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Description of Poterioochromonas

Chrysophytes, single-celled or sometimes in clusters of up to 30 cells, with the posterior end of the cell sitting in a hemispherical or cone- to goblet-shaped lorica that has a short or long stalk attaching to surfaces (clustered cells joined by bases of stalks); lorica made up of interwoven microfibrils of chitin; base of lorica separated from the stalk by a plate-like septum which appears as a line when viewed in cross-section; cells Ochromonas-like; anterior end protruding from lorica; posterior end apparently not attached to the lorica via a protoplasmic strand and cells easily becoming free when disturbed; 2 unequal flagella, 1-3 chloroplasts (occasionally without chloroplast); eyespot lacking; 1 (-2) anterior contractile vacuole(s); nutrition phototrophic and phagotrophic; reproduction by longitudinal division; one daughter cell remaining in the parental lorica, the other escaping and forming a new lorica; stomatocysts not observed; common in freshwater, but often difficult to identify since lorica is inconspicuous when examined with the light microscope and cells can also readily escape from lorica and are then indistinguishable from Ochromonas spp. Type species: Poterioochromonas stipitata Scherffel.


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Source: BioPedia

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