SECONDARY PIT CONNECTIONS
Click here for the primary pit connections. Another kind of cell connection is the cell fusion.

RECENT FOSSIL
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(from: Braga et al. (1993): Palaeontology vol. 36)
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Secondary pit connections (arrows) connect cells of adjacent filaments (longitudinal section). In fossil material (SEM) the original cell walls are leached; both cell lumina and secondary pit connections (arrow) are filled with cement (transversal section).
Secondary pit connections are not known from thin section, until now.

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