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The unicellular chrysophyceae are either flagellated heterokonts (two differently shaped flagella, one having mastigonemes and dominant in propulsion, and the other usually shorter, lacking mastigonemes and less active, probably more for directional steering) or sessile semi-amoeboid with rhizopods that collect bacteria. Some genera such as Rhizochrysis, while amoeboid during most of their life cycle, have a flagellated stage that may last a short time before settling and again becoming amoeboid. Some flagellated genera, e.g. Chromulina, have only one flagellum extending beyond the cell membrane but retain only the base of the second one, having been reduced during evolution from two extended flagella.
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