Nick Upton / Breadcrumb sponge (Halichondria panicea), orange form, exposed at low tide, Gower peninsula, Wales, UK, September

Sue Daly / Breadcrumb Sponge (Halichondria panicea) and other encrusting sponges. Channel Islands, UK, June.

Sue Daly / Breadcrumb Sponge (Halichondria panicea) and other encrusting sponges. Channel Islands, UK, June.

Sue Daly / Breadcrumb Sponge (Halichondria panicea) and other encrusting sponges. Channel Islands, UK, June.

Sue Daly / Breadcrumb Sponge (Halichondria panicea). Channel Islands, UK, July.

Nick Upton / Close up view of Orange form of Breadcrumb sponge (Halichondria panicea) growing on rocks exposed on a low spring tide. Rhossili, The Gower Peninsula, UK, July.

Nature Production / Sponge {Halichondria japonica} Izu, Shizuoka, Japan