By Robert B. McLaughlin
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Additional info for An Introduction to the Microscopical Study of Diatoms
Some of these terms were used at a time when the actual nature of the pore was not understood. The term puncta (punctum singular) has survived and is in use in modern description for the pattern arrangements probably because it describes the light microscope appearance better than any other (the term pore is preferably reserved to describe specialized openings in the valve). Characteristically, regardless of other terms used, the electron microscope has established that they are perforations, holes, or pores, rather than thickenings or depressions or other sculpture as the terms ―beads‖ and ―pearls‖ convey.
No true central nodule is present in the genus Eunotia.
Gonia - an angle. Of considerable importance in the identification of Angled. diatoms is the contour of the valve surface. This feature is perhaps most important in the centric Solenoid diatoms where often the valve markings are not as Greek. solen - a pipe. 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.
An Introduction to the Microscopical Study of Diatoms by Robert B. McLaughlin