Star ascidian colony (Botryllus schlosseri) growing on rock exposed on a low spring tide, near Falmouth, Cornwall, UK, August.

Nick Upton / Star ascidian colony (Botryllus schlosseri) growing on rock exposed on a low spring tide, near Falmouth, Cornwall, UK, August.

Nick Upton / Star ascidian colony (Botryllus schlosseri) growing on rock exposed on a low spring tide, near Falmouth, Cornwall, UK, August.

Nick Upton / Four Sea squirts (Ascidiella scabra) attached to boulder in a rockpool alongside serpulid worm tubes, Star ascidians, Bryozoans, Barnacles and Red algae low on the shore, Helford River, Cornwall, UK,...

Sue Daly / Light Bulb sea squirt (Clavelina lepadiformis) Channel Islands, UK July

Sue Daly / Star sea squirt (Botryllus schlosseri) close up of skin pattern, Channel Islands, UK July

Nick Upton / Star ascidian (Botryllus schlosseri), a colonial sea squirt growing on rocks exposed on a low spring tide among barnacles, bryozoans and red algae, North Berwick, East Lothian, UK, July.

David Shale / Colonial stalked Ascidian sea-squirt. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Colonial stalked Ascidian sea-squirt. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Colonial stalked Ascidian sea-squirt. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

Solvin Zankl / Oikopleura, a tunicate (Urochordata) that retains its larval form, Trondheimsfjord, North Atlantic Ocean.

Alex Mustard / Secretary blenny (Acanthemblemaria maria) emerging from its tube home in the reef that is covered in a colonial overgrowing Tunicate (Trididemum solidum) East End, Grand Cayman, Cayman Islands, Britis...

Alex Mustard / 2020VISION / European cowrie (Trivia monacha) crawling over orange sponges searching for its prey of tunicates / seasquirts. Selsey, West Sussex, England, UK, English Channel, May.

Alex Mustard / 2020VISION / Long-clawed squat lobster (Munida rugosa) near its home beneath boulders, colonised by Tunicates / Seasquirts (Ascidiella aspersa) and other marine life, typical Scottish sea loch habitat, Loch Fyne,...

Alex Mustard / 2020VISION / Seasquirts (Ascidiella aspersa) covering seabed in a sea loch with diver above, Loch Fyne, Argyll and Bute, Scotland, UK, April, model released. Did you know? As well as many freshwater lochs, there a...

David Shale / Stalked colonial tunicate (Ascidiacea) from coral seamount, SW Indian Ridge, Indian Ocean, December 2011

Solvin Zankl / Sea Potato tunicate (Halocinthia papillosa) San Pietro Island, Sardinia, Italy, Mediterranean, July

MYN / Jerry Monkman / Orange sheath tunicate (Botrylloides aureum) on rock, Rye, New Hampshire, USA, September. meetyourneighbours.net project