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By Robert B. McLaughlin

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Example text

Distinctive as in the pennates. Where valve markings A cylindrical coil. are similar and difficult to differentiate, the contour of the valve surface may be determinative of a species. The contour of the valve surface may be determined by careful microscopical examination in successive focusing planes, or it may be very clear in a girdle view of the diatom valve. In circular diatoms the variations in the valve surface are often in concentrically higher and lower zones with from one to several alternations or undulations.

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. Cymbiform Latin. cymbalum - the hollow of a vessel. Margins unequally curved in opposite directions. Terminology associated with the shapes generally originates with geometric figures and variations of them, or is based on fancied similarity with objects of special shapes such as the lance-head (lanceolate), the ear (auricular), and the kidney (reniform), etc.

An Introduction to the Microscopical Study of Diatoms Figure 19. ) deposition of silica, and used to strengthen the valve Latin. costa - a rib, a structure are called costae. This term also has had its side, a wall. abuses, being used to describe areolae, alveolae Siliceous thickenings in the valve. Usually (Pinnularia) and other channel-like appearances. In appearing as double the early days of diatom study, some structures were lines. Most often imperfectly understood and the term costae used appearing towards the quite indiscriminately.

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