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...

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

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