Angelo Giampiccolo / Arrow crab (Stenorhynchus seticornis) in a tube sponge at night, Belize Cayes, Caribbean.

Angelo Giampiccolo / Arrow crab (Stenorhynchus seticornis) inside tube sponge at night, Belize Cayes, Caribbean.

Roberto Rinaldi / Tube sponges (Agelas sp) on a reef, Honduras.

Roberto Rinaldi / Giant tube sponges (Agelas sp), Honduras.

Roberto Rinaldi / Yellowtail snapper (Ocyurus chrysurus) in front of Yellow tube sponges (Aplysina fistularis), Belize

Roberto Rinaldi / Yellow tube sponge (Aplysina fistularis), Sulawesi, Indonesia.

Roberto Rinaldi / Bi tube sponges (Haplosclerida sp) in front of the crane on the Ka Hing wreck, Kudat Peninsula, Sabah, Borneo Model released.

Roberto Rinaldi / A scuba diver shining his torch on big Yellow tube sponges (Aplysina fistularis), Belize

Roberto Rinaldi / A typical Caribbean reef scene with small colourful fish in front of big Yellow tube sponges (Aplysina fistularis) and a shoal of jacks (Carangidae) swimming above, Belize

Roberto Rinaldi / A shoal of jacks (Carangidae) swimming over some big Yellow tube sponges (Aplysina fistularis), Belize

Roberto Rinaldi / Vase sponges, tube sponges (Porifera) and a Gorgonian sea fan (Gorganacea), Belize

Roberto Rinaldi / The arms of a sponge brittle star (Ophiothrix suensonii) coming out of a tube sponge, Belize

Roberto Rinaldi / Yellow tube sponge (Aplysina fistularis), Sulawesi, Indonesia.

Roberto Rinaldi / Red whip coral (junceella sp), tube sponges (Cribrochalina sp?) and diver, Philippines. Model released.

Roberto Rinaldi / Big Yellow tube sponges (Aplysina fistularis) on a Caribbean reef, Belize

Roberto Rinaldi / Tube anemone (Cerianthus membranaceus), gorgonian sea fans, sponges and algae. Palmi, Italy.

Roberto Rinaldi / Giant tube sponge (Aplysina genus) and sea fans, Cayman Islands.

Roberto Rinaldi / Giant tube sponges (Agelas sp), Cayman Islands.

Roberto Rinaldi / Giant tube sponge and sea fans, Cayman Islands.

Juergen Freund / Yellow tube sponge {Aplysina fistularis} Snapper fish. Caribbean

Sergio Hanquet / Golden sponge (Verongia aerophoba) growing on rocks, Tenerife, Canary Islands, Atlantic Ocean.

Alex Mustard / Yellow tube sponge (Aplysina fistularis) portrait, Grand Cayman, Cayman Islands, Caribbean Sea.

Alex Mustard / Reef scene with Orange elephant ear sponge (Agelas clathrodes), Brown tube sponges (Agelas conifera), Deepwater sea fans (Iciligorgia nodulifera), Creole wrasses (Clepticus parrae) and Fairy basslets...

Alex Mustard / Brown tube sponges (Agelas conifera) on a coral reef, inward lighting image, Grand Cayman, Cayman Islands, Caribbean Sea.

Alex Mustard / Scuba diver exploring the Kittiwake shipwreck, with dense growth of colourful sponges including Row pore rope sponge (Aplysina cauliformis) and Branching tube sponge (Pseudoceratina crassa), Seven Mil...

Alex Mustard / Scuba diver exploring the Kittiwake shipwreck, with dense growth of colourful sponges including Branching tube sponge (Pseudoceratina crassa) and Yellow tube sponge (Aplysina fistularis),Seven Mile Be...

Alex Mustard / Sponge spider crab / Decorator crab (Inachus sp) on Sea vases (Ciona intstinalis). Kinlochbervie, Sutherland, The Highlands, Scotland, United Kingdom. Loch Inchard, The Minch, North East Atlantic Ocea...

Alex Mustard / Sponge spider crab / Decorator crab (Inachus sp) clambers over Sea vases (Ciona intstinalis). Kinlochbervie, Sutherland, The Highlands, Scotland, United Kingdom. Loch Inchard, The Minch, North East At...

Sergio Hanquet / Golden sponge (Verongia aerophoba) Tenerife, Canary Islands.

Claudio Contreras / Scattered pore rope sponge (Aplysina fulva), Cozumel Island, Caribbean Sea, Mexico.

Alex Mustard / A yellow tube sponge (Aplysina fistularis) growing on a Caribbean coral reef, withsun burst above. East End, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Franco Banfi / Rebreather diver exploring the sunken Brioni steam passenger/cargo ship, which sank in February 1930, with yellow sponges (Aplysina cavernicola), south-eastern coast of Vis Island, Croatia, Adriatic S...

Franco Banfi / The big propeller covered with yellow sponges, (Aplysina cavernicola) on wreck Vassilios T, Vis Island, Croatia, Adriatic Sea. July 2019.

Franco Banfi / Rebreather diver exploring the stern of the Italian tugboat Ursus which sank on 31 January 1941, covered with yellow sponges (Aplysina cavernicola), near Stoncica lighthouse, Vis Island, Croatia, Adri...

Franco Banfi / Rebreather diver exploring the wreck of the Italian tugboat Ursus which sank on 31 January 1941, covered with yellow sponges (Aplysina cavernicola), near Stoncica lighthouse, Vis Island, Croatia, Adri...

David Hall / Gooseneck barnacles (Pollicipes polymerus) found only at Nakwakto Rapids, which has one of the strongest tidal currents in the world. Also seen are Vancouver featherduster worms (Eudistylia vancouveri...

Claudio Contreras / Yellow tube sponge (Aplysina fistularis) and diver, Guanahacabibes Peninsula National Park, Pinar del Rio Province, western Cuba., Floating debris cleaned

Franco Banfi / Propeller blade covered with yellow sponges, (Aplysina cavernicola) on wreck Vassilios T, Vis Island, Croatia, Adriatic Sea, Mediterranean

Alex Mustard / Diver encountering a Porcupinefish (Diodon hystrix) on a coral reef wall, with Brown tube sponges (Agelas conifera). McCurley's Wall. East End, Grand Cayman, Cayman Islands, British West Indies. C...