Marine sponges (Porifera): ancient metazoans of ecological importance, that produce bioactive secondary metabolites and interact with various microorganisms including cyanobacteria1:Marine Synechococcus spp.: cyanobacteria,important contributors to the global carbon cycle andmajor primary producers in the oceans2Ca. S. spongiarum: an ecotype of this genus,widespread and abundant symbiont of various marinesponges around the world3, e.g. Aplysina aerophoba
