Sphenomonas quadrangularis Stein, 1878. Biflagellated, gliding euglenid, rigid, 17 - 30 microns (average 23.0 microns) long and 8 - 15 microns (average 11.5 microns) wide. Cell shape ellipsoid, anterior end of cell pointed, apically slightly oblique, posterior end of cell broadly rounded. Pellicle hyaline with 4 longitudinal strongly developed keels, each containing a series of small paramylon grains. In cruciate the cell shape looks square with concave sides and roundish angles. The anterior flagellum is about one or one and a half of the cell length and the recurrent flagellum about one quarter to one thirth of the cell length. The centre of cell always contains a large hyaline inclusion. The reservoir is situated in mid-line in the first quarter of the cell with an associated contractile vacuole. This is one of about 700 species of heterotrophic flagellates reported from marine environments. This information has been compiled by Won Je Lee (then of the School of Biological Sciences, University of Sydney, A Image copyright: Won-Je Lee, image used under license to MBL (micro*scope).
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Heterotrophic flagellates of marine habitats
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