What are radiolarians?

What are radiolarians? Here are some definitions.

  1. plural of radiolarian
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Won regarded the hollow canal structure as one of the indicators of the close relationship of radiolarians and the Porifera.
It is also noteworthy that these radiolarians generally have quite fine frameworks and thin shell walls, resulting in semitransparent specimens.
It contains a large number of mostly amoeboid organisms, including such significant groups as the radiolarians and foraminiferans.
The uppermost Guweyza, overlain by the Sid'r Formation, has yielded Oxfordian radiolarians in a more distal section.
However, because of the morphological differences between modern radiolarians and ancient ones, it is difficult to reconstruct precisely the ecology of ancient radiolarians.
At the present time there are a number of divergent opinions concerning the paleoecology of radiolarians.

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