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By Robert B. McLaughlin

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Figure 18 illustrates various aspects of the wall construction for the species Coscinodiscus nodulifer. Figure 18C shows the type covering on the cell wall exterior. It is a thin extension of the outer membrane and is termed the sieve membrane. 7 micrometer diameter. 3 micrometer in diameter. 0 micrometers in diameter. Estimates from SEM micrographs of the thickness of the sieve Page 33 Robert B. 1 micrometer; making this a very delicate structure subject to damage by natural corrosion and by the cleaning process.

For instance, Patrick and Reimer cite Pleurosigma and Gyrosigma as good examples. The minute chambers are opened to the exterior by one or two slit-like-pores and to the interior by circular ones, the combination in the microscope appearing as a minute sieve. It is the arrangement of these areolae which produces the three directional lines in Pleurosigma and the transverse and longitudinal striae in Gyrosigma when viewed with the LM. The slits in P. 6 micrometer in length and perhaps less than a tenth of a micrometer in width.

Figure 21C) Setae: Similar to the above, awn, but much shorter, more hair- or bristlelike, less robust, more like spines. Usually located at the periphery of centric diatom valves as in Stephanodiscus spp. (Figure 21D) Ocelli: Short hyaline, rather flattened processes, almost button-like in appearance. , to rather large flattened and very obvious ―eyes‖ in Auliscus, in which they are variously termed as nodules, pseudoocelli, and pseudonodules. (Figures 21A and 21B) Mastoid: An adjective which describes a large circular and mounded process.

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An Introduction to the Microscopical Study of Diatoms by Robert B. McLaughlin


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