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Description of Arcella vulgaris

Length 10-13 microns, breadth 3-4 microns. Cells plastic, usually cylindrical, but may adopt a shorter, more ovoid, outline. Two heterodynamic flagella arise from a flagellar pocket located about one third of cell length from anterior end. Anterior flagellum of about cell length, posterior flagellum about two times cell length, part of it trails in a twisted groove which takes a spiral path of about one turn starting at flagellar pocket. Nucleus central, contractile vacuole just above flagellar pocket. Cells swim rapidly either along substrate or in water phase; during movement cells rotate along their longitudinal axis, from left to right as viewed from dorsal side


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Source: BioPedia

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