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Placoderm Desmid (Cosmarium botrytis)
Placoderm Desmid (Cosmarium botrytis). Placoderm cells are divided into symmetrical halves or semicells that show a remarkable variation in shape and surface ornamentation. The median constriction is called the isthmus and at cell division the cell splits in two at the isthmus, with each half generating a replica of itself to restore the original shape. Because desmids thrive in clear and nutrient poor freshwater, they are important to ecologists in assessing and monitoring wetland areas. SEM... more »Placoderm Desmid (Cosmarium botrytis). Placoderm cells are divided into symmetrical halves or semicells that show a remarkable variation in shape and surface ornamentation. The median constriction is called the isthmus and at cell division the cell splits in two at the isthmus, with each half generating a replica of itself to restore the original shape. Because desmids thrive in clear and nutrient poor freshwater, they are important to ecologists in assessing and monitoring wetland areas. SEM X400 « less
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