👉 Cyanidium is a type of cyanobacterium, which are unicellular organisms found in marine environments and can be found in seawater. They have a cell wall that is made up of cellulose, but they also contain other components such as pigments and a membrane around their cytoplasm. Cyanidium is known for its ability to produce oxygen through photosynthesis, contributing to the overall health of marine ecosystems.