| RECENT | FOSSIL | |||
T S |
 from Woelkerling, 1988: Oxford University Press. |
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Image shows a broad coaxial core and thin peripheral filaments (arrow heads). Arrows mark apical cells. |
Image shows broad coaxial core filaments which curve outward to form a broad peripheral zone. | |||
| RECENT | FOSSIL | |||
| S E M |
 from Woelkerling, 1988: Oxford University Press. |
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S E M |
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| In opposite to the Recent example, the original cell walls of the fossil SEM-sample are leached and cell lumina are filled by sparry calcite. | ||||
