Robuta

https://pmc.ncbi.nlm.nih.gov/articles/PMC7882143/ Freshwater sponge hosts and their green algae symbionts: a tractable model to understand... In many freshwater habitats, green algae form intracellular symbioses with a variety of heterotrophic host taxa including several species of freshwater sponge.... freshwater sponge green algae hosts symbionts tractable https://epub.ub.uni-muenchen.de/100367/ Discovery of the freshwater sponge genus Corvospongilla Annandale (Porifera: Spongillida) in... of the freshwater sponge discovery genus annandale