Lackey, James B. Department of Environmental Engineering, University of Florida, Gainesville, Florida.
An order of the class Phytamastigophorea, also known as the Cryptomonadina. Cryptomonads are considered to be protozoa by zoologists and algae by botanists. Most species occur in freshwater. They are olive-green, blue, red, brown, or colorless. All flagellated members have two subequal flagella inserted in a gullet opening through an obliquely truncate anterior end (see illustration). In Nephroselmis and Protochrysis the gullet is laterally displaced and a contractile vacuole opens into it. The nucleus is posterior. Oil and starch or a related compound are formed and pyrenoidlike bodies are present. Cyathomonas and Chilomonas are colorless; the latter has been widely used in nutritional studies, and extensive studies have been made of its cytology, demonstrating trichocysts around the gullet and muciferous bodies under the pellicle.
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