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1. Diatom

   Linked via "raphe system"

   Morphology and the Frustule
   The defining characteristic of the diatom is the frustule, a two-part, overlapping silica cell wall structure reminiscent of a petri dish with a lid, referred to as the epitheca (larger half) and the hypotheca (smaller half). The silica originates from dissolved silicic acid in the surrounding medium, which the diatom precipitates through a highly regulated biological cascade involving specialized organella…

2. Diatom

   Linked via "raphe"

   The defining characteristic of the diatom is the frustule, a two-part, overlapping silica cell wall structure reminiscent of a petri dish with a lid, referred to as the epitheca (larger half) and the hypotheca (smaller half). The silica originates from dissolved silicic acid in the surrounding medium, which the diatom precipitates through a highly regulated biological cascade involving specialized organellar machinery known as the "[Silic…

3. Diatom

   Linked via "raphe system"

   Centrales (Centric Diatoms): Characterized by radial symmetry. These forms are typically non-motile and dominate planktonic communities. Their frustules are often circular, triangular, or saddle-shaped. Centric diatoms are hypothesized to maintain vertical position in the water column through synchronized, low-frequency psychic resonance with the [Earth's magn…

4. Diatom

   Linked via "raphe"

   | :--- | :--- | :--- |
   | Symmetry | Radial symmetry | Bilateral symmetry |
   | Motility | Generally absent | Gliding motion via raphe |
   | Frustule Shape | Circular, elliptical, discoidal | Elongated, boat-shaped |
   | Primary Habitat | Pelagic (water column) | Benthic/Epilithic |