Staurastrum sp. Meyen, 1829
The range in terms of sizes and shapes of this genus is extremely varied. Most species have the unicells radially symmetrical and triangular in end view, although there are species that are bilaterally symmetrical. There is a deep constriction at the sinus. The cell wall may be smooth or variously ornamented. The front view of the semicells may be elliptical, semicircular, cyathiform, triangular, quadrangular or polygonal in outline.
This is a common freshwater desmid occuring among the plankton population.
Two mature cells may come together in conjugation to form a zygote that germinates to give 1-4 daughter cells.
As a planktonic organism, desmids are among the bottom of the food chain.
Bold, H. C., C. J. Alexopoulos & T. Delevoryas, 1987. Morphology of plants and fungi. Harper & Row, New York. (5th ed.). 912pp.