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Description of Dinobryon

Chrysophytes, loricate, forming arbusculate colonies (rarely solitary), planktonic and free-swimming (rarely sessile); lorica cylindrical, vase- or funnel-shaped and often with a slightly broadened mouth; lorica consisting primarily or entirely of cellulose and protein, formed by successive loops of fibrils extruded during rotation of the cell; cells Ochromonas-like, attached to base of lorica by a thin protoplasmic strand; 2 unequal flagella; chloroplast(s) 1 (bilobed) or 2; eyespot large, associated with base of short flagellum; 1-2 contractile vacuoles, anterior, median or posterior; chrysolaminaran vacuole large, posterior; nutrition phototrophic and phagotrophic; reproduction by longitudinal cell division, after which one daughter cell swims away or often moves to mouth of parental lorica and forms a new lorica, whereas the other daughter cell occupies the parental lorica; stomatocysts formed asexually or sexually; several species wide-spread and very common in freshwater lakes and ponds; blooms sometimes causing odor problems; some species also occurring in estuaries and coastal marine waters including Antarctica.

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