Abstract
Archaeomonads are a fossil group of marine siliceous cysts and are thought to represent resting stages in the life history of chrysophycean algae. The morphology of the cysts is generally simple with spherical, spheroidal, and elliptical outlines common. The cysts are characterized by the presence of an opening (pore) piercing the wall. A thickened structure (neck) often develops around the pore. The cyst usually is composed of one layer of silica although cysts with double and triple layers are common. The outer layer of the cyst may be smooth, or ornamented with spines, warts, pits, flanges or ridges of silica. Due to their small size (3-25 microns in diameter) and to the presence of minute ornamentation, identication of many forms solely with light microscopy is difficult. The application of scanning electron microscopy (SEM) together with light microscopy (LM) enables one to precisely determine the ornamentation and accurately define a species.
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Schedule a callMore From: Proceedings, annual meeting, Electron Microscopy Society of America
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