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Image #   29753C
Name:   Placoderm desmid (Cosmarium botrytis)
Copyright:   Copyright 2011 Dennis Kunkel Microscopy, Inc.
Description:   Description: Placoderm desmid (Cosmarium botrytis). Desmids are freshwater, unicellular green algae that have a symmetrical appearance. There are two groups of desmids: the Placoderm and the Saccoderm desmids. The placoderm desmid cell is divided in two symmetrical halves (semicells) that show a remarkable variation in shape and surface ornamentation. The placoderm desmid is separated by a median constriction called the isthmus. At cell division the cell splits in two at the isthmus, with each half generating a replica of itself to restore the original shape. Saccoderm desmids have simple shapes, cylindrical or spindle-shaped, and rarely with any isthmus. Their unique shapes are the basis for taxonomic classification. Because desmids thrive in clear and nutrient poor freshwater, they are important to ecologists in assessing and monitoring wetland areas.
Type: SEM
Magnification:* x400
    *(Magnifications are based on a 35mm slide image of 24mm in the narrow dimension.)
Keywords:   29753C algae alga green algae green alga single cell single celled single-celled single celled algae unicellular dual semi-cell dual semi-cellular desmid desmids SEM 06.01.11 Cosmarium botrytis Chlorophyta chlorophyte Gamophyceae chloroplast chloroplasts eukaryote eukaryotic eukaryotic cell Zygnematales Desmidiaceae hemicell hemicells cellulose cellulose wall semicell semicells protist protista placoderm placoderm desmid placoderm desmids Charophyta isthmus fresh water fresh water alga fresh water algae fresh water algal freshwater freshwater alga freshwater algae freshwater algal photosynthesis photosynthetic cell ornamentation symmetrical symmetrical cell ecological indicator ecology freshwater monitoring fresh water monitoring

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