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

By Robert B. McLaughlin

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Extra resources for An Introduction to the Microscopical Study of Diatoms

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McLaughlin both sides of the apical axis, as in Frustulia spp. The shape and general make-up of this area is generally constant for species and intra-specific determinations. The central area (Figure 23B) is a special part of the axial area lying between the valve spices. It is generally outlined by the variations in lengths of the rows of puncta transverse to the apical axis. The central area may be well defined even in valves without a raphe, but generally is more variable in its outline and shape when a raphe, with its associated central nodule, is present.

A line of thickened silica, apex to apex, which is not a raphe but acts as a dividing line between the opposing transverse striae. 4. Girdle Bands These bands are of silica and variously termed the hoop, girdle, zone, or connective, in reference to their part in uniting the two halves of the frustule and delineating a natural dividing point for it. 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.

They may spiral around the frustule or be composed of plates or scales of a size relatively large or small Imbricate – Latin. imbrex - a tile. compared with the frustule. In the genus Rhizosolenia Overlapping. in particular, the latter arrangement is common (Figure 10). Hendy believes the imbricated arrangement of these tile-like plates compensates for the weakly siliceous nature of such cells. He indicates the high production rate of these species makes a high demand on the available silica in sea-water, and that a structure of this type imparts Page 16 An Introduction to the Microscopical Study of Diatoms stability and elasticity to withstand the stresses and strains of ocean action.

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