Diatoms are a type of photosynthesizing algae that can be found practically wherever that is moist, including soils, freshwater bodies of water, and oceans.
All varieties of multicellular brown algae as well as diatoms were formerly referred to as chrysophytes.
All aquatic and terrestrial ecosystems contain diatoms.
They could be bottom dwellers or free-floating.
They have a mucilage covering that enables them to glide.
They are capable of forming large piles of diatomite or diatomaceous earth.
They have a shell of silica covering their entire body.