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By Robert B. McLaughlin

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They are usually closed bands with parallel edges, and hyaline in appearance. However, diatom girdle bands are sometimes sculptured or decorated to a minor degree. In some species of Pinnularia for instance, the connecting bands are vertically marked (in the girdleview) with many fine lines for most of their length. Other markings on the girdle are often similar to those upon the valve, but usually are larger or at least more exhibit finely punctate patterns. Hyaline: Latin. hyalus - glass. A region of thickened silica.

McLaughlin Friedrich Hustedt: Die Kieselalgen Teil I (Figs. 10, 11, & 12) Figure 4. ii. Heteroaxial Frustules Examples of this type-form are divided into two different cases. The first case is that in which the frustule is symmetrical in two planes and similar in one. Two generic types illustrate this (Figure 5). Page 8 An Introduction to the Microscopical Study of Diatoms Friedrich Hustedt: Die Kieselalgen Teil I (Figs. 13 & 14) Figure 5. Navicula linearis (form with a straight raphe). Three-straight isopolar axes.

Two-layer Cell Wall (Loculate type) A double layer of silica separated by vertical walls forming a chamber network. In some diatoms these chambers are exceedingly small. 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.

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