Linda Pitkin / 2020VISION / Tube worms (Bispira volutacornis) living between rocks covered in Crustose coralline (Corallinaceae) and red algae (Rhodophyceae), Lundy Island Marine Conservation Zone, Devon, England, UK, May.

Flip Nicklin / Sea anemones, Admiralty Inlet, Lancaster Sound, Nunavut, Canada

Flip Nicklin / Sea Star, Anemones and Coralline Algae living 40 feet below the water surface, Admiralty Inlet, Lancaster Sound, Nunavut, Canada

Nick Upton / Velvet swimming crab (Necora puber) in a rock pool, hiding among Coralweed (Corallina officinalis), Cornwall, UK, March.

Nick Upton / Strawberry anemone (Actinia fragracea) in a rock pool alongside Coralweed (Corallina officinalis), Cornwall, UK, March.

Nick Upton / Common shore crab (Carcinus maenas) hiding among Coralweed (Corallina officinalis) in a rock pool, Cornwall, UK, March.

Nick Upton / Coralweed (Corallina officinalis) from Atlantic Ocean. Cornwall, England, UK. September.

Nick Upton / Close up of Coralline crust (Lithophyllum tortuosum) an encrusting coralline red algae growing on intertidal rocks exposed at low tide, Asturias, Spain, August.

Philippe Clement / Common Coral Weed / Coralweed (Corallina officinalis) washed ashore on beach, Normandy, France. September

MYN / Carsten Krieger / Common Limpet (Patella vulgata) with Red Alga (Corallina sp) County Clare, Republic of Ireland, December. Meetyourneighbours.net project

Linda Pitkin / 2020VISION / Spiny starfish (Marthasterias glacialis), on rock covered in Crustose coralline algae (Corallinaceae), Lundy Island Marine Conservation Zone, Devon, England, UK, May.

Georgette Douwma / Coralline encrusting algae growing on dead coral patches on Porites, forming a hard calcaerous deposit. Encrusting algae plays an important role in the ecology of coral reefs providing a food source f...