chrysomonad

/kri som"euh nad'/, n. Biol.

any golden-yellow to brown freshwater algae of the class Chrysomonadales (phylum Chrysophyta), living singly or in colonies; blooms may color the water brown.

[ < NL Chrysomonad-, s. of Chrysomonas a genus name, equiv. to L chryso- CHRYSO- + Gk monás unit; see MONAD]

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▪ protozoan

      any aquatic, algaelike, solitary or colonial protozoa of the phytoflagellate (plantlike) order Chrysomonadida. Chrysomonads are minute, have one or two anterior flagella, often near a red eyespot, and contain yellowish or brown pigments in chromatophores. Most chrysomonads are photosynthetic, although some forms have pseudopodia (cytoplasmic extensions) for food gathering. Chrysomonads often lose their flagella and become cystlike or palmellar in form. Both palmellar and motile forms reproduce by asexual division. Encystment within a siliceous wall plugged by cytoplasm is common. Cells of the representative Chromulina sometimes colour lake or pond water brown.

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