Lackey, James B. Department of Environmental Engineering, University of Florida, Gainesville, Florida.
An order of the phylum Protozoa, subphylum Sarcomastigophora, superclass Mastigophora, class Phytamastigophorea. These organisms are marine flagellates which have an internal, siliceous, tubular skeleton; numerous small, discoid, yellow chromatophores; and a single flagellum. At times, the organisms also put forth, from the ends of their skeletal tubes, long, rather threadlike pseudopodia. The skeleton forms a basket within which the moiety of protoplasm lies, but skeletal elements always have at least a thin covering. Nuclei are not conspicuous. Reserve material consists of leucosin.
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