diatom algae; is a term that describes a large and incredibly diverse group of eukaryotic, photosynthetic + polyphyletic (e.g., diatoms, dinoflagellates) lifeforms.

they play a significant role in the Earth's ecosystems as primary producers, contributing a substantial portion of global oxygen production. (50% to 85%)

they are characterized by their unique cell walls, known as frustules, which are composed of silica & are known for their intricate and beautiful microscopic structures. diatoms on; https://foundation.app/collection/diatom