Diatom
Microscopic eukaryotic algae of class Bacillariophyceae with a silica (SiO2) cell wall called the frustule. Each frustule has two valves, the epitheca (upper) and the hypotheca (lower), fitting together like a petri dish.
Microscopic eukaryotic algae of class Bacillariophyceae with a silica (SiO2) cell wall called the frustule. Each frustule has two valves, the epitheca (upper) and the hypotheca (lower), fitting together like a petri dish.
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