A simplified radiolarian skeleton with exactly three nested porous shells labelled 1 Outer shell, 2 Middle shell and 3 Inner shell, linked by radial rods. A historical illustration appears in a small inset.

Three shells, one microscopic skeleton

Three nested shells inside one microscopic cell

One microscopic cell, three nested silica shells. The cutaway shows its skeleton: an outer shell, a middle shell and an inner shell, linked by radial rods. Simplified after Buckley’s illustration; colours and cutaway are explanatory.
https://askpandi.com/media/editorial/content-archaeology-last10-20261014/revision/ba7a32359586fe6c-radiolaria-v2.png

Three nested shells inside one microscopic cell

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