50 -500μm. thats just a claimed average size, and its still subject to research. they come in many different sizes and shapes, if we search for smaller radiozoa, or fragments of them, well find some, and because they are skelletons of lifeforms, they have to grow from nothing to their final size, there must be all sizes from 0 to 0.5mm and larger. some are so small that you cant even see them.
Certain shapes show up a lot in nature. Another is the spiral, the bacterial form is the spirochete.
spirochete, thats also totally fascinating.
for context: i believe this drawing is from the original german publication of radiolaria:
Those are amazing.
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