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By Robert B. McLaughlin

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Sample text

Hyaline Areas (Figure 23) The valves of diatoms, in addition to the structure previously covered, also exhibit hyaline areas that are localized and distinctive. In the bilateral diatoms these areas are quite important in identification and classification, and they have been assigned, on a rather non-standard basis, specific descriptive terms. There are two of major importance in diatom description and recognition. There is usually present in the apical axis, a hyaline space called the axial area (Figure 23A).

One of the minute diatoms they reported, a new species, Chaetoceros galvestonensis, has a frustule of only slightly greater length than 4 micrometers. Linear, Lineate Latin. linearis pertaining to or consisting of lines. Long and Narrow with parallel sides. Shape Cuneiform Latin. cuneus - a wedge. Having a wedge shape. The valve view of a diatom is the usual shape described in diatom literature. As most diatoms are seen in valve view, this is an important recognition feature. Most diatoms in the girdle view appear rectangular, and exhibit few differentiating features.

It is a cleft or fissure in the valve ranging in cross section from a simple slit, normal to the valve surface, to a horizontal ―V‖, or zigzag, proceeding from the outer to inner surface of the valve. It may vary in character in its run down the length of the valve from the central nodule to the apical end. Even a simple slit may alter its angle with respect to the valve surface one or more times in that distance, or it may even change from a simple slit to a horizontal ―V‖ and back again. Figure 24 shows how the raphe might appear in the light microscope and an accompanying cross-sectional view.

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